LAZY:

Vocabulary

promises

Syntax

LAZY: word ( stack -- effect ) definition... ;

Inputs

None

Outputs

None

Word description

Creates a lazy word in the current vocabulary. When executed the word will return a promise that when forced, executes the word definition. Any values on the stack that are required by the word definition are captured along with the promise.

Examples

USING: arrays sequences prettyprint promises ; IN: scratchpad LAZY: zeroes ( -- pair ) 0 zeroes 2array ; zeroes force second force first .
0

Definition

USING: effects.parser kernel words ;

IN: promises

SYNTAX: LAZY: (:) [ make-lazy-quot ] keep define-declared ;