JavaScript Brain Teasers: Exercise Your Mind/

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Your Code Deserves a Lift

Your Code Deserves a Lift

Test your JavaScript programming skills by solving the given puzzle about variable scoping and hoisting.

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Puzzle code

Carefully read the code given below:

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let temp = 25;
function displayTemperature() {
  console.log(`Current temperature: ${temp} °C`);
}
function forecastTemperature() {
  console.log(`Expected temperature: ${temp} °C`);
  var temp = 28;
}
displayTemperature();
forecastTemperature();

Your task: Guess the output

Try to guess the output of the above code. Attempt the following quiz to assess your understanding.

Q

What is the output of the code above?

A)
Current temperature: 25 °C
Expected temperature: 25 °C
B)
Current temperature: 25 °C
Expected temperature: undefined °C
C)
Current temperature: 25 °C
Expected temperature: 28 °C
D)
Current temperature: 28 °C
Expected temperature: 28 °C

Let’s discuss this code and output together in the next lesson.