when ( ..a ? true: ( ..a -- ..a ) -- ..a )
Factor handbook » The language » Combinators » Conditional combinators

Prev:	if ( ..a ? true: ( ..a -- ..b ) false: ( ..a -- ..b ) -- ..b )
Next:	unless ( ..a ? false: ( ..a -- ..a ) -- ..a )

Vocabulary
kernel

Inputs

?	a generalized boolean
true	a quotation

Outputs
None

Word description
If cond is not f, calls the true quotation.

The cond value is removed from the stack before the quotation is called.

Examples

USING: kernel math prettyprint ; -5 dup 0 < [ 3 + ] when .
-2

Definition

IN: kernel

: when ( ..a ? true: ( ..a -- ..a ) -- ..a ) [ ] if ; inline