Emacs Lisp: Sequence Functions

Here are functions that work on Sequence type.

Convert or Join Sequence

• Emacs Lisp: Join or Convert List, Vector, String

Sequence Functions

These functions work on any Sequence Type .

Those starting with “seq-” are new in Emacs 25 (Released 2016-09) . They are from “seq.el”, and the file is loaded when emacs starts. You may want to explicitly declare (require 'seq).

Some of these provide new functionalities, some gives a unified interface to old functions.

• copy-sequence
• reverse
• nreverse
• sort

• seq-elt (same as elt)
• seq-length (same as length)
• seqp (same as sequencep)

• seq-drop
• seq-take
• seq-take-while
• seq-drop-while
• seq-filter
• seq-remove
• seq-uniq
• seq-subseq

• seq-do
• seq-doseq
• seq-map
• seq-mapn

• seq-min
• seq-max
• seq-reduce

• seq-some
• seq-every-p

;; demo of seq-some
(seq-some (lambda (x) (eq 5 x)) [4 5 6])
;; t

• seq-find
• seq-contains
• seq-position
• seq-count

• seq-empty-p
• seq-sort

• seq-concatenate
• seq-mapcat
• seq-partition
• seq-intersection
• seq-difference
• seq-group-by
• seq-into

Misc

• nconc

Reference

• Sequence Functions (ELISP Manual)
• Sets And Lists (ELISP Manual)