Summary  
This chapter covers how to implement code that generates and prints a sequence of values using loop constructs and control flow.

General domain of usage  
console-based utilities

test("generates first ten even numbers", () => {
  expect(generateEvenNumbers()).toEqual([
    2, 4, 6, 8, 10,
    12, 14, 16, 18, 20
  ]);
});

test("uses correct loop structure", () => {
  const code = generateEvenNumbers.toString();

  expect(code.includes("let i = 1")).toBe(true);
  expect(code.includes("i <= 10")).toBe(true);
  expect(code.includes("i++")).toBe(true);
});

test("uses multiplication to generate evens", () => {
  const code = generateEvenNumbers.toString();
  expect(code.includes("i * 2")).toBe(true);
});


user_code.test.js

Dive into the world of the most popular language for front-end development – JavaScript. JavaScript is a language built into almost every browser and can be used for a wide variety of tasks. Learn the basic functionality and prepare yourself for the challenges and more advanced programming techniques.

An introduction to JavaScript, covering the basic syntax of the language along with key terms and concepts that form the foundation for learning advanced features. The section includes hands-on tasks designed to help practice these concepts and make the content easy to remember without effort.

Challenge: Printing a Sequence

Solution