以与另一个数组相同的顺序对数组进行排序 [英] Sort an array in the same order of another array

问题描述

我有一些包含 50 多个这样的名字的数组.

["dan", "ryan", "bob", "steven", "corbin"][鲍勃"、丹"、史蒂文"、科尔宾"]

我有另一个具有正确顺序的数组.请注意，上面的第二个数组不包括所有名称，但我仍然希望它遵循以下顺序:

["ryan", "corbin", "dan", "steven", "bob"]

它没有逻辑顺序，它们只是按照这个顺序.对我来说有意义的是将每个数组与正确排序的数组进行比较.我想我看到有些人用 PHP 做这件事，但我找不到 JavaScript 解决方案.有谁知道如何做到这一点?我已经尝试了几个小时，但被难住了.

解决方案

使用 indexOf() 获取每个元素在引用数组中的位置，并在您的比较函数中使用.>

var reference_array = ["ryan", "corbin", "dan", "steven", "bob"];var array = ["bob", "dan", "steven", "corbin"];数组排序(函数(a，b){返回 reference_array.indexOf(a) - reference_array.indexOf(b);});控制台日志(数组)；//["corbin", "dan", "steven", "bob"]

每次搜索参考数组对于大数组来说效率很低.如果这是一个问题，您可以将其转换为将名称映射到位置的对象:

var reference_array = ["ryan", "corbin", "dan", "steven", "bob"];参考对象 = {};for (var i = 0; i 

I have a few arrays of 50+ names like this.

["dan", "ryan", "bob", "steven", "corbin"]
["bob", "dan", "steven", "corbin"]

I have another array that has the correct order. Note that the second array above does not include all of the names, but I still want it to follow the order of the following:

["ryan", "corbin", "dan", "steven", "bob"]

There is no logical order to it, they are just in this order. What makes sense to me is to compare each array against the correctly ordered one. I think I saw some people doing this with PHP, but I was not able to find a JavaScript solution. Does anyone have any idea how to do this? I've been trying for a few hours and I'm stumped.

解决方案

Use indexOf() to get the position of each element in the reference array, and use that in your comparison function.

var reference_array = ["ryan", "corbin", "dan", "steven", "bob"];
var array = ["bob", "dan", "steven", "corbin"];
array.sort(function(a, b) {
  return reference_array.indexOf(a) - reference_array.indexOf(b);
});
console.log(array); // ["corbin", "dan", "steven", "bob"]

Searching the reference array every time will be inefficient for large arrays. If this is a problem, you can convert it into an object that maps names to positions:

var reference_array = ["ryan", "corbin", "dan", "steven", "bob"];
reference_object = {};
for (var i = 0; i < reference_array.length; i++) {
    reference_object[reference_array[i]] = i;
}
var array = ["bob", "dan", "steven", "corbin"];
array.sort(function(a, b) {
  return reference_object[a] - reference_object[b];
});
console.log(array);

这篇关于以与另一个数组相同的顺序对数组进行排序的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！