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Conditional Statements and Loops in JavaScript

bookwhile and do...while Loops

Imagine you are playing a game where you roll a standard six-sided die over and over, hoping to get a six. You keep rolling until you finally see that six appear. You do not know how many times you will have to roll—it might be the first try, or it might take several attempts. This is a lot like how a while loop works in JavaScript: it keeps repeating a block of code as long as a certain condition is true. When the condition changes (you roll a six), the loop stops.


              
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// Simulate rolling a die until a six appears using a while loop
let roll = 0;
while (roll !== 6) {
  roll = Math.floor(Math.random() * 6) + 1;
  console.log("You rolled a " + roll);
}
console.log("You finally rolled a six!");
copy

              
1234567

            
// Simulate rolling a die until a six appears using a do...while loop
let roll = 0;
do {
  roll = Math.floor(Math.random() * 6) + 1;
  console.log("You rolled a " + roll);
} while (roll !== 6);
console.log("You finally rolled a six!");
copy

1. Which type of loop will always run its code at least once, even if the condition is false to begin with?

2. Fill in the blank to complete the while loop so it stops when count reaches 5.

question mark

Which type of loop will always run its code at least once, even if the condition is false to begin with?

Select the correct answer

question-icon

Fill in the blank to complete the while loop so it stops when count reaches 5.

let count = 0; while () { console.log(count); count++; }
0
1
2
3
4

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

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Sektion 2. Kapitel 4

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bookwhile and do...while Loops

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Imagine you are playing a game where you roll a standard six-sided die over and over, hoping to get a six. You keep rolling until you finally see that six appear. You do not know how many times you will have to roll—it might be the first try, or it might take several attempts. This is a lot like how a while loop works in JavaScript: it keeps repeating a block of code as long as a certain condition is true. When the condition changes (you roll a six), the loop stops.


              
1234567

            
// Simulate rolling a die until a six appears using a while loop
let roll = 0;
while (roll !== 6) {
  roll = Math.floor(Math.random() * 6) + 1;
  console.log("You rolled a " + roll);
}
console.log("You finally rolled a six!");
copy

              
1234567

            
// Simulate rolling a die until a six appears using a do...while loop
let roll = 0;
do {
  roll = Math.floor(Math.random() * 6) + 1;
  console.log("You rolled a " + roll);
} while (roll !== 6);
console.log("You finally rolled a six!");
copy

1. Which type of loop will always run its code at least once, even if the condition is false to begin with?

2. Fill in the blank to complete the while loop so it stops when count reaches 5.

question mark

Which type of loop will always run its code at least once, even if the condition is false to begin with?

Select the correct answer

question-icon

Fill in the blank to complete the while loop so it stops when count reaches 5.

let count = 0; while () { console.log(count); count++; }
0
1
2
3
4

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

Var alt klart?

Hvordan kan vi forbedre det?

Tak for dine kommentarer!

Sektion 2. Kapitel 4
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