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Adding two Sets in Javascript
The operation of adding 2 sets is known as a union. You need to add every object from one set to another while checking for duplicates. We can just use the 2 methods we already implemented to implement this method.
We'll implement this function as a static function as we don’t want to mutate existing sets, but create and return a new one. We first need to check if the object passed to it is really an instance of the MySet class.
Example
static union(s1, s2) {
if (!s1 instanceof MySet || !s2 instanceof MySet) {
console.log("The given objects are not of type MySet");
return null;
}
let newSet = new MySet();
s1.forEach(elem => newSet.add(elem));
s2.forEach(elem => newSet.add(elem));
newSet;
}You can test this using −
Example
const testSet1 = new MySet(); testSet1.add(1); testSet1.add(2); const testSet2 = new MySet(); testSet2.add(2); testSet2.add(5); let testSet3 = MySet.union(testSet1, testSet2); testSet3.display();
Output
This will give the output −
{ '1': '1', '2': '2', '5': '5' }Note that the union function is not there in the ES6 API as well. You can make this function be available in the Set class as follows &minusl
Example
Set.union = function(s1, s2) {
if (!s1 instanceof Set || !s2 instanceof Set) {
console.log("The given objects are not of type Set");
return null;
}
let newSet = new Set();
s1.forEach(elem => newSet.add(elem));
s2.forEach(elem => newSet.add(elem));
return newSet;
}You can test this using −
Example
let setA = new Set([1, 2, 3, 4]); let setB = new Set([2, 3]); console.log(Set.union(setA, setB));
Output
This will give the output −
Set { 1, 2, 3, 4 }
Updated on: 15-Jun-2020
2K+ Views
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