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@@ -16,10 +16,140 @@ function unique(arr){
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}
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/**
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- * 集合法
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+ * 集合法去重
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* @param {*} arr
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* @returns
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*/
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function unique2(arr){
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return [...new Set(arr)]
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+}
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+
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+/**
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+ * 数组合并
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+ * @param {*} arr
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+ * @param {...any} args
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+ * @returns
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+ */
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+function concat(arr,...args){
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+ const result = [...arr]
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+ args.forEach(item=>{
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+ if(Array.isArray(item)){
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+ result.push(...item)
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+ }else{
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+ result.push(item)
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+ }
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+ })
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+ return result
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+}
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+
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+/**
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+ * 切片
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+ * @param {*} arr
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+ * @param {*} start
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+ * @param {*} end
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+ * @returns
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+ */
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+function slice(arr,start,end){
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+ if(arr.length <= 0) return []
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+ start = start || 0
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+ if(start >= arr.length) return []
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+ end = end || arr.length
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+ if(start >= end) end = arr.length
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+ const result = []
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+ arr.forEach((item,index)=>{
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+ if(index >= start && index < end){
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+ result.push(item)
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+ }
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+ })
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+ return result
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+}
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+
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+/**
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+ * 将多维数组变为一维数组 1
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+ * @param {*} arr
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+ * @returns
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+ */
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+function flatten1(arr){
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+ let result = []
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+ arr.forEach(item=>{
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+ if(Array.isArray(item)){
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+ result = result.concat(flatten1(item))
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+ }else{
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+ result = result.concat(item)
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+ }
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+ })
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+ return result
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+}
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+
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+/**
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+ * 将多维数组变为一维数组 2
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+ * @param {*} arr
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+ * @returns
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+ */
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+function flatten2(arr){
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+ let result = [...arr]
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+ while(result.some(item=>Array.isArray(item))){
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+ result = [].concat(...result) // concat 可以把元素放入数组 示例：[].concat(1,2,[3,4]) => [1,2,3,4]
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+ }
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+ return result
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+}
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+
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+/**
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+ * 数组分组
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+ * @param {*} arr
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+ * @param {*} size
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+ * @returns
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+ */
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+function chunk(arr,size = 1){
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+ if(arr.lenght === 0) return []
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+ let result = []
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+ let tmp = []
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+ arr.forEach(item=>{
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+ if(tmp.length === 0){
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+ result.push(tmp)
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+ }
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+ tmp.push(item)
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+ if(tmp.length === size){
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+ tmp = []
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+ }
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+ })
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+ return result
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+}
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+/**
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+ * 差
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+ * @param {*} arr
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+ * @param {*} arr1
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+ * @returns
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+ */
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+function diffrence(arr,arr1){
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+ return arr.filter(item=>!arr1.includes(item))
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+}
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+
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+/**
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+ * 删除数组元素，并返回删掉的元素
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+ * @param {*} arr
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+ * @param {...any} args
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+ * @returns
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+ */
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+function pull(arr,...args){
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+ const result = []
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+ for(let i = 0;i<arr.length;i++){
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+ if(args.includes(arr[i])){
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+ result.push(arr[i])
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+ arr.splice(i,1)
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+ i--
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+ }
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+ }
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+ return result
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+}
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+/**
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+ * 不改变原数组 获取右侧元素
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+ * @param {*} arr
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+ * @param {*} size
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+ * @returns
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+ */
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+function drop(arr,size){
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+ return arr.filter((item,index)=>{
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+ return index >= size
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+ })
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}
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