array set code example

Example 1: array to set javascript

const myArray = [1,2,3,1,5,8,1,2,9,4];
const unique = [...new Set(myArray)]; // [1, 2, 3, 5, 8, 9, 4]

const myString = ["a","b","c","a","d","b"];
const uniqueString = [...new Set(myString)]; //["a", "b", "c", "d"]

Example 2: set js

// 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]

Example 3: set in javascript

// set is used for storing unique values
const firstSet = new Set([1, 2, 3]);

firstSet.add('hi'); //adding value to set

firstSet.add(3); //this will not give any error and it will also not be added

firstSet.delete('hi');//removing value from set

console.log(firstSet.has('hi'));//checking 'hi' is in the set or not

// showing all values in the set
console.log(firstSet);
for (const entry of firstSet.values()) {
    console.log(entry);

Example 4: js new array from new set

return Array.from(new Set(this.posts.map(e => e.category)))