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

Comparison Operators in JavaScript

Comparisons are used to define conditions, perform checks, and make decisions in JavaScript. These operations return a boolean value (true or false), which other operators use to determine certain actions.

Comparison Operators

JavaScript offers several comparison operators for comparing values:

Equal to (==);
Strict Equal To (===);
Not Equal To (!=);
Strict Not Equal To (!==);
Greater Than (>);
Greater Than or Equal To (>=);
Less Than (<);
Less Than or Equal To (<=).

Equal and Not Equal

The Equal To operation (==) returns true if the first value equals the second value and false otherwise.

Conversely, the Not Equal To operation (!=) returns true if the values are unequal.

Example:


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console.log("Equal to:");
console.log("5 == 5 is", 5 == 5);
console.log("5 == 4 is", 5 == 4);
console.log("5 == 4.99 is", 5 == 4.99);
            
console.log("Not equal to:");
console.log("5 != 5 is", 5 != 5);
console.log("5 != 4 is", 5 != 4);
console.log("5 != 4.99 is", 5 != 4.99);

Note

The = operator is for assignment, while == is for comparison. Be careful to distinguish them.

Strict comparison

Strict comparison checks the types of values and values. The Strict Equal To (===) operator returns true - if both the values and their types are the same, while !== returns true if they are different.

Example:


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console.log("5 === 5 is", 5 === 5);
console.log("5 === '5' is", 5 === '5');
console.log("5 == '5' is", 5 == '5');

console.log("5 !== 5 is", 5 !== 5);
console.log("5 !== '5' is", 5 !== '5');
console.log("5 != '5' is", 5 != '5');

console.log("Type of 5 is", typeof(5));
console.log("Type of '5' is", typeof('5'));

Greater and Less

The Greater Than (>) operator returns true if the first value exceeds the second. Conversely, the Less Than (<) operator returns true if the first value is less than the second.

Example:


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console.log("5 > 5 is", 5 > 5);
console.log("5 > 4.99 is", 5 > 4.99);
console.log("5 > 5.0000001 is", 5 > 5.0000001);

console.log("5 < 5 is", 5 < 5);
console.log("5 < 4.99 is", 5 < 4.99);
console.log("5 < 5.0000001 is", 5 < 5.0000001);

Greater/Less Than or Equal to

The Greater Than or Equal To (>=) and Less Than or Equal To (<=) operators combine the corresponding comparison operators with Equal To (==). They return true if either of the conditions is satisfied.


              1234567
            
console.log("5 >= 5 is", 5 >= 5);
console.log("5 >= 4.99 is", 5 >= 4.99);
console.log("5 >= 5.0000001 is", 5 >= 5.0000001);

console.log("5 <= 5 is", 5 <= 5);
console.log("5 <= 4.99 is", 5 <= 4.99);
console.log("5 <= 5.0000001 is", 5 <= 5.0000001);

Note

The >= operator combines > and ==, not ===. The <= operator works similarly.

1. What will be the output?

2. What will be the output?

3. What will be the output?

4. What will be the output?

Everything was clear?

Thanks for your feedback!

Section 3. Chapter 6

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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

Comparison Operators in JavaScript

Comparison Operators

JavaScript offers several comparison operators for comparing values:

Equal to (==);
Strict Equal To (===);
Not Equal To (!=);
Strict Not Equal To (!==);
Greater Than (>);
Greater Than or Equal To (>=);
Less Than (<);
Less Than or Equal To (<=).

Equal and Not Equal

The Equal To operation (==) returns true if the first value equals the second value and false otherwise.

Conversely, the Not Equal To operation (!=) returns true if the values are unequal.

Example:


              123456789
            
console.log("Equal to:");
console.log("5 == 5 is", 5 == 5);
console.log("5 == 4 is", 5 == 4);
console.log("5 == 4.99 is", 5 == 4.99);
            
console.log("Not equal to:");
console.log("5 != 5 is", 5 != 5);
console.log("5 != 4 is", 5 != 4);
console.log("5 != 4.99 is", 5 != 4.99);

Note

The = operator is for assignment, while == is for comparison. Be careful to distinguish them.

Strict comparison

Example:


              12345678910
            
console.log("5 === 5 is", 5 === 5);
console.log("5 === '5' is", 5 === '5');
console.log("5 == '5' is", 5 == '5');

console.log("5 !== 5 is", 5 !== 5);
console.log("5 !== '5' is", 5 !== '5');
console.log("5 != '5' is", 5 != '5');

console.log("Type of 5 is", typeof(5));
console.log("Type of '5' is", typeof('5'));

Greater and Less

The Greater Than (>) operator returns true if the first value exceeds the second. Conversely, the Less Than (<) operator returns true if the first value is less than the second.

Example:


              1234567
            
console.log("5 > 5 is", 5 > 5);
console.log("5 > 4.99 is", 5 > 4.99);
console.log("5 > 5.0000001 is", 5 > 5.0000001);

console.log("5 < 5 is", 5 < 5);
console.log("5 < 4.99 is", 5 < 4.99);
console.log("5 < 5.0000001 is", 5 < 5.0000001);

Greater/Less Than or Equal to


              1234567
            
console.log("5 >= 5 is", 5 >= 5);
console.log("5 >= 4.99 is", 5 >= 4.99);
console.log("5 >= 5.0000001 is", 5 >= 5.0000001);

console.log("5 <= 5 is", 5 <= 5);
console.log("5 <= 4.99 is", 5 <= 4.99);
console.log("5 <= 5.0000001 is", 5 <= 5.0000001);

Note

The >= operator combines > and ==, not ===. The <= operator works similarly.

1. What will be the output?

2. What will be the output?

3. What will be the output?

4. What will be the output?

Everything was clear?

Thanks for your feedback!

Section 3. Chapter 6