How do I check if an array includes a value in JavaScript?

Javascript

This is the only way I know to do it:

function contains(a, obj) {
 for (var i = 0; i < a.length; i++) {
 if (a[i] === obj) {
 return true;
 }
 }
 return false;
}

Is there a better and more concise way to accomplish this?

Comments

Yasen Sayed

13 Feb 2022

Best Answer

You can use this in the modern browsers, code to check the array

console.log(['joe', 'jane', 'mary'].includes('jane')); //true

Also, you can the indexOf method like this:

console.log(['joe', 'jane', 'mary'].indexOf('jane') >= 0); //true

Joseph Morgan

13 Feb 2022

let arr = ['orange', 'blue', 'red'];
let index = arr.indexOf('blue');
if(index > -1){
	//Exists
 console.log(arr[index]);
}

also, you can use this way using indexOf