difference

difference.test.ts
import { difference } from "../../utility/array/difference";
​
describe('difference tests', () => {
  test('difference should receive an array being composed of number and return the processed array', () => {
    const received = {
      origin: [1, 2, 3, 4, 5],
      filter: [1, 4],
    };
    const expected = [2, 3, 5];
​
    const result = difference<number>(received.origin, ...received.filter);
​
    for (const [i, v] of result.entries()) {
      expect(v).toBe(expected[i]);
    }
  });
​
  test('difference should return a new array', () => {
    const received = {
      origin: [100, 200, 300, 300, 500],
      filter: [300],
    };
    const expected = [100, 200, 500];
​
    const result = difference<number>(received.origin, ...received.filter);
​
    for (const [i, v] of result.entries()) {
      expect(v).toBe(expected[i]);
    }
​
    received.origin.push(800);
​
    for (const [i, v] of result.entries()) {
      expect(v).toBe(expected[i]);
    }
  });
​
  test('difference should receive an array being composed of any value and return a new array', () => {
    const received = {
      origin: [null, undefined, NaN, '', 0, false, function () { }, {}, []],
      filter: [function () { }, [], null],
    };
    const expected = [undefined, NaN, '', 0, false, function () { }, {}, []];
​
    const result = difference<any>(received.origin, ...received.filter);
​
    expect(result.length).toBe(expected.length);
  });
});