foldl
lib.lists.foldl
Docs pulled from | This Revision | 17 minutes ago
“left fold”, like foldr
, but from the left:
foldl op nul [x_1 x_2 ... x_n] == op (... (op (op nul x_1) x_2) ... x_n)
.
Inputs
op
-
1. Function argument
nul
-
2. Function argument
list
-
3. Function argument
Type
foldl :: (b -> a -> b) -> b -> [a] -> b
Examples
lib.lists.foldl
usage example
lconcat = foldl (a: b: a + b) "z"
lconcat [ "a" "b" "c" ]
=> "zabc"
# different types
lstrange = foldl (str: int: str + toString (int + 1)) "a"
lstrange [ 1 2 3 4 ]
=> "a2345"