Question

I’m porting Amp’s DiffLib implementation to C# and stumbled upon this very line (#114):

@b2j[@a[i,1]] && @b2j[@a[i,1]].each do |j|

Now, I got everything else ported and most tests seem to pass but I still do not understand what is this && here for. I assume it is something along those lines in C#:

if(b2j.ContainsKey(a[i]))
{
    foreach(var j in b2j[a[i]])

But still not particularly sure about that.

Answer 1

It says that if @b2j[@a[i,1]] is not nil and not false, then continue and do an iteration with each it. It is used to control the flow of the program in this case.