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.

Technical Quiz
1.

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