<html><head><meta http-equiv="Content-Type" content="text/html; charset=utf-8"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; line-break: after-white-space;" class="">Hi Juan,<div class=""><br class=""></div><div class="">Thanks for the detailed response — and more insight into the “Smalltalk Philosophy.” That helps a lot.</div><div class="">(As I mentioned in another post: Chapter 9 — Code Management (<a href="https://cuis-smalltalk.github.io/TheCuisBook/Code-Management.html" class="">https://cuis-smalltalk.github.io/TheCuisBook/Code-Management.html</a>) cleared up some things)</div><div class=""><br class=""></div><div class="">At least knowing that freezing up cuis and relaunching is part of the “growing pains”, is a good thing. :-)</div><div class=""><br class=""></div><div class="">It would be nice if there were a way as simple as “World (menu)” > “Save Image” to save the current state without “mucking” up the “core” of Smalltalk.</div><div class="">However, I realize as I type that, that that is not “The (Smalltalk) Way” 🙂</div><div class=""><br class=""></div><div class="">Here are some more observations.</div><div class=""><br class=""></div><div class="">OBSERVATION #1</div><div class=""><br class=""></div><div class=""><div class="">I did create a “startup script” to setup the environment, which is great — but, it has its own issue. I’ve included the following (based on the sample), and I would expect the “Welcome to Cuis” window to be closed when it receives the “delete” message … but, it’s still there, along with a “Transcript” window showing that the package “Theme-Themes” was successfully installed.</div></div><div class=""><br class=""></div><blockquote style="margin: 0 0 0 40px; border: none; padding: 0px;" class=""><div class="">| list morph area extent |<br class=""><br class="">"------------------------------------------------------"<br class="">"Delete all windows but the taskbar"<br class="">"------------------------------------------------------"<br class="">list := UISupervisor ui submorphs reject: [:aMorph |<br class=""> aMorph is: #TaskbarMorph].<br class="">list do: [:each | each delete].<br class=""><br class=""></div></blockquote><div class=""><br class=""></div><div class="">OBSERVATION #1.1</div><div class=""><br class=""></div><div class="">(Along the lines of the above observation)I have noticed that when I instantiate some morphs from the Workspace, they sometimes cannot be deleted with a “delete.”</div><div class="">What I observe is that they <i class="">do</i><span style="font-style: normal;" class=""> </span>disappear off the world/screen, but when I send “allInstances size.”, the response is not “0”, which is what I’d expect.</div><div class=""><br class=""></div><div class="">Is this a case where memory garbage collection hasn’t run yet?</div><div class="">When does that get triggered?</div><div class="">Is there a way to initiate garbage collection to see verify instances are removed after that?</div><div class=""><br class=""></div><div class="">OBSERVATION #2</div><div class=""><br class=""></div><div class="">If the “preferred” mode of development is to not save the image, but rather use packages, then I’ve noticed that the “Change Sorter” doesn’t always show all the changes reflected in “*.changes” files.</div><div class=""><br class=""></div><div class="">I see changes files with names like:</div><div class=""><br class=""></div><blockquote style="margin: 0 0 0 40px; border: none; padding: 0px;" class=""><div class=""><div class="">Are these “original/downloaded” change files?</div><div class=""><span class="Apple-tab-span" style="white-space:pre"> </span>Cuis5.0-4963-v3.changes</div></div><div class=""><div class=""><span class="Apple-tab-span" style="white-space:pre"> </span>Cuis5.0-4963.changes</div></div><div class=""><div class=""><br class=""></div></div><div class="">Are these created after I entered my initials?</div><div class=""><div class=""><span class="Apple-tab-span" style="white-space:pre"> </span>Cuis5.0-4963-mdj.changes</div></div><div class=""><div class=""><span class="Apple-tab-span" style="white-space:pre"> </span>Cuis5.0-4963-mdj.user.nnn.changes</div></div><div class=""><div class=""><span class="Apple-tab-span" style="white-space:pre"> </span>Cuis5.0-4963-mdj.user.changes</div></div><div class=""><div class=""><br class=""></div><div class="">Are these created <b class="">before</b> my initials are known to the system?