90 lines
2.2 KiB
JavaScript
90 lines
2.2 KiB
JavaScript
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var hasOwn = Object.prototype.hasOwnProperty;
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var toStr = Object.prototype.toString;
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var undefined;
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var isArray = function isArray(arr) {
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if (typeof Array.isArray === 'function') {
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return Array.isArray(arr);
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}
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return toStr.call(arr) === '[object Array]';
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};
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var isPlainObject = function isPlainObject(obj) {
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'use strict';
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if (!obj || toStr.call(obj) !== '[object Object]') {
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return false;
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}
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var has_own_constructor = hasOwn.call(obj, 'constructor');
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var has_is_property_of_method = obj.constructor && obj.constructor.prototype && hasOwn.call(obj.constructor.prototype, 'isPrototypeOf');
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// Not own constructor property must be Object
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if (obj.constructor && !has_own_constructor && !has_is_property_of_method) {
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return false;
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}
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// Own properties are enumerated firstly, so to speed up,
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// if last one is own, then all properties are own.
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var key;
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for (key in obj) {}
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return key === undefined || hasOwn.call(obj, key);
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};
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module.exports = function extend() {
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'use strict';
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var options, name, src, copy, copyIsArray, clone,
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target = arguments[0],
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i = 1,
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length = arguments.length,
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deep = false;
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// Handle a deep copy situation
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if (typeof target === 'boolean') {
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deep = target;
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target = arguments[1] || {};
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// skip the boolean and the target
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i = 2;
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} else if ((typeof target !== 'object' && typeof target !== 'function') || target == null) {
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target = {};
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}
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for (; i < length; ++i) {
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options = arguments[i];
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// Only deal with non-null/undefined values
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if (options != null) {
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// Extend the base object
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for (name in options) {
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src = target[name];
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copy = options[name];
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// Prevent never-ending loop
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if (target === copy) {
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continue;
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}
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// Recurse if we're merging plain objects or arrays
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if (deep && copy && (isPlainObject(copy) || (copyIsArray = isArray(copy)))) {
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if (copyIsArray) {
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copyIsArray = false;
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clone = src && isArray(src) ? src : [];
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} else {
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clone = src && isPlainObject(src) ? src : {};
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}
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// Never move original objects, clone them
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target[name] = extend(deep, clone, copy);
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// Don't bring in undefined values
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} else if (copy !== undefined) {
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target[name] = copy;
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}
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}
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}
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}
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// Return the modified object
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return target;
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};
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