JavaScript function to check 2 arrays have any common element or not. return true or false.

commonElementExist.js

// function to check 2 arrays have any common element or not
// @return
// matched : true/false  
// @args
// a1 :: array
// a2 :: array
function commonElementExist(a1, a2){
    var matched = false;
    a1.forEach(function(e1){
        if(a2.indexOf(e1) != -1){
            matched = true;
            return false;
        }
    });
    return matched;
};