</div><div class=""><span class="Apple-tab-span" style="white-space:pre"> </span>Cuis5.0-4963.user.nnn.changes</div></div><div class=""><div class=""><span class="Apple-tab-span" style="white-space:pre"> </span>Cuis5.0-4963.user.changes</div></div></blockquote><div class=""><br class=""></div><div class="">When I open the “Change Sorter”, it only shows:</div><div class=""><span class="Apple-tab-span" style="white-space:pre"> </span>"4964-CuisCore-AuthorName-2021Nov16-09h29m”</div><div class=""><span class="Apple-tab-span" style="white-space:pre"> </span>“Install-Theme-Themes”</div><div class=""><br class=""></div><div class="">Which do not <i class="">obviously</i> (to me! 😉) correspond to the filenames.</div><div class=""><br class=""></div><div class="">Again, probably n00b issues that will make more sense over time. 🙂</div><div class=""><br class=""></div><div class="">Thanks,</div><div class=""><br class=""></div><div class=""><span class="Apple-tab-span" style="white-space:pre"> </span>— Mark<br class=""><div><br class=""><blockquote type="cite" class=""><div class="">On Nov 16, 2021, at 6:20 AM, Juan Vuletich via Cuis-dev <<a href="mailto:cuis-dev@lists.cuis.st" class="">cuis-dev@lists.cuis.st</a>> wrote:</div><br class="Apple-interchange-newline"><div class=""><span style="caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; background-color: rgb(255, 255, 255); text-decoration: none; float: none; display: inline !important;" class="">Hi Mark,</span><br style="caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; background-color: rgb(255, 255, 255); text-decoration: none;" class=""><br style="caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; background-color: rgb(255, 255, 255); text-decoration: none;" class=""><span style="caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; background-color: rgb(255, 255, 255); text-decoration: none; float: none; display: inline !important;" class="">On 11/13/2021 7:17 PM, Mark via Cuis-dev wrote:</span><blockquote cite="mid:4F0725DF-4D49-49AE-89E4-477B16397AB2@virtualmdj.com" type="cite" style="font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px; background-color: rgb(255, 255, 255); text-decoration: none;" class="">Hi,<div class=""><br class=""></div><div class="">I’m new to the Cuis implementation of Smalltalk.</div><div class="">I’ve dabbled with Squeak and Pharo in the past … and then life would strike and distract me from it. :-)</div></blockquote><br style="caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; background-color: rgb(255, 255, 255); text-decoration: none;" class=""><span style="caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; background-color: rgb(255, 255, 255); text-decoration: none; float: none; display: inline !important;" class="">Welcome!</span><br style="caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; background-color: rgb(255, 255, 255); text-decoration: none;" class=""><br style="caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; background-color: rgb(255, 255, 255); text-decoration: none;" class=""><blockquote cite="mid:4F0725DF-4D49-49AE-89E4-477B16397AB2@virtualmdj.com" type="cite" style="font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px; background-color: rgb(255, 255, 255); text-decoration: none;" class=""><div class="">Now, I’m playing with Cuis — and I really like the minimalist approach.</div><div class=""><br class=""></div><blockquote class="" style="margin: 0pt 0pt 0pt 40px; border: medium none; padding: 0px;"><div class="">System: MacBook Pro 16” (2019)</div><div class="">OS: macOS Catalina (10.15.7)</div><div class="">Cuis image: Cuis5.0-4963.image</div></blockquote><div class=""><br class=""></div><div class="">I’ve been working my way through “The Cuis” book (<a moz-do-not-send="true" href="https://cuis-smalltalk.github.io/TheCuisBook/" class="">https://cuis-smalltalk.github.io/TheCuisBook/</a>), learning lots.</div></blockquote><br style="caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; background-color: rgb(255, 255, 255); text-decoration: none;" class=""><span style="caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; background-color: rgb(255, 255, 255); text-decoration: none; float: none; display: inline !important;" class="">Cool.</span><br style="caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; background-color: rgb(255, 255, 255); text-decoration: none;" class=""><br style="caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; background-color: rgb(255, 255, 255); text-decoration: none;" class=""><blockquote cite="mid:4F0725DF-4D49-49AE-89E4-477B16397AB2@virtualmdj.com" type="cite" style="font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px; background-color: rgb(255, 255, 255); text-decoration: none;" class=""><div class="">It’s all been running quite stable until today and have run into two issues.