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

<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 + typeof arr[i]
if (!obj[key]) {
obj[key] = true
array.push(arr[i])
}
}
return array
}
console.log(unique(str_arr))
</script>

<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>

• JS
• 字符串数组
• 去重