Function `copy-seq`

copy-seq sequence → copied-sequence

copied-sequence—a proper sequence.

14.1.0 8Creates a copy of sequence. The elements of the new sequence are the same as the corresponding elements of the given sequence.

Moon's suggested interpretation follows:

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.

End Moon's suggested interpretation.

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

None.

None.

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

From a functional standpoint,

 (copy-seq x) ≡ (subseq x 0)

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

Function copy-seq