bounds-check? ( n seq -- ? )
Factor handbook » The language » Collections » Sequence operations » Testing sequences
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Vocabulary
sequences

Inputs
nan integer
seqa sequence


Outputs
?a boolean


Word description
Tests if the index is within the bounds of the sequence.

Examples
USING: prettyprint sequences ; 5 { 1 2 3 } bounds-check? .
f


Definition
IN: sequences

GENERIC#: bounds-check? 1 ( n seq -- ? )


Methods
USING: kernel math sequences ;

M: integer bounds-check?
dupd length < [ 0 >= ] [ drop f ] if ; inline