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

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at ( key assoc -- value/f )

Vocabulary
assocs

Inputs

key	an object
assoc	an assoc

Outputs

?

a boolean

Word description
Tests if an assoc contains a key.

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

Definition

USING: kernel ;

IN: assocs

: key? ( key assoc -- ? ) at* nip ; inline