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Conditional Statements and Loops in JavaScript

bookAvoiding Infinite Loops

When you write code that repeats actions, you want it to eventually stop. An infinite loop is like getting stuck in a revolving door: you keep going around and around, but never find the exit. In programming, this happens when a loop never meets its stopping condition, causing your program to run forever or until it crashes. Understanding why infinite loops happen is important for writing safe and reliable code.

// Example of an infinite loop:
let counter = 1;
while (counter < 5) {
  // This line is missing: counter++;
  console.log("Counter is: " + counter);
}
// This loop will never end because 'counter' is never updated.


              
123456

            
// Fixed version:
let safeCounter = 1;
while (safeCounter < 5) {
  console.log("Counter is: " + safeCounter);
  safeCounter++; // Now the counter changes, and the loop will stop at 5
}
copy

1. Which change will prevent the following loop from running forever?

2. Fill in the blank to ensure this loop stops after printing numbers 1 to 4.

question mark

Which change will prevent the following loop from running forever?

Select the correct answer

question-icon

Fill in the blank to ensure this loop stops after printing numbers 1 to 4.

let num = 1; while (num < 5) { console.log(num); }
1
2
3
4

Click or drag`n`drop items and fill in the blanks

Tout était clair ?

Comment pouvons-nous l'améliorer ?

Merci pour vos commentaires !

Section 3. Chapitre 3

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bookAvoiding Infinite Loops

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When you write code that repeats actions, you want it to eventually stop. An infinite loop is like getting stuck in a revolving door: you keep going around and around, but never find the exit. In programming, this happens when a loop never meets its stopping condition, causing your program to run forever or until it crashes. Understanding why infinite loops happen is important for writing safe and reliable code.

// Example of an infinite loop:
let counter = 1;
while (counter < 5) {
  // This line is missing: counter++;
  console.log("Counter is: " + counter);
}
// This loop will never end because 'counter' is never updated.


              
123456

            
// Fixed version:
let safeCounter = 1;
while (safeCounter < 5) {
  console.log("Counter is: " + safeCounter);
  safeCounter++; // Now the counter changes, and the loop will stop at 5
}
copy

1. Which change will prevent the following loop from running forever?

2. Fill in the blank to ensure this loop stops after printing numbers 1 to 4.

question mark

Which change will prevent the following loop from running forever?

Select the correct answer

question-icon

Fill in the blank to ensure this loop stops after printing numbers 1 to 4.

let num = 1; while (num < 5) { console.log(num); }
1
2
3
4

Click or drag`n`drop items and fill in the blanks

Tout était clair ?

Comment pouvons-nous l'améliorer ?

Merci pour vos commentaires !

Section 3. Chapitre 3
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