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(defun hello (&optional name)
"Say hello, optionally to NAME."
(let ((greetee (or name "World")))
(concat "Hello, " greetee "!")))
Get better at programming through fun, rewarding coding exercises that test your understanding of concepts with Exercism.
Given a string of digits, calculate the largest product for a contiguous substring of digits of length n.
Rebuild binary trees from pre-order and in-order traversals.
Convert modern Arabic numbers into Roman numerals.
Emacs Lisp's syntax is simple, expressive and easy to learn.
Both source code and data are expressed using nested lists.
It's easy to customize the language with Emacs Lisp's macro system.
Emacs Lisp support imperative and functional programming styles.
Emacs Lisp can be used as scripting language by using Emacs' batch mode.
Emacs Lisp is well documented right inside the editor.
Every language has its own way of doing things. Emacs Lisp is no different. Our mentors will help you learn to think like a Emacs Lisp developer and how to write idiomatic code in Emacs Lisp. Once you've solved an exercise, submit it to our volunteer team, and they'll give you hints, ideas, and feedback on how to make it feel more like what you'd normally see in Emacs Lisp - they'll help you discover the things you don't know that you don't know.
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The Emacs Lisp track on Exercism has 85 exercises to help you write better code. Discover new exercises as you progress and get engrossed in learning new concepts and improving the way you currently write.
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