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How to implement string deduplication and array deduplication using JS

不言Original: 2018-04-21 16:16:383106browse

This article mainly introduces the method of JS to achieve string deduplication and array deduplication, involving JavaScript's traversal, judgment, deletion, addition and other related operation skills for strings and arrays. Friends in need can refer to it

The example in this article describes the method of JS to implement string deduplication and array deduplication. Share it with everyone for your reference, the details are as follows:

<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>www.jb51.net js数组、字符串去重</title>
</head>
<body>
  <script type="text/javascript">
  /*数组去重*/
    function quchong(arr){
      var len = arr.length;
      arr.sort();
      for(var i=len-1;i>0;i--){
        if(arr[i]==arr[i-1]){
          arr.splice(i,1);
        }
      }
      return arr;
    }
    var a = ["a","a","b",&#39;b&#39;,&#39;c&#39;,&#39;c&#39;,&#39;a&#39;,&#39;d&#39;];
    var b = quchong(a);
    console.log(b);
  /*字符串去重*/
  function quchongstr(str){
    var a = str.match(/\S+/g);//等价于str.split(/\s+/g)// \s空白符，\S非空白符
    a.sort();
    for(var i=a.length-1;i>0;i--){
      if(a[i]==a[i-1]){
        a.splice(i,1);
      }
    }
    return a.join(" ");
  }
  var str = quchongstr("a a b a b e");
  console.log(str);
  </script>
</body>
</html>

Running results:

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