Why includes() works with a string?

[karlito]

Hello,

In MDN doc : " The includes() method determines whether an array includes a certain value among its entries, returning true or false as appropriate."

But If I use a string:

let string = 'string'
console.log(string.includes('i'))

That’s works well.
Why ?

[JeremyLT]

includes is also defined on the string prototype:

String.prototype.includes() - JavaScript | MDN

There are a fair number of methods that work on both strings and arrays. When I’m in doubt, I just Google “MDN methodname” and if its defined for both arrays and strings those two pieces of documentation are typically the first two results.

[karlito]

Yes, good trick !
Thanks again as usually.