lib/support/array/some.js
/**
* Legacy support for browsers that don't support Array.prototype.some.
*
* @module: support/array/some
*/
define(function(require, exports, module) {
"use strict";
// This polyfill isn't necessary.
if (Array.prototype.some) {
return some;
}
/**
* A polyfill for Array#some. Modified from MDN.
*
* @memberOf module:support/array/some
* @param {function} iterator - An interator function to call.
* @param {object} thisArg - An optional context to pass.
* @returns {boolean} Whether or not the iterator returned truthy.
*/
function some(iterator, thisArg) {
// Ensure called with a valid context.
if (this == null) {
throw new TypeError();
}
// Ensure a function was passed as the iterator.
if (typeof iterator !== "function") {
throw new TypeError();
}
// Ensure there is always a `thisArg`.
thisArg = thisArg || this;
// Coerce this value to an Array.
var array = Array.prototype.slice.call(this);
for (var i = 0; i < array.length; i++) {
if (i in array) {
if (iterator.call(thisArg, array[i], i, array)) {
return true;
}
}
}
return false;
}
module.exports = Array.prototype.some = some;
});