what to choose between require and assert in scala

Question

Both require and assert are used to perform certain checks during runtime to verify certain conditions.

So what is the basic difference bet

Answer 1

In very simple language:

Require is used to enforce a precondition on the caller of a function or the creator of an object of some class. Whereas, assert is used to check the code of the function itself. So, if a precondition fails, then you get an illegal argument exception. Whereas, if an assertion fails and it's not the caller's fault and consequently you get an assertion error.