copy-seq

Function

Syntax

copy-seq sequence → copied-sequence

Arguments and Values

sequence — a proper sequence.

copied-sequence — a proper sequence.

Description

Creates a copy of sequence. The elements of the new sequence are the same as the corresponding elements of the given sequence.

If sequence is a vector, the result is a fresh simple array of rank one that has the same actual array element type as sequence. If sequence is a list, the result is a fresh list.

Examples

(setq str "a string") → "a string" 
(equalp str (copy-seq str)) → true 
(eql str (copy-seq str)) → false

Exceptional Situations

Should be prepared to signal an error of type type-error if sequence is not a proper sequence.

See Also

copy-list

Notes

From a functional standpoint,

(copy-seq x) ≡ (subseq x 0)

However, the programmer intent is typically very different in these two cases.