filter ( ... seq quot: ( ... elt -- ... ? ) -- ... subseq )
Factor handbook » The language » Collections » Sequence operations » Sequence combinators

Prev:	accumulate*-as ( ... seq identity quot: ( ... prev elt -- ... next ) exemplar -- ... newseq )
Next:	filter-as ( ... seq quot: ( ... elt -- ... ? ) exemplar -- ... subseq )

Vocabulary
sequences

Inputs

seq	a sequence
quot	a quotation with stack effect ( ... elt -- ... ? )

Outputs

subseq

a new sequence

Word description
Applies the quotation to each element in turn, and outputs a new sequence containing the elements of the original sequence for which the quotation output a true value.

See also
filter-as, filter!, reject, reject-as, reject!, sift, harvest

Definition

USING: kernel ;

IN: sequences

: filter
    ( ... seq quot: ( ... elt -- ... ? ) -- ... subseq )
    over filter-as ; inline