Typed Immutable Sort

immutableSort.ts

export const immutableSort = <T>(array: T[], comparatorFn?: (a: T, b: T) => number): T[] =>
    [...array].sort(comparatorFn);

describe('immutableSort', () => {
    const testData = [4, 2, 5, -1, 0];
    it('can sort an array', () => {
        const result = immutableSort(testData);
        expect(result).toStrictEqual([-1, 0, 2, 4, 5]);
    });

    it('does not modify the original array', () => {
        const _ = immutableSort(testData);
        expect(testData).toStrictEqual([4, 2, 5, -1, 0]);
    });
});