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| ANSI Common Lisp 17 Sequences ### 17.1 Sequence Concepts A sequence is an ordered collection of elements, implemented as either a vector or a list. Sequences can be created by the function make-sequence, as well as other functions that create objects of types that are subtypes of sequence (e.g., list, make-list, mapcar, and vector). A sequence function is a function defined by this specification or added as an extension by the implementation that operates on one or more sequences. Whenever a sequence function must construct and return a new vector, it always returns a simple vector. Similarly, any strings constructed will be simple strings.
Standardized Sequence Functions
concatenate | length | remove
copy-seq | map | remove-duplicates
count | map-into | remove-if
count-if | merge | remove-if-not
count-if-not | mismatch | replace
delete | notany | reverse
delete-duplicates | notevery | search
delete-if | nreverse | some
delete-if-not | nsubstitute | sort
elt | nsubstitute-if | stable-sort
every | nsubstitute-if-not | subseq
fill | position | substitute
find | position-if | substitute-if
find-if | position-if-not | substitute-if-not
find-if-not | reduce |
17.1.1 General Restrictions on Parameters that must be Sequences

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