Created
August 5, 2024 08:19
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extend TS
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| export const extend = (deep: boolean, target: any, ...args: any[]): any => { | |
| if (!_isClass(deep, 'Boolean')) { | |
| args.unshift(target); | |
| [target, deep] = [deep || {}, false]; | |
| } | |
| // Handle case when target is a string or something (possible in deep copy) | |
| target = _isPrimitiveType(target) ? {} : target; | |
| for (const options of args) { | |
| if (options) { | |
| for (const [name, copy] of Object.entries(options)) { | |
| target[name] = _findValue(deep, copy, target[name]); | |
| } | |
| } | |
| } | |
| return target; | |
| }; | |
| // Internal methods from now | |
| const _isClass = (obj: any, str: string): boolean => { | |
| return Object.prototype.toString.call(obj) === `[object ${str}]`; | |
| }; | |
| const _isOwnProp = (obj: any, prop: string): boolean => { | |
| return Object.prototype.hasOwnProperty.call(obj, prop); | |
| }; | |
| const _isTypeOf = (obj: any, str: string): boolean => { | |
| return str === typeof obj; | |
| }; | |
| const _isPlainObj = (obj: any): boolean => { | |
| if (!obj) return false; | |
| if (obj.nodeType || obj.setInterval || !_isClass(obj, 'Object')) return false; | |
| // Not own constructor property must be Object | |
| if (obj.constructor && | |
| !_isOwnProp(obj, 'constructor') && | |
| !_isOwnProp(obj.constructor.prototype, 'isPrototypeOf')) { | |
| return false; | |
| } | |
| // Own properties are enumerated firstly, so to speed up, | |
| // if last one is own, then all properties are own. | |
| for (const key in obj) { | |
| if (key === undefined || !_isOwnProp(obj, key)) { | |
| return false; | |
| } | |
| } | |
| return true; | |
| }; | |
| const _isPrimitiveType = (obj: any): boolean => { | |
| return !(_isTypeOf(obj, 'object') || _isTypeOf(obj, 'function')); | |
| }; | |
| const _prepareClone = (copy: any, src: any): any => { | |
| if (_isClass(copy, 'Array')) { | |
| return _isClass(src, 'Array') ? src : []; | |
| } else { | |
| return _isPlainObj(src) ? src : {}; | |
| } | |
| }; | |
| const _findValue = (deep: boolean, copy: any, src: any): any => { | |
| // if we're merging plain objects or arrays | |
| if (deep && (_isClass(copy, 'Array') || _isPlainObj(copy))) { | |
| const clone = _prepareClone(copy, src); | |
| return extend(deep, clone, copy); | |
| } else { | |
| return copy; | |
| } | |
| }; |
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