Rascal/Expressions/Values/Map/Difference

Name Rascal/Expressions/Values/Map/Difference

Synopsis The difference between two maps.

Syntax Exp₁ - Exp₂

Types

`Exp₁`	`Exp₂`	`Exp₁ - Exp₂`
`map[TK₁, TV₁]`	`map[TK₂, TV₂]`	`map[lub(TK₁,TK₂),lub(TK₁,TK₂)]`

Description The result is the difference of the two map values of Exp₁ and Exp₂, i.e. a map with all pairs in Exp₁ that do have a key that does not occur in Exp₂.

Examples

rascal>("apple": 1, "pear": 2) - ("banana": 3, "apple": 4);
map[str, int]: ("pear":2)

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