制作小程序的好处_JS完成的字符串数组去重功用小结

JS实现的字符串数组去重功能小结       这篇文章主要介绍了JS实现的字符串数组去重功能,结合实例形式分析了javascript基于ES6、ES5、ES3及正则实现数组去重的相关操作技巧,需要的朋友可以参考下

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:

感兴趣的朋友可以使用在线HTML/CSS/JavaScript代码运行工具:测试上述代码运行效果。

凡科抠图:这里再为大家提供几款相关工具供大家参考使用:

在线去除重复项工具:

在线文本去重复工具:

更多关于JavaScript相关内容还可查看本站专题:《》、《》、《》、《》、《》、《》及《》

希望本文所述对大家JavaScript程序设计有所帮助。


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