Kilobyte Constants, a Simple and Beautiful Idea that Hasn't Caught On http://t.co/ouw7CvWnM4 (I suppose reader macros can provide this too)
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I've added syntax highlighting to the prompt of my programming language!
It's not strictly necessary, but it's nice to have. It caught a bug with lexing incomplete string literals too.
zsh is generally wonderful, and it's sufficiently like bash/POSIX sh that it works.
However, it uses 1-indexed arrays, whereas bash uses 0-indexed arrays. This totally caught me out.
The ability to define small commands for npm with package.json is incredibly convenient and powerful.
I wonder why this hasn't caught on for other languages?