new set() javascript Code Answers

The new Set() constructor is a part of ES6, which is a new version of JavaScript. It has been introduced to overcome some shortcomings of the existing Set data structure. The new Set() constructor is also a collection object in ES6, which allows us to use it as an array or map. The biggest difference between the existing Set and the new Set() constructor lies in the fact that the new Set() constructor can only contain unique values and does not support any methods except for its own ones.

set js

on Jan 01, 1970

// Use to remove duplicate elements from the array 

const numbers = [2,3,4,4,2,3,3,4,4,5,5,6,6,7,5,32,3,4,5]

//spreading numbers of the object into an array using the new operator
console.log([...new Set(numbers)]) 

// [2, 3, 4, 5, 6, 7, 32]

0

set in javascript

on Jan 01, 1970

let mySet = new Set()

mySet.add(1)           // Set [ 1 ]
mySet.add(5)           // Set [ 1, 5 ]
mySet.add(5)           // Set [ 1, 5 ]
mySet.add('some text') // Set [ 1, 5, 'some text' ]
let o = {a: 1, b: 2}
mySet.add(o)

mySet.add({a: 1, b: 2})   // o is referencing a different object, so this is okay

mySet.has(1)              // true
mySet.has(3)              // false, since 3 has not been added to the set
mySet.has(5)              // true
mySet.has(Math.sqrt(25))  // true
mySet.has('Some Text'.toLowerCase()) // true
mySet.has(o)       // true

mySet.size         // 5

mySet.delete(5)    // removes 5 from the set
mySet.has(5)       // false, 5 has been removed

mySet.size         // 4, since we just removed one value

console.log(mySet)
// logs Set(4) [ 1, "some text", {…}, {…} ] in Firefox
// logs Set(4) { 1, "some text", {…}, {…} } in Chrome

0

Create JavaScript Set

on Jan 01, 1970

// create Set
const set1 = new Set(); // an empty set
console.log(set1); // Set {}

// Set with multiple types of value
const set2 = new Set([1, 'hello', {count : true}]);
console.log(set2); // Set {1, "hello", {count: true}}

0

Why use set?

Set is useful when you want to store unique values. For example, if you have a list of user names and want to know whether the same user name was used more than once, then you would use set.

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