</div><div class=""><br class=""></div><div class="">(I did DuckDuckGo around to find similar issues, but I didn’t find any. If these are noted somewhere, please point me to them. Thanks! 🙂)</div><div class=""><br class=""></div><div class="">ISSUE #1</div><div class=""><br class=""></div><div class="">I got to the clock morph chapter (<a moz-do-not-send="true" href="https://cuis-smalltalk.github.io/TheCuisBook/A-Clock-Morph.html" class="">https://cuis-smalltalk.github.io/TheCuisBook/A-Clock-Morph.html</a>) and got the clock running.</div><div class=""><br class=""></div><div class="">Then, I started playing with the #stepTime values — just for fun. I set it to values like “16” and “66.7” and then, suddenly, the whole environment froze.</div><div class=""><br class=""></div><div class="">The Squeak menu still responded, but it wouldn’t allow me to quit.</div><div class=""><br class=""></div><div class="">I sent it a USR1 signal, and it generated a crash dump, here: <a moz-do-not-send="true" href="https://www.dropbox.com/s/1e4st9fp8xrm29p/crash-01.dmp?dl=0" class="">https://www.dropbox.com/s/1e4st9fp8xrm29p/crash-01.dmp?dl=0</a></div><div class=""><br class=""></div><div class="">Is this a known issue? I realize a step time of 16ms (or possibly even 67.7ms) is pretty short, but I didn’t expect it to freeze everything.</div><div class="">(Sadly, I hadn’t saved the image, so I lost all the samples I’d added. :-( )</div><div class=""><br class=""></div></blockquote><br style="caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; background-color: rgb(255, 255, 255); text-decoration: none;" class=""><span style="caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; background-color: rgb(255, 255, 255); text-decoration: none; float: none; display: inline !important;" class="">The problem is not the #stepTime being too small (you can answer zero, and it will do as many fps as your hardware allows). The problem is that the system assumed it would always be an integer number. I just posted to GitHub an update to truncate to integer otherwise. Good catch!</span><br style="caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; background-color: rgb(255, 255, 255); text-decoration: none;" class=""><br style="caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; background-color: rgb(255, 255, 255); text-decoration: none;" class=""><blockquote cite="mid:4F0725DF-4D49-49AE-89E4-477B16397AB2@virtualmdj.com" type="cite" style="font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px; background-color: rgb(255, 255, 255); text-decoration: none;" class=""><div class="">ISSUE #2</div><div class="">After restarting Cuis, I re-added the LineExampleMorph (section 7.1.1 - <a moz-do-not-send="true" href="https://cuis-smalltalk.github.io/TheCuisBook/Going-Vector.html" class="">https://cuis-smalltalk.github.io/TheCuisBook/Going-Vector.html</a>)</div><div class="">And instantiated it.</div><div class="">It drew a green line.</div><div class=""><br class=""></div><div class="">Then, I went to the class definition and changed its superclass from Morph to MovableMorph and saved.</div><div class=""><br class=""></div><div class="">Everything seems fine … but, when I clicked on the existing green line, the debugger popped up</div><div class=""><br class=""></div><div class="">So, I closed the debug window and went to the Workspace window and executed “LineExampleMorph allInstancesDo: [:x | x delete. ]”</div><div class="">The green line disappears, but a debug window popped up.</div><div class="">So, I changed the class back to “Morph” … and then a “Recompiling” dialog popped up … and stayed there.</div><div class="">Then debug windows started popping all over — to the point where the whole display is unusable.</div><div class=""><br class=""></div><div class="">It looks like it may have generated a log file for each debug message (there are 16 of them … 😉)</div><div class=""><br class=""></div><div class="">Here’s a screen recording (.mov file) of what it looked like:<a moz-do-not-send="true" href="https://www.dropbox.com/s/ja6hynzfpka5jua/Cuis-Smalltalk-Issue02.mov?dl=0" class="">https://www.dropbox.com/s/ja6hynzfpka5jua/Cuis-Smalltalk-Issue02.mov?dl=0</a></div></blockquote><br style="caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; background-color: rgb(255, 255, 255); text-decoration: none;" class=""><span style="caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; background-color: rgb(255, 255, 255); text-decoration: none; float: none; display: inline !important;" class="">As Hilaire already pointed out, changing the class definition while having live instances might leave them in an inconsistent state. In this case, the system doesn't know how to initialize the 'new' instance variables added by MovableMorph being the superclass. They are left as nil, and stuff breaks.