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What are some REPLs for Emacs Lisp?
Is there only one that is within Emacs?
Are there some that run inside terminal outside Emacs?
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a Lisp REPL is different to most other textual interactive interfaces, because it is based on the idea of data I/O of s-expressions and evaluating these. a REPL is a general term describing textual interactive interfaces to programming language implementations or subsets of those.
Introduction. Gnu emacs can provide an interface to any Common Lisp system.
By default, Common Lisp is lexically scoped, that is, every variable is lexically scoped except for special variables. By default, Emacs Lisp files are dynamically scoped, that is, every variable is dynamically scoped. The my-test. el is a lexically scoped file because of the first line.
Based on this question: REPL on console emacs, you can use M-x ielm (inferior emacs lisp mode).
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There is a (work in progress) REPL for Emacs for use from the command line. It currently supports basic command line editing and history.
The code is hosted on Github.
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