578ed1ba98
Moving all of my Emacs-related files into their own directory at the root of this repository.
98 lines
2.1 KiB
EmacsLisp
98 lines
2.1 KiB
EmacsLisp
;;; enum.el --- Enumerable protocol for Elisp -*- lexical-binding: t -*-
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;; Author: William Carroll <wpcarro@gmail.com>
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;;; Commentary:
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;; Heavily influenced by Elixir.
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;; I will not be implement every function in the Enum library, since I don't
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;; need every function. Some of the streaming functionality may prove difficult
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;; to write in Elisp. We shall see.
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;; TODO: Implement the following functions:
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;; - all?/2
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;; - any?/2
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;; - at/3
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;; - chunk_by/2
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;; - chunk_every/{2,3,4}
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;; - chunk_while/4
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;; - concat/1
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;; - concat/2
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;; - count/{1,2}
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;; - dedup/1 # prefer calling this function dedupe
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;; - dedup_by/2 # same as above
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;; - drop/2
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;; - drop_every/2
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;; - drop_while/2
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;; - each/2
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;; - empty?/1
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;; - fetch/2
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;; - fetch!/2
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;; - filter/2
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;; - find/3
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;; - find_index/2
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;; - find_value/3
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;; - flat_map/2
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;; - flat_map_reduce/3
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;; - group_by/3
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;; - intersperse/2
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;; - into/{2,3}
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;; - join/2
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;; - map/2
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;; - map_every/3
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;; - map_join/3
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;; - map_reduce/3
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;; - max/2
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;; - max_by/3
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;; - member?/2 # consider calling this contains?
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;; - min/2
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;; - min_by/2
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;; - min_max/2 # This is a great function because of O(n) time.
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;; - min_max_by/3
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;; - random/1 # Consider just sample with num=1
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;; - reduce/{2,3}
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;; - reduce_while/3
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;; - reject/2
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;; - reverse/{1,2}
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;; - reverse_slice/3
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;; - scan/{2,3}
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;; - shuffle/1
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;; - slice/{2,3}
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;; - sort/{1,2}
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;; - sort/2
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;; - sort_by/3
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;; - split/2
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;; - split_while/2
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;; - split_with/2
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;; - sum/1
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;; - take/2
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;; - take_every/2
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;; - take_random/2 # prefer calling this function sample
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;; - take_while/2
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;; - to_list/1
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;; - uniq/1 # prefer calling this unique
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;; - uniq_by/2 # prefer calling this unique-by
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;; - unzip/1
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;; - with_index/2
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;; - zip/{1,2}
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;; TODO: Consider how to handle dispatching by type.
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;; TODO: Which types should be supported herein?
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;; - linked-lists
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;; - associative-lists
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;; - cycles
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;; Warning: This module is a total work-in-progress, and it's quite possible
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;; that I may never even finish it.
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;;; Code:
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(defun enum/count (xs)
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"Return the number of elements in `XS'."
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(cond
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((alist/instance? xs) (alist/count xs))
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((list/instance? xs) (list/length xs)))
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)
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(provide 'enum)
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;;; enum.el ends here
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