</span><br style="caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; background-color: rgb(255, 255, 255); text-decoration: none;" class=""><br style="caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; background-color: rgb(255, 255, 255); text-decoration: none;" class=""><blockquote cite="mid:4F0725DF-4D49-49AE-89E4-477B16397AB2@virtualmdj.com" type="cite" style="font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px; background-color: rgb(255, 255, 255); text-decoration: none;" class=""><div class="">I guess my overall questions are:</div><div class=""><span class="Apple-tab-span" style="white-space: pre;"> </span>Should these kinds of things be happening?</div></blockquote><br style="caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; background-color: rgb(255, 255, 255); text-decoration: none;" class=""><span style="caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; background-color: rgb(255, 255, 255); text-decoration: none; float: none; display: inline !important;" class="">Yes. It is like going in a car on the highway, and taking a wrench and messing with the engine without even pulling to the curbside. It is a consequence of a completely live and open system.</span><br style="caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; background-color: rgb(255, 255, 255); text-decoration: none;" class=""><br style="caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; background-color: rgb(255, 255, 255); text-decoration: none;" class=""><blockquote cite="mid:4F0725DF-4D49-49AE-89E4-477B16397AB2@virtualmdj.com" type="cite" style="font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px; background-color: rgb(255, 255, 255); text-decoration: none;" class=""><div class=""><span class="Apple-tab-span" style="white-space: pre;"> </span>Or are these somehow n00b errors on my part?</div></blockquote><br style="caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; background-color: rgb(255, 255, 255); text-decoration: none;" class=""><span style="caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; background-color: rgb(255, 255, 255); text-decoration: none; float: none; display: inline !important;" class="">Not at all. I've developed the Morphic framework you are using. You'd have to see the thousands times I froze my image because I didn't realize the full consequences of some change.</span><br style="caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; background-color: rgb(255, 255, 255); text-decoration: none;" class=""><br style="caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; background-color: rgb(255, 255, 255); text-decoration: none;" class=""><blockquote cite="mid:4F0725DF-4D49-49AE-89E4-477B16397AB2@virtualmdj.com" type="cite" style="font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px; background-color: rgb(255, 255, 255); text-decoration: none;" class=""><div class=""><span class="Apple-tab-span" style="white-space: pre;"> </span>How can I ensure data is lost as I experiment with the environment?</div></blockquote><br style="caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; background-color: rgb(255, 255, 255); text-decoration: none;" class=""><span style="caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; background-color: rgb(255, 255, 255); text-decoration: none; float: none; display: inline !important;" class="">Ensuring date is lost is really easy!!! I guess you mean ensuring data is not lost!</span><br style="caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; background-color: rgb(255, 255, 255); text-decoration: none;" class=""><br style="caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; background-color: rgb(255, 255, 255); text-decoration: none;" class=""><span style="caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; background-color: rgb(255, 255, 255); text-decoration: none; float: none; display: inline !important;" class="">The system keeps track of all the code you write and the Smalltalk expressions you evaluate. These are not lost even if you kill Smalltalk from the host OS. Check the *.changes files. WRT to live objects in the image, these will be lost if you need to kill the image for whatever reason. An alternative is to save the image from time to time. Personally, I generally prefer to create examples with 'doit' Workspace expressions. These get saved in the *.user.