Name
list::reduce — Reduces a list to a single value.
Synopsis
flex1
list::reduce
( |
flex1
x
, |
| |
flex2
y
, |
| |
flex1
value
, |
| |
list<flex2>
list
, |
| |
block<flex1>
expression
); |
Parameters
-
flex1
x
-
flex2
y
-
flex1
value
-
list<flex2>
list
-
block<flex1>
expression
Description
Apply expression cumulatively to the values of the list, from left to right, to reduce the list to a single value. See http://en.wikipedia.org/wiki/Reduce_(higher-order_function) for a detailed explanation.
In this version the initial value is explicitly provided. Thus the list can be empty. Also the return type can be different from the type of the list.
Usage
list::reduce (integer x, integer y, 0, [2, 4, 6], { return x + y; }) -> 12
list::reduce (integer x, integer y, 1, [2, 4, 6], { return x * y; }) -> 48
list::reduce (term t, float f, `item(`id(`dummy)), [3.14, 2.71], { return add(t, tostring(f)); }) -> `item (`id (`dummy), "3.14", "2.71")
