Rediscovering JavaScript

Chapter 2

Here are the solutions to the ​Exercises​, for the Chapter 2, ​Variables and Constants​ chapter.

Exercise 1

The program will not terminate. It will output 0, 1, 2, 0, 1, 2,… forever until you terminate the program out of boredom.

Exercise 2

'use strict';

function first() {
  for(let i = 0; i < 5; i++) {
    second();
  }
}

function second() {
  for(let i = 0; i < 3; i++) {
    console.log(i);
  }
}

first();

Exercise 3

Runs the code in struct mode. Detects undeclared variables, errors due to setting read-only properties, and the use of any reserved keywords.

Exercise 4

Yes. The const field cannot be changed.

Exercise 5

No. Freeze is not deep. Only the top-level object is read-only. The program changes an object at a ...