Sort an array by string, number, or date with support for ascending and descending order

sort-array.js

function compareDefault(a, b) {
    return a - b;
}

function compareStrings(a, b) {
    a = String(a).toUpperCase();
    b = String(b).toUpperCase();
    if (a > b) {
        return 1;
    }
    if (a < b) {
        return -1;
    }
    return 0;
}

function compareNumbers(a, b) {
    a = typeof a === 'number' ? a : parseFloat(a, 10);
    b = typeof b === 'number' ? b : parseFloat(b, 10);
    return (Number.isNaN(a) ? 0 : a) - (Number.isNaN(b) ? 0 : b);
}

function compareDates(a, b) {
    a = typeof a === 'string' ? Date.parse(a) : a.getTime();
    b = typeof b === 'string' ? Date.parse(b) : b.getTime();
    return (Number.isNaN(a) ? 0 : a) - (Number.isNaN(b) ? 0 : b);
}

function getComparator(type) {
    if (typeof type === 'function') {
        return type;
    }
    if (type === 'string') {
        return compareStrings;
    }
    if (type === 'number') {
        return compareNumbers;
    }
    if (type === 'date') {
        return compareDates;
    }
}

function sort(array, type = compareDefault, dir = 'ASC') {
    const compare = getComparator(type);
    array.sort(dir === 'ASC' ? compare : (a, b) => ~compare(a, b) + 1);
}

// Usage:

const items = [
    10.5,
    10.2,
    20,
    5.5,
    2,
    50,
    5
];

sort(items, 'number', 'DESC');