javascript - Difference between String.prototype.includes/contains in ES6? What about .has? -

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i wondering of these methods become standard. i've seen both methods yield similar results, yet i'm not sure why there 2 versions/aliases. there difference among them? also, why did es6 use .has when could've used .contains or .includes serve multiple purposes under 1 name.

i aware .has isn't used on strings.

support tests:

        | contains      includes chrome  | no            yes firefox | yes           yes nodejs  | yes           no


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