KeySelect

KeySelect[assoc,crit]

selects elements in the association assoc for which crit applied to their keys is True.

represents an operator form of KeySelect that can be applied to an expression.

Details

KeySelect yields an Association object whose elements appear in the same order as they did in assoc.
KeySelect can be applied not only to Association objects, but also to lists of rules.
KeySelect[crit][assoc] is equivalent to KeySelect[assoc,crit].

Select entries with odd keys:

Select entries from an association, using another association as a criterion:

Use the operator form of KeySelect:

Introduced in 2014

(10.0)

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