Course Content

Introduction to JavaScript

1. JavaScript Fundamentals

About JavaScript Understanding JavaScript Syntax Challenge: Console Output in JavaScript Using Comments to Document Code Challenge: Write a Single-Line Comment Challenge: Write a Multi-Line Comment

2. Variables and Data Types in JavaScript

Understanding Variables in JavaScript Challenge: Define the Variable Using const for Constants Exploring JavaScript Data Types Working with null in JavaScript Introduction to Arrays Array Methods and Manipulation Challenge: Perform Array Operations

3. Performing Operations in JavaScript

Understanding Assignment Operators Mathematical Operations in JavaScript Assignment Operators in JavaScript Increment and Decrement Operators Challenge: Variable Operations Practice Comparison Operators in JavaScript Logical Operators Explained Challenge: Compare Variables in JavaScript Concatenating Strings in JavaScript Challenge: Build Sentences with JavaScript

4. Controlling Program Flow with Conditional Statements

Mastering if Statements in JavaScript Using else for Alternative Outcomes Applying else if for Multiple Conditions Challenge: Determine Sizes with Conditionals

5. Looping Through Data in JavaScript

Understanding the while Loop in JavaScript Using the do while Loop for Iteration Challenge: Print Numbers from 5 to 9 Mastering the for Loop in JavaScript Challenge: Console Tigers with Loops Breaking Out of Loops with break Skipping Iterations with continue Challenge: Stop and Skip in Loops

6. Functions in JavaScript

What Are Functions in JavaScript?Defining Functions in JavaScript Challenge: Write a Function – My Name Using Function Arguments Effectively Returning Values from Functions Challenge: Create a Sum Function Course Summary & Next Steps

Mathematical Operations in JavaScript

JavaScript can perform the following operations with numbers:

Addition ( + );
Subtraction ( - );
Multiplication ( * );
Division ( / );
Remainder , or Modulo ( % );
Exponent ( ** ).

Note

If you are already familiar with these operations and how they work, skip to the last section (Priority of Execution of Operations) or proceed with this chapter.

Addition and Subtraction


              123456
            
console.log(25 + 13);  // Addition
console.log(37 - 2);  // Subtraction

let a = 25, b = 23;
console.log(a + b);  // Addition
console.log(a - b);  // Subtraction

Multiplication and Division


              1234567
            
console.log(12 * 3);  // Multiplication
console.log(12 / 3);  // Division
console.log(273 / 23);  // Division

let a = 77, b = 11;
console.log(a * b);  // Multiplication
console.log(a / b);  // Division

Remainder (Modulo)

This operation returns the remainder of a division and is performed using the % operator:


              12345
            
console.log(77 % 10);
console.log(25 % 11);

let a = 27, b = 21;
console.log(a % b);

Exponent

This operation raises a number to a certain power. The first number is the base, and the second is the exponent to which it must be raised. It is performed using the ** operator:


              123456
            
console.log(10 ** 6); // 10 * 10 * 10 * 10 * 10 * 10 (6 times)
console.log(2 ** 7); // 2 * 2 * 2 * 2 * 2 * 2 * 2 (7 times)

let a = 2;
let b = 3;
console.log(a ** b);

Priority of Execution of Operations

Each operation has its execution priority, and the sequence of execution depends on it.

Note

If operations have the same priority, they will be executed from left to right.

You can use parentheses ( ) to modify the priority of execution:


              123
            
console.log(25 + 7 * 2 ** 3); // Example 1
console.log((25 + 7) * 2 ** 3); // Example 2
console.log(((25 + 7) * 2) ** 3); // Example 3

Note

Parentheses () have the highest priority. Inner parentheses are evaluated first, followed by outer ones.

1. What does the `%` operator return in JavaScript?

2. What will be the result of the following expression?

Everything was clear?

Thanks for your feedback!

Section 3. Chapter 2

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Course Content

Introduction to JavaScript

1. JavaScript Fundamentals

About JavaScript Understanding JavaScript Syntax Challenge: Console Output in JavaScript Using Comments to Document Code Challenge: Write a Single-Line Comment Challenge: Write a Multi-Line Comment

2. Variables and Data Types in JavaScript

3. Performing Operations in JavaScript

4. Controlling Program Flow with Conditional Statements

Mastering if Statements in JavaScript Using else for Alternative Outcomes Applying else if for Multiple Conditions Challenge: Determine Sizes with Conditionals

5. Looping Through Data in JavaScript

6. Functions in JavaScript

Mathematical Operations in JavaScript

JavaScript can perform the following operations with numbers:

Addition ( + );
Subtraction ( - );
Multiplication ( * );
Division ( / );
Remainder , or Modulo ( % );
Exponent ( ** ).

Note

If you are already familiar with these operations and how they work, skip to the last section (Priority of Execution of Operations) or proceed with this chapter.

Addition and Subtraction


              123456
            
console.log(25 + 13);  // Addition
console.log(37 - 2);  // Subtraction

let a = 25, b = 23;
console.log(a + b);  // Addition
console.log(a - b);  // Subtraction

Multiplication and Division


              1234567
            
console.log(12 * 3);  // Multiplication
console.log(12 / 3);  // Division
console.log(273 / 23);  // Division

let a = 77, b = 11;
console.log(a * b);  // Multiplication
console.log(a / b);  // Division

Remainder (Modulo)

This operation returns the remainder of a division and is performed using the % operator:


              12345
            
console.log(77 % 10);
console.log(25 % 11);

let a = 27, b = 21;
console.log(a % b);

Exponent

This operation raises a number to a certain power. The first number is the base, and the second is the exponent to which it must be raised. It is performed using the ** operator:


              123456
            
console.log(10 ** 6); // 10 * 10 * 10 * 10 * 10 * 10 (6 times)
console.log(2 ** 7); // 2 * 2 * 2 * 2 * 2 * 2 * 2 (7 times)

let a = 2;
let b = 3;
console.log(a ** b);

Priority of Execution of Operations

Each operation has its execution priority, and the sequence of execution depends on it.

Note

If operations have the same priority, they will be executed from left to right.

You can use parentheses ( ) to modify the priority of execution:


              123
            
console.log(25 + 7 * 2 ** 3); // Example 1
console.log((25 + 7) * 2 ** 3); // Example 2
console.log(((25 + 7) * 2) ** 3); // Example 3

Note

Parentheses () have the highest priority. Inner parentheses are evaluated first, followed by outer ones.

1. What does the `%` operator return in JavaScript?

2. What will be the result of the following expression?

Everything was clear?

Thanks for your feedback!

Section 3. Chapter 2

Introduction to JavaScript

Mathematical Operations in JavaScript

Addition and Subtraction

Multiplication and Division

Remainder (Modulo)

Exponent

Priority of Execution of Operations

1. What does the % operator return in JavaScript?

2. What will be the result of the following expression?

Introduction to JavaScript

Mathematical Operations in JavaScript

Addition and Subtraction

Multiplication and Division

Remainder (Modulo)

Exponent

Priority of Execution of Operations

1. What does the % operator return in JavaScript?

2. What will be the result of the following expression?

1. What does the `%` operator return in JavaScript?

1. What does the `%` operator return in JavaScript?