How to Sort a 2D Array by Column Value in JavaScript?

Sorting 2D Arrays in JavaScript

How can I sort a 2D array by column value in JavaScript?

Suppose we have a 2D array with the following format:

[[12, "AAA"], [58, "BBB"], [28, "CCC"], [18, "DDD"]]

We want to sort this array by the first column, resulting in:

[[12, "AAA"], [18, "DDD"], [28, "CCC"], [58, "BBB"]]

Solution:

Sorting a 2D array by column value is straightforward in JavaScript. Here's how you can do it:

var a = [[12, 'AAA'], [58, 'BBB'], [28, 'CCC'],[18, 'DDD']];

a.sort(sortFunction);

function sortFunction(a, b) {
    if (a[0] === b[0]) {
        return 0;
    }
    else {
        return (a[0] < b[0]) ? -1 : 1;
    }
}

This function uses the following rules:

• If the elements in the first column are equal, return 0.
• If the element in the first column of the first array is less than that of the second, return -1.
• If the element in the first column of the first array is greater than that of the second, return 1.

To sort the array by the second column, simply replace a[0] with a[1] in the comparison function.

a.sort(compareSecondColumn);

function compareSecondColumn(a, b) {
    if (a[1] === b[1]) {
        return 0;
    }
    else {
        return (a[1] < b[1]) ? -1 : 1;
    }
}

Refer to the JavaScript documentation for more information on the sort function.

The above is the detailed content of How to Sort a 2D Array by Column Value in JavaScript?. For more information, please follow other related articles on the PHP Chinese website!