?push ( elt seq/f -- seq )

Vocabulary

vectors

Inputs

elt	an object
seq/f	a resizable mutable sequence or f

Outputs

seq	a resizable mutable sequence

Word description

If the given sequence is f, creates and outputs a new one-element vector holding elt. Otherwise, pushes elt onto the given sequence.

Errors

Throws an error if seq is not resizable, or if the type of elt is not permitted in seq.

Side effects

Modifies seq

Definition

USING: kernel sequences ;

IN: vectors

: ?push ( elt seq/f -- seq ) [ [ push ] keep ] [ 1vector ] if* ;