Question

How can I express the next for loops in a rubysh way?

for (r = 1; r < R; r++) {
    for (i = 0; i < 4; i++) {
            #do something
            }
}

I want to express the above code with an elegant ruby syntax.
Thanks in advance.

Answer 1

By default, the way I’d write that in Ruby is this:

for r in 1..(R-1) do
  for i in 0..3 do
    # Do something
  end
end

But an even better way is to take advantage of the Range feature pointed out by @PedroNascimento in his answer, using three dots rather than two in order to leave the last item out of the Range:

for r in 1...R do
  for i in 0...4 do
    # Do something
  end
end

That’s both nicer to look at and more clearly expresses the meaning of the code.