JS实现的字符串数组去重功能小结

2019-11-19 11:19:50

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本文实例讲述了JS实现的字符串数组去重功能。分享给大家供大家参考，具体如下：

这里只考虑最简单字符串的数组去重，暂不考虑，对象，函数，NaN等情况，这种用正则实现起来就吃力不讨好了。

非正则实现：ES6实现

<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>

运行结果：

ES5实现

<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>

运行结果同上

ES3实现

<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>

运行结果同上

用正则实现

<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>

运行结果：