ts-prime/dist/es/times.test.js

A utility library for JavaScript and Typescript.

import { times } from './times';
describe('times', function () {
    describe('data_first', function () {
        it('throws error on invalid idx', function () {
            var noop = function () { return undefined; };
            expect(function () { return times(-1, noop); }).toThrow();
            expect(function () { return times(-1000, noop); }).toThrow();
            expect(function () { return times(Number.MIN_SAFE_INTEGER, noop); }).toThrow();
        });
        it('returns empty array', function () {
            var noop = function () { return undefined; };
            var res = times(0, noop);
            expect(res).toEqual([]);
        });
        it('returns arr with fn result', function () {
            var one = function () { return 1; };
            expect(times(1, one)).toEqual([1]);
            expect(times(5, one)).toEqual([1, 1, 1, 1, 1]);
        });
        it('passes idx to fn', function () {
            var fn = jest.fn();
            times(5, fn);
            expect(fn).toHaveBeenCalledWith(0);
            expect(fn).toHaveBeenCalledWith(1);
            expect(fn).toHaveBeenCalledWith(2);
            expect(fn).toHaveBeenCalledWith(3);
            expect(fn).toHaveBeenCalledWith(4);
        });
        it('returns fn results as arr', function () {
            var idx = function (idx) { return idx; };
            expect(times(5, idx)).toEqual([0, 1, 2, 3, 4]);
            var mul2 = function (idx) { return idx * 2; };
            expect(times(5, mul2)).toEqual([0, 2, 4, 6, 8]);
        });
    });
    describe('data_last', function () {
        it('throws error on invalid idx', function () {
            var noop = function () { return undefined; };
            var noopTimes = times(noop);
            expect(function () { return noopTimes(-1); }).toThrow();
            expect(function () { return noopTimes(-1000); }).toThrow();
            expect(function () { return noopTimes(Number.MIN_SAFE_INTEGER); }).toThrow();
        });
        it('returns empty array', function () {
            var noop = function () { return undefined; };
            var res = times(noop)(0);
            expect(res).toEqual([]);
        });
        it('returns arr with fn result', function () {
            var one = function () { return 1; };
            var oneTime = times(one);
            expect(oneTime(1)).toEqual([1]);
            expect(oneTime(5)).toEqual([1, 1, 1, 1, 1]);
        });
        it('passes idx to fn', function () {
            var fn = jest.fn();
            times(fn)(5);
            expect(fn).toHaveBeenCalledWith(0);
            expect(fn).toHaveBeenCalledWith(1);
            expect(fn).toHaveBeenCalledWith(2);
            expect(fn).toHaveBeenCalledWith(3);
            expect(fn).toHaveBeenCalledWith(4);
        });
        it('returns fn results as arr', function () {
            var idx = function (idx) { return idx; };
            expect(times(idx)(5)).toEqual([0, 1, 2, 3, 4]);
            var mul2 = function (idx) { return idx * 2; };
            expect(times(mul2)(5)).toEqual([0, 2, 4, 6, 8]);
        });
    });
});