compare elements of two arrays javascript code example

Example 1: javascript find matching elements in two arrays

const intersection = array1.filter(element => array2.includes(element));

Example 2: how to compare two arrays javascript

function arraysAreIdentical(arr1, arr2){
    if (arr1.length !== arr2.length) return false;
    for (var i = 0, len = arr1.length; i < len; i++){
        if (arr1[i] !== arr2[i]){
            return false;
        }
    }
    return true; 
}

Example 3: javascript find matching elements in two arrays

let firstArray = ["One", "Two", "Three", "Four", "Five"];
let secondArray = ["Three", "Four"];

let map = {};
firstArray.forEach(i => map[i] = false);
secondArray.forEach(i => map[i] === false && (map[i] = true));
let jsonArray = Object.keys(map).map(k => ({ name: k, matched: map[k] }));

Example 4: comparing two arrays in javascript

const arr1 = [1, 2, 3];
const arr2 = [1, 3, 3];

if (arr1.length !== arr2.length) return console.log("false");
for (let i = 0; i < arr1.length; i++) {
    for (let j = 0; j < arr2.length; j++) {
        if (arr1[i] === arr2[j]) {
            console.log("yes match", arr1[i], arr2[j]);
            continue;
        }
        console.log("no match", arr1[i], arr2[j]);
    }
}

Example 5: compare between two arrays javascript

const equals = (a, b) => JSON.stringify(a) === JSON.stringify(b);
let arr1 = ['1','2'];
let arr2 = ['1','2'];
equals(arr1,arr2)//this return false , if not equal then its return false

Tags:

Javascript Example

Recent Posts