js 对一个字段去重_JS实现的字符串数组去重功能小结

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

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))

运行结果:

ES5实现

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))

运行结果同上

ES3实现

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))

运行结果同上

用正则实现

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))

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:http://tools.jb51.net/code/HtmlJsRun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:

希望本文所述对大家JavaScript程序设计有所帮助。

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