Name Rascal/Libraries/Prelude/Set/toMapUnique

Synopsis Convert a set of tuples to a map (provided that there are no multiple keys).

Function map[&A,&B] toMapUnique(rel[&A, &B] st) throws MultipleKey

Usage import Set;

Description Convert a set of tuples to a map. The result should be a legal map (i.e., without multiple keys).

Examples

rascal>import Set;
ok
rascal>toMapUnique({<"a", 1>, <"b", 2>, <"c", 10>});
map[str, int]: ("a":1,"b":2,"c":10)

Now explore an erroneous example:

rascal>toMapUnique({<"a", 1>, <"b", 2>, <"a", 10>});
|rascal://Set|(11348,931,<562,0>,<601,70>): MultipleKey("a")
	at *** somewhere ***(|rascal://Set|(11348,931,<562,0>,<601,70>))
	at toMapUnique(|stdin:///|(39,2,<1,39>,<1,41>))

Questions

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