2when ( ..a x y pred: ( ..a x y -- ..b ? ) true: ( ..b x y -- ..b x y ) -- ..b x y ) (original) (raw)
Vocabulary
kernel
Inputs
| x | an object |
|---|---|
| y | an object |
| pred | a quotation |
| true | a quotation |
Outputs
| x | an object |
|---|---|
| y | an object |
Word description
A variant of when that takes a pred quotation. Calls 2check on the pred quotation to return a boolean and preserves x and y for both branches. The true branch is called conditionally.
See also
1if, 1when, 1unless, 2if, 2unless, 3if, 3when, 3unless
Definition
: 2when
( ..a x y pred: ( ..a x y -- ..b ? ) true: ( ..b x y -- ..b x y ) -- ..b x y )
[ ] 2if ; inline