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Add difference, intersection, and union methods to RealSet.

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Kris Maglione
2014-02-22 10:20:09 -08:00
parent 619b414ca7
commit 2277a5b238
1 changed files with 15 additions and 0 deletions
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15
common/modules/base.jsm
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@@ -395,6 +395,21 @@ RealSet.prototype.add = function RealSet_add(val) {
return res; return res;
}; };
RealSet.prototype.difference = function RealSet_difference(set) {
return RealSet(i for (i of this) if (!set.has(i)));
};
RealSet.prototype.intersection = function RealSet_intersection(set) {
return RealSet(i for (i of this) if (set.has(i)));
};
RealSet.prototype.union = function RealSet_union(set) {
let res = RealSet(this);
for (let item of set)
res.add(item);
return res;
};
/** /**
* Utility for managing sets of strings. Given an array, returns an * Utility for managing sets of strings. Given an array, returns an
* object with one key for each value thereof. * object with one key for each value thereof.