fill

(fill sequence item &key start end)

Stores item into every element of sequence between :start (default 0) and :end (default the length) and returns the sequence. Destructive, as in CL: a vector -- a general one, a packed (unsigned-byte 8|16|32) or float vector, or a string allocated by make-string or make-array :element-type 'character -- is written in place, and so is a list. A string LITERAL is supported too, but on the compiled backends it is an immutable value, so fill returns a fresh string instead of mutating it (the interpreter mutates in place) -- the same deviation as replace. Available on all backends except --no-gc.