raptor-polyfill/array/some.js

Polyfills for various EcmaScript 5 and EcmaScript 6 methods distributed as CommonJS modules that can be require'd individually or as a whole.

// ES5 15.4.4.17
// http://es5.github.com/#x15.4.4.17
// https://developer.mozilla.org/en/JavaScript/Reference/Global_Objects/Array/some
if (!Array.prototype.some) {
    var toObject = require('./_toObject');

    Array.prototype.some = function some(fun /*, thisp */) {
        var self = toObject(this),
            length = self.length >>> 0,
            thisp = arguments[1];

        // If no callback function or if callback is not a callable function
        if (typeof fun !== "function") {
            throw new TypeError();
        }

        for (var i = 0; i < length; i++) {
            if (i in self && fun.call(thisp, self[i], i, self)) {
                return true;
            }
        }
        return false;
    };
}