1 class MySet { 2 constructor(params) { 3 if (typeof params[Symbol.iterator] !== ‘function‘) { 4 throw new TypeError(‘Set的参数不是一个可以迭代的对象‘) 5 } 6 this._data = [] 7 for (var item of params) { 8 this.add(item) 9 } 10 } 11
12 //添加元素
13 add(data) { 14 if(!this.has(data)) { 15 this._data.push(data) 16 } 17 } 18 //判断是否含有该元素
19 has (data) { 20 for (let index = 0; index < this._data.length; index++) { 21 const element = this._data[index]; 22 if(this.isEqual(element,data)) { 23 return true
24 } 25 } 26 return false
27 } 28 delete (data) { 29 for (let index = 0; index < this._data.length; index++) { 30 const element = this._data[index]; 31 if(this.isEqual(data,element)) { 32 this._data.splice(index, 1) 33 return true
34 } 35 } 36 return false
37 } 38 forEach(callback) { 39 for (const item of this._data) { 40 callback(item, item, this) 41 } 42 } 43 *[Symbol.iterator] () { 44 for(let item of this._data) { 45 yield item 46 } 47 } 48 clear () { 49 this._data = [] 50 } 51 /** 52 * 判断两个数是否相等 53 * @param {*} data1 54 * @param {*} data2 55 */
56
57 isEqual(data1, data2) { 58 if(data1 === 0 && data2 === 0) { 59 return true
60 } 61 return Object.is(data1, data2) 62 } 63 }
