I have been wondering: What does Apple use to program Xcode? Surely they didn’t program it using Xcode itself right?
Was Xcode even programmed in objective-c?
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Surely they use Xcode itself. There’d be no reason not to.
Xcode is an IDE — basically a fancy editor. Just as you could use emacs or vi or TextMate to edit the code that produces those programs, so too could you edit the source for Xcode with Xcode itself.
If you’re wondering how the first version of Xcode came about, it was most likely created with Project Builder, which was Xcode’s predecessor. And the earliest versions of Project Builder (which originated on NextStep and dates back to the late 1980’s) could have been written with any text editor.