Thread

1. _moof · 1789625340 · focus · HN ↗

   What's hard to understand about it? It's just

     x = initial
     for y in collection:
       x = f(y, x)

   1. ema · 1789628755 · focus · HN ↗

      It's easy but it ain't simple. Because `f` can do arbitrary things to `x` you have to look at it just to know the general shape of the computation. Reduce gives you a lot of the flexibility of imperative programming but with that also a lot of the problems. Sometimes that's the right trade-off but it is good to be aware that it is a trade-off.
   2. Joker_vD · 1789652747 · focus · HN ↗

      You mean "f(x, y)", right? Half of the languages that have reduce/fold use this ordering, another half uses yours.

      So in effect, as some other commenter said, it's just the loop with worse syntax.

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