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。