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Creating a Set using Javascript
Let's create a MySet class so that it doesn't hide the actual set class in JS. We'll create a container object that'll keep track of all our values that we add to the set. We'll also create a display function that prints the set for us.
Example
class MySet {
constructor() {
this.container = {};
}
display() {
console.log(this.container);
}
}In ES6, you can directly create a set using the Set class. For example,
Example
const set1 = new Set(); const set2 = new Set([1, 2, 5, 6]);
Checking for membership
The has method checks if a value exists in the set or not. We'll use the Object.hasOwnProperty method to check it in the container. For example,
Example
has(val) {
return this.container.hasOwnProperty(val);
}In ES6 Sets, you can use this directly −
Example
const testSet = new Set([1, 2, 5, 6]); 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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