Exactly, and sometimes you also get the indez as argument of the function. `reduce(acc,(acc,elem,idx)=>…)` and in many case the accumulator is a tuple, and in

Exactly, and sometimes you also get the indez as argument of the function. `reduce(acc,(acc,elem,idx)=>…)` and in many case the accumulator is a tuple, and in many cases you need to know the length of the collection ( like average) all in all, it’s a lot just to avoid a for loop.