Efficient use of test or assert

New to Julia
4

For a package-free alternative, throw(DomainError(...)) also seems to be recommended in this other thread.

Example:

dB(x) = (x > 0) ? 20*log10(x) : throw(DomainError(x, "argument <= 0"))
dB(0.5)     # -6.0
dB(-0.5)    # ERROR: DomainError with -0.5: argument <= 0