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

Sorting a 2D Array by Column Value in JavaScript

Problem:
How can I sort a 2D array in JavaScript based on the values in a specific column?

Code Snippet:
To sort a 2D array by the first column, use the following code:

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;
    }
}

Explanation:
The sort() method sorts an array in place. In this case, we pass a sortFunction that compares the first elements of the two arrays a and b and returns -1 if a should come before b, 1 if b should come before a, or 0 if they are equal.

Sorting by the Second Column:
To sort by the second column, replace the sortFunction with the following:

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

Output:
The sorted array will look like this:

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

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