JS實現的字符串數組去重功能小結

2019-11-19 11:19:50

字體：大中小

來源：轉載

供稿：網友

本文實例講述了JS實現的字符串數組去重功能。分享給大家供大家參考，具體如下：

這里只考慮最簡單字符串的數組去重，暫不考慮，對象，函數，NaN等情況，這種用正則實現起來就吃力不討好了。

非正則實現：ES6實現

<script>let str_arr=["b","c",1,"a", 3,"v", "2","e", "6","g", "9", "arr",9, "hello",",6", "9", "1", 2, 6, "b", "c"]function unique(arr){ return [...new Set(arr)]}console.log(unique(str_arr)) </script>

運行結果：

ES5實現

<script>var str_arr = ["b","c",1,"a", 3,"v", "2","e", "6","g", "9", "arr",9, "hello",",6", "9", "1", 2, 6, "b", "c"]  function unique(arr) {    return arr.filter(function(ele, index, array) {      return array.indexOf(ele) === index    })  }  console.log(unique(str_arr))</script>

運行結果同上

ES3實現

<script>var str_arr = ["b","c",1,"a", 3,"v", "2","e", "6","g", "9", "arr",9, "hello",",6", "9", "1", 2, 6, "b", "c"]function unique(arr) {  var obj = {},    array = []  for (var i = 0, len = arr.length; i < len; i++) {    var key = arr[i] + typeof arr[i]    if (!obj[key]) {      obj[key] = true      array.push(arr[i])    }  }  return array}console.log(unique(str_arr))</script>

運行結果同上

用正則實現

<script> var str_arr = ["b","c",1,"a", 3,"v", "2","e", "6","g", "9", "arr",9, "hello",",6", "9", "1", 2, 6, "b", "c"] function unique(arr) {   return arr.sort().join(",,").   replace(/(,|^)([^,]+)(,,/2)+(,|$)/g, "$1$2$4").   replace(/,,+/g, ",").   replace(/,$/, "").   split(",") } console.log(unique(str_arr))</script>

運行結果：