Module: list/reducing

Methods

(static) foldl(f, z, xs) → {*}

Left-associative fold of a structure (i.e. fold from the end to the beginning, rather than from the beginning to the end, as with foldr, the right-associative version). This function currently only works with List objects but should be generalized to work with all Foldable types, as in Haskell.
Haskell> foldl :: Foldable t => (b -> a -> b) -> b -> t a -> b

Parameters:
Name Type Description
f function

The function to map over the List
z *

An accumulator value
xs List

The List to fold
Source:
Returns:

The result of applying the function to the List and the accumulator

Type
*
Example
const lst = list(1,2,3);
const f = (x, y) => x - y;
foldl(f, 0, lst);          // => -6