Conteúdo do Curso

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

Using the do while Loop for Iteration

Let's consider the do-while loop. This loop is similar to the while loop but has a key distinction.

while	do-while
Executes code block after the condition check.	Executes code block before the condition check.

Syntax

The do-while loop begins with the do keyword, encloses the code block within curly braces {}, and concludes with the while keyword followed by the condition in parentheses () without the need for an additional code block:

do {
  // code block
} while (condition);

Here's an example:


              123456
            
let a = 0;

do {
  console.log(a);
  a++;
} while (a <= 3 && a >= 1);

At the outset, the variable a was initialized to 0, and the condition a >= 1 was evaluated after the a++ operation.

The code block within the do is guaranteed to be executed at least once:


              123456789
            
// `while` loop
while (false) {
  console.log("while"); // Not executed
}

// `do-while` loop
do {
  console.log("do-while"); // Executed 1 time
} while (false);

The do-while loop is particularly useful when you need to prompt the user for input at least once and continue until the user enters valid data or meets a specific condition.

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