class List {
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constructor () {
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this.dataSouce = []
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}
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add (index, element) {
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if (!index) {
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this.addEnd(element)
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} else if (index >= this.dataSouce.length) {
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this.addEnd(element)
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} else if (index === 1) {
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this.addFront(element)
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} else {
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this._add(index, element)
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}
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}
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/**
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* 在列表的末尾添加新元素
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* @param {*} element 要添加的元素
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*/
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addEnd (element) {
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this.dataSouce[this.dataSouce.length] = element
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}
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/**
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* 在列表头部添加新元素
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* @param {*} element
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* @param {*} after
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*/
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addFront (element) {
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this._add(0, element)
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}
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_add (index, element) {
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const newArr = []
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for (var i = this.dataSouce.length - 1; i > index - 1; i--) {
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newArr[i + 1] = this.dataSouce[i]
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}
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newArr[index] = element
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this.dataSouce = newArr
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}
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/**
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* 在列表中移除一个元素
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* @param {*} element 要删除的元素
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*/
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remove (element) {
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// 查找当前元素的索引
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const index = this.dataSouce.indexOf(element)
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if (index >= 0) {
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this.dataSouce.splice(index, 1)
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return true
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}
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return false
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}
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/**
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* 判断给定的值是否在列表中
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*/
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contains (element) {
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return this.dataSouce.indexOf(element) > -1
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}
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/**
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* 清楚列表中的元素
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*/
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clear () {
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delete this.dataSouce
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this.dataSouce = []
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}
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/**
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* 列表的长度
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*/
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length () {
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return this.dataSouce.length
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}
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join (comma) {
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this.removeBlank()
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return this.dataSouce.join(comma)
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}
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removeBlank () {
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const arr = this.dataSouce
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console.log(arr)
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for (const k in arr) {
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if (!arr[k]) {
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this.dataSouce.splice(k, 1)
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}
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}
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}
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}
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export default List
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