Poll: Do you know in JavaScript, what `a == null` is for, exactly?

Poll: what does a == null do exactly in JavaScript?

1. I know exactly what it does.
2. I have some ideas, but not exactly.
3. I don't know exactly what it does.
4. I don't know exactly what it does before today.

you can add what it does in the answer as well.

Comments

[Pacharapol Withayasakpunt]

No, I just can't predict about == in JavaScript, so number 3.

Also, and interestingly, is there a performance difference, or just convenience for type coercion?

[sunflowerseed]

good answer... I think the cases with == is just so highly unpredictable... and so many different cases