JS實現(xiàn)的字符串數(shù)組去重功能小結

更新時間：2019年06月17日 09:47:29 作者：longzhoufeng

這篇文章主要介紹了JS實現(xiàn)的字符串數(shù)組去重功能,結合實例形式分析了javascript基于ES6、ES5、ES3及正則實現(xiàn)數(shù)組去重的相關操作技巧,需要的朋友可以參考下

本文實例講述了JS實現(xiàn)的字符串數(shù)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(shù)組去重，暫不考慮，對象，函數(shù)，NaN等情況，這種用正則實現(xiàn)起來就吃力不討好了。

非正則實現(xiàn)：ES6實現(xiàn)

<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(xiàn)

<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(xiàn)

<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(xiàn)

<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：