R recursion implementation is not an apples-to-apples comparison

[ViralBShah]

When I looked at the benchmarks, I was particularly surprised because I couldn't imagine the recursive fib being that fast compared to C.

The R recursion example is not an apples-to-apples comparison, because it is using two accumulators. In fact the commented out R code at https://github.com/JulesKouatchou/basic_language_comparison/blob/master/R/test_fibonacci.R#L15 is the right one. Or alternatively, all languages should use the one with two accumulators.

For example, here's the Julia version that does what the R version does and runs as fast.

 function Fib(N)
           function F(N, a, b)
               N == 0 && return b
               F(N-1, a+b, a)
           end
           F(N, 1, 0)
       end

Much of this was done by @syxpek on the Julia slack. I am just reporting it.