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77 lines
2.1 KiB
77 lines
2.1 KiB
var hasOwn = Object.prototype.hasOwnProperty;
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function isPlainObject(obj) {
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if (!obj || toString.call(obj) !== '[object Object]' || obj.nodeType || obj.setInterval)
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return false;
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var has_own_constructor = hasOwnProperty.call(obj, 'constructor');
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var has_is_property_of_method = hasOwnProperty.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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// 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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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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}
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// Handle case when target is a string or something (possible in deep copy)
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if ( typeof target !== "object" && typeof target !== "function") {
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target = {};
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}
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for ( ; i < length; i++ ) {
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// Only deal with non-null/undefined values
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if ( (options = arguments[ i ]) != 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 = Array.isArray(copy)) ) ) {
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if ( copyIsArray ) {
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copyIsArray = false;
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clone = src && Array.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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