SWI-Prolog -- keys/2

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Predicate keys/2

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Availability::- use_module(library(janus)).(can be autoloaded)

Source

[det]keys(+Dict, ?Keys)

True when Keys is a list of keys that appear in Dict.

Compatibility: PIP. Note that this predicate handle a SWI-Prolog dict, a {k:v, ...} term as well as py({k:v, ...}.