When type coercion should happens in Javascript comparisons?

Question

How should I know when a "truthy" or "falsy" will be coerced into true or false when using the "==" operator for comparisons? For example "null" or "undefined" are "falsies", but can't be coerced to false using "==", but an empty string or 0 can, is it because of the type of undefined (undefined) or null (object)?

NaN is number, a "falsy" and can't be coerced either (I know "NaN === NaN" is always false).

I'm curious even though I know we should (at least almost) never use "==" instead of "===", but sometimes this type of knowledge is required even for some challenge questions here on Sololearn.

Thanks in advance.

Answer 1

Here is full explanation

https://code.sololearn.com/W3CwqAGgJqRV/?ref=app