Sort an array of objects by dynamically provided list of object properties in a order by then by style

Question

How to write a generic sorting function in the style orderBy thenBy that sort an array by a list of properties provided as an array.

Answer 1

You could iterate the keys and use Array#some for getting the order value.

This proposal works with a short circuit, if a delta is truthy (!== 0), then the iteration breaks and the delta is returned to the sort callback.

function sortByThenBy(array, keys) {
    return array.sort(function (a, b) {
        var r = 0;
        keys.some(function (k) {
            return r = a[k] - b[k];
        });
        return r;
    });
}

var items = [{ name: "AA", prop1: 12, prop2: 13, prop3: 5, prop4: 22 }, { name: "AA", prop1: 12, prop2: 13, prop3: 6, prop4: 23 }, { name: "AA", prop1: 12, prop2: 14, prop3: 5, prop4: 23 }, { name: "AA", prop1: 11, prop2: 13, prop3: 5, prop4: 22 }, { name: "AA", prop1: 10, prop2: 13, prop3: 9, prop4: 21 }];

console.log(sortByThenBy(items, ["prop1", "prop3", "prop4"]));
console.log(sortByThenBy(items, ["prop1", "prop3"]));
console.log(sortByThenBy(items, ["prop3", "prop1", "prop4"]));

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