*.changes files.</span><br style="caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; background-color: rgb(255, 255, 255); text-decoration: none;" class=""><br style="caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; background-color: rgb(255, 255, 255); text-decoration: none;" class=""><blockquote cite="mid:4F0725DF-4D49-49AE-89E4-477B16397AB2@virtualmdj.com" type="cite" style="font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px; background-color: rgb(255, 255, 255); text-decoration: none;" class=""><div class=""><span class="Apple-tab-span" style="white-space: pre;"> </span>Since the whole philosophy of Smalltalk is to be able to examine the whole system and try things, I’d like to do that without worrying that the next thing I do could blow up the environment. 😉</div><div class=""><span class="Apple-tab-span" style="white-space: pre;"> </span>These don’t seem like things that should freeze the environment.</div></blockquote><br style="caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; background-color: rgb(255, 255, 255); text-decoration: none;" class=""><span style="caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; background-color: rgb(255, 255, 255); text-decoration: none; float: none; display: inline !important;" class="">I don't think that is even possible. If you can examine any part of the system, there will always ways to break it. Smalltalk is not a sandbox for safe playing. Don't worry. You'll get used to it, and learn how to never lose your stuff. The freedom Smalltalk gives you is well worth this learning experience!</span><br style="caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; background-color: rgb(255, 255, 255); text-decoration: none;" class=""><br style="caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; background-color: rgb(255, 255, 255); text-decoration: none;" class=""><blockquote cite="mid:4F0725DF-4D49-49AE-89E4-477B16397AB2@virtualmdj.com" type="cite" style="font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px; background-color: rgb(255, 255, 255); text-decoration: none;" class=""><div class="">Thanks, in advance, for any insights you might have.</div><div class=""><br class=""></div><div class=""><span class="Apple-tab-span" style="white-space: pre;"> </span>— Mark</div></blockquote><br style="caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; background-color: rgb(255, 255, 255); text-decoration: none;" class=""><span style="caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; background-color: rgb(255, 255, 255); text-decoration: none; float: none; display: inline !important;" class="">You're most welcome. Keep telling about stuff you find annoying. Fresh eyes always see new things. This time, for instance, you reported two, and one of them resulted in an enhancement. The other, hopefully, helped you learn something. Both were positive outcomes!</span><br style="caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; background-color: rgb(255, 255, 255); text-decoration: none;" class=""><br style="caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; background-color: rgb(255, 255, 255); text-decoration: none;" class=""><span style="caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; background-color: rgb(255, 255, 255); text-decoration: none; float: none; display: inline !important;" class="">Cheers,</span><br style="caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; background-color: rgb(255, 255, 255); text-decoration: none;" class=""><pre class="moz-signature" cols="72" style="caret-color: rgb(0, 0, 0); font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; word-spacing: 0px; -webkit-text-stroke-width: 0px; background-color: rgb(255, 255, 255); text-decoration: none;">-- Juan Vuletich <a class="moz-txt-link-abbreviated" href="http://www.cuis-smalltalk.org/">www.cuis-smalltalk.org</a> <a class="moz-txt-link-freetext" href="https://github.com/Cuis-Smalltalk/Cuis-Smalltalk-Dev">https://github.com/Cuis-Smalltalk/Cuis-Smalltalk-Dev</a> <a class="moz-txt-link-freetext" href="https://github.com/jvuletich">https://github.com/jvuletich</a> <a class="moz-txt-link-freetext" href="https://www.linkedin.com/in/juan-vuletich-75611b3">https://www.linkedin.com/in/juan-vuletich-75611b3</a> @JuanVuletich</pre><span style="caret-color: rgb(0, 0, 0); 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