Check if an array contains any element of another array in JavaScript

Question

I have a target array [\"apple\",\"banana\",\"orange\"], and I want to check if other arrays contain any one of the target array elements.

For example:

Answer 1

Adding to Array Prototype

Disclaimer: Many would strongly advise against this. The only time it'd really be a problem was if a library added a prototype function with the same name (that behaved differently) or something like that.

Code:

Array.prototype.containsAny = function(arr) {
    return this.some(
        (v) => (arr.indexOf(v) >= 0)
    )
}

Without using big arrow functions:

Array.prototype.containsAny = function(arr) {
    return this.some(function (v) {
        return arr.indexOf(v) >= 0
    })
}

Usage

var a = ["a","b"]

console.log(a.containsAny(["b","z"]))    // Outputs true

console.log(a.containsAny(["z"]))    // Outputs false