Javascript数组排序和唯一 [英] Javascript array sort and unique

问题描述

我有一个这样的 JavaScript 数组:

I have a JavaScript array like this:

var myData=['237','124','255','124','366','255'];

我需要数组元素是唯一的和排序的:

I need the array elements to be unique and sorted:

myData[0]='124';
myData[1]='237';
myData[2]='255';
myData[3]='366';

尽管数组的成员看起来像整数，但它们不是整数，因为我已经将每个成员都转换为字符串:

Even though the members of array look like integers, they're not integers, since I have already converted each to be string:

var myData[0]=num.toString();
//...and so on.

有没有办法在 JavaScript 中完成所有这些任务?

Is there any way to do all of these tasks in JavaScript?

推荐答案

这其实很简单.如果先对值进行排序，则查找唯一值会容易得多:

This is actually very simple. It is much easier to find unique values, if the values are sorted first:

function sort_unique(arr) {
  if (arr.length === 0) return arr;
  arr = arr.sort(function (a, b) { return a*1 - b*1; });
  var ret = [arr[0]];
  for (var i = 1; i < arr.length; i++) { //Start loop at 1: arr[0] can never be a duplicate
    if (arr[i-1] !== arr[i]) {
      ret.push(arr[i]);
    }
  }
  return ret;
}
console.log(sort_unique(['237','124','255','124','366','255']));
//["124", "237", "255", "366"]

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