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Add elements to a Set using Javascript
The add method checks if a value already exists in the set, if not, then it adds that value to the set. We can implement it as follows −
Example
add(val) {
if (!this.has(val)) {
this.container[val] = val; return true;
}
return false;
}You can test this using −
Example
const testSet = new MySet(); testSet.add(1); testSet.add(2); testSet.add(5); testSet.add(2); testSet.display(); console.log(testSet.has(5)); console.log(testSet.has(20)); console.log(testSet.has(1));
Output
This will give the output −
{ '1': 1, '2': 2, '5': 5 }
True
False
TrueNote that even though we tried adding 2 twice, it only got added once. If you try logging it, you'll get a false. This is because of the values we're returning if we don't add it.
In ES6, you use the add function as follows −
Example
const testSet = new MySet(); testSet.add(1); testSet.add(2); testSet.add(5); testSet.add(2); console.log(testSet.has(5)); console.log(testSet.has(20)); console.log(testSet.has(1));
Output
This will give the output −
True False True
Updated on: 15-Jun-2020
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