Checkpoint: Logic and Functions

Five questions on this section. Answer all of them, then see your score and why each answer is right or wrong.

What does this log?

JavaScript

function sizeLabel(amount) {
  if (amount > 100) return "big";
  if (amount > 1000) return "huge";
  return "small";
}
console.log(sizeLabel(5000));

huge
small
big
undefined

A function shows “No note” when if (note) is false. Which of these notes is treated as missing?

"0"
" " (a single space)
"false"
"" (an empty string)

What does this log?

JavaScript

let count = 0;
for (let i = 0; i < 5; i++) {
  if (i === 3) break;
  count++;
}
console.log(count);

What does this log?

JavaScript

const add = (a, b = 10) => a + b;
console.log(add(5), add(5, 0), add(5, null));

15 15 15
15 5 5
15 5 15
15 15 5

What does this log?

JavaScript

function makeLimiter(max) {
  let used = 0;
  return () => {
    if (used >= max) return false;
    used++;
    return true;
  };
}
const canAdd = makeLimiter(2);
console.log(canAdd(), canAdd(), canAdd());

true true true
false false false
true true false
true false false

5 questions unanswered