scootloops/__tests__/filterIt.test.js

Advanced JavaScript iteration utilities providing powerful patterns for array operations, async flows, tree traversal, and performance optimization not available in native JavaScript.

import { filterIt } from '../src/index.js';

describe('filterIt', () => {
	const testArray = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10];

	it('should filter the array based on the "even" condition', () => {
		const result = filterIt(testArray, 'even');
		expect(result).toEqual([2, 4, 6, 8, 10]);
	});

	it('should filter the array based on the "odd" condition', () => {
		const result = filterIt(testArray, 'odd');
		expect(result).toEqual([1, 3, 5, 7, 9]);
	});

	it('should filter the array based on the "greaterThan" condition', () => {
		const result = filterIt(testArray, 'greaterThan', 5);
		expect(result).toEqual([6, 7, 8, 9, 10]);
	});

	it('should filter the array based on the "lessThan" condition', () => {
		const result = filterIt(testArray, 'lessThan', 5);
		expect(result).toEqual([1, 2, 3, 4]);
	});

	it('should filter the array based on the "startsWith" condition', () => {
		const testArray2 = ['apple', 'banana', 'cherry', 'date'];
		const result = filterIt(testArray2, 'startsWith', 'a');
		expect(result).toEqual(['apple']);
	});

	it('should filter the array based on the "endsWith" condition', () => {
		const testArray2 = ['apple', 'banana', 'cherry', 'date'];
		const result = filterIt(testArray2, 'endsWith', 'e');
		expect(result).toEqual(['apple', 'date']);
	});

	it('should filter the array based on the "contains" condition', () => {
		const testArray2 = ['apple', 'banana', 'cherry', 'date'];
		const result = filterIt(testArray2, 'contains', 'a');
		expect(result).toEqual(['apple', 'banana', 'date']);
	});

	it('should filter the array based on the "isObject" condition', () => {
		const testArray2 = [1, 'two', { name: 'Alice', age: 25 }];
		const result = filterIt(testArray2, 'isObject');
		expect(result).toEqual([{ name: 'Alice', age: 25 }]);
	});

	it('should filter the array based on the "isClass" condition', () => {
		class Person {
			constructor() {}
		}
		const testArray2 = [1, 'two', new Person()];
		const result = filterIt(testArray2, 'isClass');
		expect(result).toEqual([new Person()]);
	});

	it('should filter the array based on the "isArray" condition', () => {
		const testArray2 = [1, 'two', [1, 2, 3]];
		const result = filterIt(testArray2, 'isArray');
		expect(result).toEqual([[1, 2, 3]]);
	});

	it('should filter the array based on the "isNumber" condition', () => {
		const testArray2 = [1, 'two', 3.14];
		const result = filterIt(testArray2, 'isNumber');
		expect(result).toEqual([1, 3.14]);
	});

	it('should filter the array based on the "isString" condition', () => {
		const testArray2 = [1, 'two', 3.14];
		const result = filterIt(testArray2, 'isString');
		expect(result).toEqual(['two']);
	});

	it('should filter the array based on a condition with no value specified', () => {
		const result = filterIt(testArray, 'odd', undefined);
		expect(result).toEqual([1, 3, 5, 7, 9]);
	});

	it('should handle the case where the value is a string that should be converted to a number', () => {
		const result = filterIt(testArray, 'greaterThan', '5');
		expect(result).toEqual([6, 7, 8, 9, 10]);
	});

	it('should handle the case where the value is a string that should be treated as a string', () => {
		const testArray2 = ['apple', 'banana', 'cherry', 'date'];
		const result = filterIt(testArray2, 'contains', 'an');
		expect(result).toEqual(['banana']);
	});
});