JS实现的字符串数组去重功能小结
编程学习 2021-07-04 15:51www.dzhlxh.cn编程入门
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。
PS: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。