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Article
Browsers and browser-based apps are turning into full-fledged operating systems in their own right — and use enough memory to match.... Run a few of these, and all of a sudden, it isn’t Xcode being the only memory hog.
Article
When you’ve been working on an app for a while, especially as it gets large, you often start to include snippets of code in the app that have been useful for debugging your app in the past.

Such tools become an integral part of your debugging environment; but do you really want to ship those in your app? You could comment them out before you release, but after a marathon debug session, do you trust that you’ll comment out again all of the debugging tools you enabled?
Article
"When you build your clone app, you will encounter the same problems the original developers had writing the original app.... This is what makes building a clone app a way to level up your skills."