Check the condition, especially at the boundary

A function can return true or false

Now inspect this function:

function isPassing(score) {
  return score > 60;
}

score > 60 is a comparison. It returns true when the score is greater than 60, otherwise false.

But the requirement says: numeric scores of 60 or higher pass.

So predict these results:

That means the function is wrong at the boundary value 60. It excludes 60, even though 60 should pass.

Correct the bug

The fix is one character:

function isPassing(score) {
  return score >= 60;
}

Now the worked results match the requirement:

• isPassing(59) → false
• isPassing(60) → true
• isPassing(61) → true

This is a classic code-reading move: compare the code to the requirement, then test the edge case where the wording changes.