Vanilla Javascript equivalent for lodash _.includes

Question

I'm using the lodash includes function 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? Is there no ES5 Array.prototype equivalent?

Or is my only option to use indexOf?

Answer 1

ES2016: 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 as:

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