How would I check if an array carries a value in JavaScript?

Question

How would I check if an array carries a value in JavaScript?

What is the briefest and proficient approach to see whether a JavaScript array contains a value?

This is the lone 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 superior and more compact approach to achieve this?

algorithm array javascript

3 years ago by Bharatv4tg1

2 Answers

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**sandhya6gczb** · Answer 1 · 2021-05-05T12:59:25

Modern browsers have Array#includes, which does exactly that and is widely supported by everyone except IE:

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

You can also use Array#indexOf, which is less direct but doesn't require polyfills for outdated browsers.

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

**MounikaDasa** · Answer 2 · 2021-05-07T14:16:40

Use:

function isInArray(array, search)
{
return array.indexOf(search) >= 0;
}

// Usage
if(isInArray(my_array, "my_value"))
{
//...
}

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How would I check if an array carries a value in JavaScript?

2 Answers

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