Question

How to compare two arrays in JavaScript

Answer 1

let arr1 = [1, 2, 5, 9];
let arr2 = [1, 2, 5, 9, 0];

let equal = JSON.stringify(arr1) === JSON.stringify(arr2);

console.log(equal);


    
    
/*
run:
    
false
    
*/

 

70+ SQL courses for beginners and professionals

Answer 2

let arr1 = [1, 2, 5, 9];
let arr2 = [1, 2, 5, 9];

let equal = arr1.toString() === arr2.toString();

console.log(equal);


    
    
/*
run:
    
true
    
*/

 

70+ SQL courses for beginners and professionals

Answer 3

let arr1 = [1, 2, 5, 9, "a", "b", "c"];
let arr2 = [1, 2, 5, 9, "a", "b", "c"];
 
if (arr1.length == arr2.length &&
    arr1.every(function(u, i) {
        return u === arr2[i];
    })) {
   console.log(true);
} else {
   console.log(false);
}

 
 
     
     
/*
run:
     
true
     
*/

 

70+ SQL courses for beginners and professionals