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JavaScript Brain Teasers: Exercise Your Mind

Your Code Deserves a Lift

Explore a complex JavaScript puzzle that challenges you to predict the code output. This lesson helps improve your understanding of JavaScript behavior and sharpens your problem-solving skills through active engagement with code.

We'll cover the following...

Puzzle code

Carefully read the code given below:

Javascript (babel-node)
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
1 / 1

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