extend.js
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'use strict';
/*!
* node.extend
* Copyright 2011, John Resig
* Dual licensed under the MIT or GPL Version 2 licenses.
* http://jquery.org/license
*
* @fileoverview
* Port of jQuery.extend that actually works on node.js
*/
var is = require('is');
var extend = function extend() {
var target = arguments[0] || {};
var i = 1;
var length = arguments.length;
var deep = false;
var options, name, src, copy, copyIsArray, clone;
// Handle a deep copy situation
if (typeof target === 'boolean') {
deep = target;
target = arguments[1] || {};
// skip the boolean and the target
i = 2;
}
// Handle case when target is a string or something (possible in deep copy)
if (typeof target !== 'object' && !is.fn(target)) {
target = {};
}
for (; i < length; i++) {
// Only deal with non-null/undefined values
options = arguments[i];
if (options != null) {
if (typeof options === 'string') {
options = options.split('');
}
// Extend the base object
for (name in options) {
src = target[name];
copy = options[name];
// Prevent never-ending loop
if (target === copy) {
continue;
}
// Recurse if we're merging plain objects or arrays
if (deep && copy && (is.hash(copy) || (copyIsArray = is.array(copy)))) {
if (copyIsArray) {
copyIsArray = false;
clone = src && is.array(src) ? src : [];
} else {
clone = src && is.hash(src) ? src : {};
}
// Never move original objects, clone them
target[name] = extend(deep, clone, copy);
// Don't bring in undefined values
} else if (typeof copy !== 'undefined') {
target[name] = copy;
}
}
}
}
// Return the modified object
return target;
};
/**
* @public
*/
extend.version = '1.1.3';
/**
* Exports module.
*/
module.exports = extend;