[英]sort multidimensional array javascript
I would like to sort a multidimensional array of doubles. 我想对多维数组进行排序。
The array looks like this : [[1,2],[2,3],[5,6],[8,9]] 数组看起来像这样:[[1,2],[2,3],[5,6],[8,9]]
I would like to sort it by the X value, and keep the x,y values paired. 我想按X值对其进行排序,并保持x,y值配对。
I searched the site for multidimentional sorting and found threads like these where the sort function is modified like so: 我在网站上搜索了多维分类,并找到了像这样的线程,其中sort函数被修改如下:
location.sort(function(a,b) {
// assuming distance is always a valid integer
return parseInt(a.distance,10) - parseInt(b.distance,10);
});
I'm not sure how to modify this function to work for me, however. 但是,我不知道如何修改此功能以便为我工作。
Just compare the array values - 只需比较数组值 -
var myarray = [[1,2],[2,3],[5,6],[8,9]];
myarray.sort(function(a,b) { return a[0] - b[0]; });
You just need to compare the parts of a
and b
that you want to. 你只需要比较你想要的
a
和b
部分。 With numbers you can use their difference: 使用数字,您可以使用它们的区别:
location.sort(function(a, b){
return a[0] - b[0];
});
Note that the array you provided already is sorted by the first value in each array. 请注意,您提供的数组已按每个数组中的第一个值排序。 If you want to sort in descending order instead you can do this:
如果您想按降序排序,则可以执行以下操作:
location.sort(function(a, b){
return b[0] - a[0];
});
The safest way of achieving this is to do what you have in your question, but with numeric keys: 实现这一目标最安全的方法是在您的问题中执行您的操作,但使用数字键:
location.sort(function(a,b) { return a[0]-b[0]; })
If by some chance the first element of each child array is always a single digit : 如果有可能每个子数组的第一个元素总是一个数字 :
location.sort();
//only works if first element in child arrays are single digit (0-9)
//as in the example: [[1,2],[2,3],[5,6],[8,9]]
//[[1,2],[22,3],[5,6],[8,9]] - will not work as 22 is not a single digit
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