Function Quiz
Predict a function result before running it. Distinguish a default parameter from an argument supplied explicitly.
Where to run this
This example uses the JavaScript console playground. Select Run to execute it; the example does not run on this lesson page.
Before you run it
Write down the result you expect and explain which line produces it. Then run the example and compare your reasoning with the result below.
A practical example
function fee(amount = 5) {
return amount * 2;
}
console.log(fee(), fee(0));
What happens
The answers are 10 and 0. Explain why zero does not use the default.