35 lines
814 B
JavaScript
35 lines
814 B
JavaScript
/**
|
|
* Source: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Set#implementing_basic_set_operations
|
|
*/
|
|
/**
|
|
* returns intersection of two sets
|
|
*/
|
|
export function intersection(setA, setB) {
|
|
const _intersection = new Set();
|
|
for (const elem of setB) {
|
|
if (setA.has(elem)) {
|
|
_intersection.add(elem);
|
|
}
|
|
}
|
|
return _intersection;
|
|
}
|
|
/**
|
|
* returns union of two sets
|
|
*/
|
|
export function union(setA, setB) {
|
|
const _union = new Set(setA);
|
|
for (const elem of setB) {
|
|
_union.add(elem);
|
|
}
|
|
return _union;
|
|
}
|
|
/**
|
|
* returns difference of two sets
|
|
*/
|
|
export function difference(setA, setB) {
|
|
const _difference = new Set(setA);
|
|
for (const elem of setB) {
|
|
_difference.delete(elem);
|
|
}
|
|
return _difference;
|
|
}
|