Split a list in half

Question

I need to define divide so that List [1,2,3,4,5] divides into:

a = [1,2,3}

b = [4,5]

I\'m getting an error that says \"

Answer 1

Surely the effect of this code (lengthIs(L2, M) < lengthIs(L1,N)/2 -> ...) isn't what you expect: it doesn't compare numbers, but terms. You should write it this way:

lengthIs(L2, M), lengthIs(L1, N), M < N/2 -> ...

Another typo like mistake: the first clause of lengthIs/2 should read

lengthIs([],0).