var ary = ["JavaScript", "Java", "CoffeeScript", "TypeScript"];

ary.some(function (value, index, _ary) {
    console.log(index + ": " + value);
    return value === "CoffeeScript";
});
// output: 
// 0: JavaScript
// 1: Java
// 2: CoffeeScript

ary.every(function(value, index, _ary) {
    console.log(index + ": " + value);
    return value.indexOf("Script") > -1;
});
// output:
// 0: JavaScript
// 1: Java

Array.prototype.forEach
You can't break forEach. So use "some" or "every".
Array.prototype.some
some is pretty much the same as forEach but it break when the callback returns true.
Array.prototype.every
every is almost identical to some except it's expecting false to break the loop.

forEach. How to break?

array

JavaScript