The above example is at least academically interesting since you can reason through it with a bit of programming experience and intuition about operator precedence.

    Does plus or pre/postfix increment have higher precedence?
    Probably increment.
    Does prefix or postfix have higher precedence?
    They're probably the same -> evaluate from left-to-right.
    Code is equivalent to num1++ + num2;

But the examples like "what is the difference between substring() and substr()", "What is the lowest cross-browser increment that [setInterval()/setTimeout()] can accurately use" is just trivia and is boring.