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Range.fold

foldinitfunction

Documentation​

Combines all the elements of the range, by iteratively applying the passed function with next elements of the range.

In general, the result of Range start end step . fold init f is the same as f (...(f (f init start) start+step)...) last

Arguments​

  • init: The initial value for the fold.
  • function: A binary function taking an item and a number, and returning an item.

Examples​

In the following example, we'll compute the sum of all even integers​

less than 100.

      0.up_to 100 . with_step 2 . fold 0 (+)