How to Sort a Two-Dimensional Array by Column Value in JavaScript?

Sorting a Two-Dimensional Array by Column Value in JavaScript

To sort a 2D array by its column values in JavaScript, you can use the Array.sort() method with a custom comparison function. This function compares the elements in the specified column and determines the sort order.

Consider the following example:

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

To sort this array by the first column, you can use the following code:

a.sort(sortFunction);

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

The sortFunction compares the first elements of the two rows being compared (a[0] and b[0]) and returns -1 if the first element of a is less than the first element of b, 1 if it is greater than, and 0 if they are equal. This defines the sort order, and the Array.sort() method will arrange the array accordingly.

To sort by the second column, you can modify the sort function:

a.sort(compareSecondColumn);

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

This function compares the second elements of the rows being compared. Using these methods, you can easily sort a 2D array by any column value in JavaScript.

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