Rascal/Expressions/Values/Map/in

Synopsis Membership test on the keys of a map.

Syntax Exp₁ in Exp₂

Types

`Exp₁`	`Exp₂`	`Exp₁ in Exp₂`
`T₁` <: `TK`	`map[TK, TV]`	`bool`

Description Yields true if the value of Exp₁ occurs as key in the map value of Exp₂ and false otherwise. The type of Exp₁ should be compatible with the key type TK of Exp₂.

Examples

rascal>"pear" in ("apple": 1, "pear": 2);
bool: true
rascal>"pineapple" in ("apple": 1, "pear": 2);
bool: false

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