How to Sort an Array of Objects by Multiple Fields?

How to Sort an Array of Objects by Multiple Fields

Sorting an array of objects by multiple fields can be achieved by chaining multiple comparison functions.

Example

Consider the following array of objects representing homes:

var homes = [
    {"h_id":"3",
     "city":"Dallas",
     "state":"TX",
     "zip":"75201",
     "price":"162500"},
    {"h_id":"4",
     "city":"Bevery Hills",
     "state":"CA",
     "zip":"90210",
     "price":"319250"},
    {"h_id":"6",
     "city":"Dallas",
     "state":"TX",
     "zip":"75000",
     "price":"556699"},
    {"h_id":"5",
     "city":"New York",
     "state":"NY",
     "zip":"00010",
     "price":"962500"}
    ];

To sort this array by city (ascending) and then by price (descending), use the following approach:

homes.sort(function (a, b) {
    // Compare city fields
    var cityDelta = a.city.localeCompare(b.city);
    if (cityDelta !== 0) {
        // If cities differ, return comparison result
        return cityDelta;
    }
    // If cities are the same, compare prices in descending order
    return b.price - a.price;
});

General Approach

This approach can be generalized to any number of sorting fields. Iterate through the desired sorting fields in the desired order, and compare the values for each field. If a non-zero delta is found, return the result; otherwise, continue to the next field.

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