Array.foldl()
Jump to navigation
Jump to search
Array.foldl(SomFunction, SomeStartValue)
At each element, SomeFunction (that can take two parameter values) are called in sequence for element from the left. The second parameter is the last value of evaluation of the given SomeFunction. For the very first element, the SomeStartValue is passed as the second parameter, if present. If no SomeStartValue is provided, it starts with the first two as the pair to start with.
a=1..5;
a.foldl(
function (last,x)
{
OUTPUT([last,x,(last-x)]);
return(last-x)
},
0
)
0 1 -1
-1 2 -3
-3 3 -6
-6 4 -10
-10 5 -15
-15
a=1..5;
a.foldl(
function (last,x)
{
OUTPUT([last,x,(last-x)]);
return(last-x)
}
)
1 2 -1
-1 3 -4
-4 4 -8
-8 5 -13
-13
a=1..3;
a.foldr(MINUS,2)
-4 (2-1-2-3)