Text with variables

Exercises in this lesson

You do them in the app, which checks them on the spot and explains why.

1. 1. Predict the output

   What does this code print?

   const age = 17;
   console.log(`Age: ${age}`);

2. 2. Complete the code

   Fill in so it prints I like pizza.

   const food = "pizza";
   console.log(`I like ${___}`);

3. 3. Find the bug

   This program should greet Jack by his name. Which line has the error?

   const name = "Jack";
   console.log("Hello, ${name}");

4. 4. Predict the output

   What does this code print?

   const a = 3;
   const b = 4;
   console.log(`${a} + ${b} = ${a + b}`);

5. 5. Multiple choice

   What type is what prompt() gives back?

6. 6. Predict the output

   If the person types 5, what does it print?

   const number = prompt();
   console.log(number + 1);

7. 7. Complete the code

   The person types 4. Fill in so it prints 7.

   const number = ___(prompt());
   console.log(number + 3);

8. 8. Put the lines in order

   The person types Jack. Order the lines to greet them by name.

9. 9. Find the bug

   The person types 3 and then 4. The program should print their sum. Which line has the error?

   const a = Number(prompt());
   const b = prompt();
   console.log(`Total: ${a + b}`);

10. 10. Predict the output

    The person types 35 (the price) and then 50 (what they pay). What does it print?

    const price = Number(prompt());
    const paid = Number(prompt());
    const change = paid - price;
    console.log(`Change: ${change}`);