of ( assoc key -- value/f )
Factor handbook » The language » Collections » Associative mapping operations » Lookup and querying of assocs

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Vocabulary
assocs

Inputs

assoc	an assoc
key	an object

Outputs

value/f

the value associated to the key, or f if the key is not present in the assoc

Word description
Looks up the value associated with a key. This word makes no distinction between a missing value and a value set to f; if the difference is important, use ?of.

See also
at, at*, key?, ?at, ?of

Definition

USING: kernel ;

IN: assocs

: of ( assoc key -- value/f ) swap at ; inline