Vanilla Javascript equivalent for lodash _.includes

Question

I am using lodash function includes

to check if a target value exists in an array ...

_.includes(array, target)

and was hoping to find a good equivalent in ES5 (or ES6)

Did I miss something? Isn't there an ES5 equivalent Array.prototype?

Or is my only option to use indexOf

?

+3

sfletche Jul 17 15 at 0:04

1 answer

bfred.it · Accepted Answer · 2015-07-17T02:46:01+0000

ES7: Array.prototype.includes()

[1, 2, 3].includes(2);     // true

ES5: Array.prototype.indexOf()

>= 0

[2, 5, 9].indexOf(5) >= 0;   // true
[2, 5, 9].indexOf(7) >= 0;   // false

If you prefer a function:

function includes (array, element) { return array.indexOf(element) >= 0 }

and use it like:

includes([2, 5, 9], 5);    // true