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  ANSI Common Lisp   17 Sequences   17.3 Dictionary of Sequences

17.3.4 fill Function

Syntax:
fill sequence item &key start end    sequence

Arguments and Values:
sequence - a proper sequence.

item - a sequence.

start, end - bounding index designators of sequence. The defaults for start and end are 0 and nil, respectively.

Description:
Replaces the elements of sequence bounded by start and end with item.

Examples:
 (fill (list 0 1 2 3 4 5) '(444))  ((444) (444) (444) (444) (444) (444))
 (fill (copy-seq "01234") #\e :start 3)  "012ee"
 (setq x (vector 'a 'b 'c 'd 'e))  #(A B C D E)
 (fill x 'z :start 1 :end 3)  #(A Z Z D E)
 x  #(A Z Z D E)
 (fill x 'p)  #(P P P P P)
 x  #(P P P P P)

Side Effects:
Sequence is destructively modified.

Exceptional Situations:
Should be prepared to signal an error of type type-error if sequence is not a proper sequence. Should signal an error of type type-error if start is not a non-negative integer. Should signal an error of type type-error if end is not a non-negative integer or nil.

See Also:
replace, nsubstitute

Notes:
(fill sequence item) == (nsubstitute-if item (constantly t) sequence)

Allegro CL Implementation Details:
None.

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