排序外阵列的基础上的内部数组值，JavaScript的 [英] sort outer array based on values in inner array, javascript

问题描述

我有阵列它，在这里我想基于在内部特定的列值外数组排序的数组。

I have an array with arrays in it, where I want to sort the outer arrays based on values in a specific column in the inner.

我敢打赌，听起来多了有点混乱，所以我就直接跳到一个例子。

I bet that sounded more than a bit confusing, so I'll skip straight to an example.

初始数据：

var data = [
  [
    "row_1-col1",
    "2-row_1-col2",
    "c-row_1-coln"
  ],
  [
    "row_2-col1",
    "1-row_2-col2",
    "b-row_2-coln"
  ],
  [
    "row_m-col1",
    "3-row_m-col2",
    "a-row_m-coln"
  ]
];

排序数据的基础上，列有索引1

data.sortFuncOfSomeKind(1);

在对象则是这样的;

where the object then would look like this;

var data = [
  [
    "row_2-col1",
    "1-row_2-col2",
    "b-row_2-coln"
  ],
  [
    "row_1-col1",
    "2-row_1-col2",
    "c-row_1-coln"
  ],
  [
    "row_m-col1",
    "3-row_m-col2",
    "a-row_m-coln"
  ]
];

排序数据的基础上，列有索引2

data.sortFuncOfSomeKind(2);

在对象则是这样的;

where the object then would look like this;

var data = [
  [
    "row_m-col1",
    "3-row_m-col2",
    "a-row_m-coln"
  ],
  [
    "row_2-col1",
    "1-row_2-col2",
    "b-row_2-coln"
  ],
  [
    "row_1-col1",
    "2-row_1-col2",
    "c-row_1-coln"
  ]
];

的大Q

有没有一个现有的解决方案，这一点，你知道的，或者我会写一个自己？如果是这样，这将是最容易排序算法使用？快速排序？

Is there an existing solution to this that you know of, or would I have to write one myself? If so, which would be the easiest sort algorithm to use? QuickSort?

_L

推荐答案

阵列＃排序（见的规范或的 MDC ）接受一个可选功能参数将被用来比较两个条目排序。该函数将返回-1，如果第一个参数是小于第二，0如果他们是平等的，或者1如果第一个是大于第二个。所以：

Array#sort (see section 15.4.4.11 of the spec, or MDC) accepts an optional function parameter which will be used to compare two entries for sorting purposes. The function should return -1 if the first argument is "less than" the second, 0 if they're equal, or 1 if the first is "greater than" the second. So:

outerArray.sort(function(a, b) {
    var valueA, valueB;

    valueA = a[1]; // Where 1 is your index, from your example
    valueB = b[1];
    if (valueA < valueB) {
        return -1;
    }
    else if (valueA > valueB) {
        return 1;
    }
    return 0;
});

（可以很明显的COM preSS是codeA位。我已经把它详细的清晰度）

(You can obviously compress that code a bit; I've kept it verbose for clarity.)

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