union! ( set1 set2 -- set1 )
Factor handbook » The language » Collections » Sets » Operations on sets
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Vocabulary
sets

Inputs
set1a set
set2a set


Outputs
set1a set


Word description
Adds all members from set2 to set1.

Side effects
Modifies set1

Definition
USING: kernel sets.private ;

IN: sets

: union! ( set1 set2 -- set1 ) ?members over adjoin-all ;