GeezerVison is showing github.com — JavaScript-Fundamentals/021-do-while.js at main · luiz158/JavaScript-Fundamentals

Expand file tree

021-do-while.js

Copy path

More file actions

Latest commit

History

79 lines (56 loc) · 1.55 KB

021-do-while.js

Copy path

File metadata and controls

79 lines (56 loc) · 1.55 KB

Raw

Copy raw file

Download raw file

Open symbols panel

Edit and raw actions

// 1: WHAT IS A DO WHILE LOOP?

// do {

// // code to be executed

// } while (condition);

// 2: DO WHILE VS WHILE LOOP

// let count = 5;

// while (count < 3) {

// console.log("Count is: " + count);

// count++;

// }

// console.log("Loop finished");

let count = 5;

do {

console.log("Count is: " + count);

count++;

} while (count < 3);

console.log("Loop finished");

// 3: PRACTICAL EXAMPLES

// Example 1: User Input Validation

let userInput;

do {

userInput = prompt("Please enter a number between 1 and 10:");

userInput = Number(userInput);

} while (userInput < 1 || userInput > 10 || isNaN(userInput));

console.log("Thank you! You entered: " + userInput);

// Example 2: Menu Systems

let choice;

do {

console.log("=== Menu ===");

console.log("1. Start Game");

console.log("2. Settings");

console.log("3. Exit");

choice = prompt("Enter your choice (1-3):");

if (choice === "1") {

console.log("Starting game...");

} else if (choice === "2") {

console.log("Opening settings...");

}

} while (choice !== "3");

console.log("Thanks for playing!");

// 4: COMMON PATTERNS & BEST PRACTICES

// let i = 1;

// do {

// console.log("Iteration: " + i);

// i++;

// } while (i <= 5);

// BAD - Infinite loop!

// let x = 0;

// do {

// console.log(x);

// // Forgot to increment x!

// } while (x < 5);

do {

console.log("Hello");

} while (false); // Semicolon is required here!

// 5: WHEN TO USE DO WHILE