modeling-app/docs/kcl/reduce.md

title, excerpt, layout

title	excerpt	layout
reduce	Take a starting value. Then, for each element of an array, calculate the next value,	manual

Take a starting value. Then, for each element of an array, calculate the next value,

using the previous value and the element.

reduce(array: [KclValue], start: KclValue, reduce_fn: FunctionParam) -> KclValue

Arguments

Name	Type	Description	Required
array	[KclValue]		Yes
start	KclValue	A memory item.	Yes
reduce_fn	FunctionParam		Yes

Returns

KclValue - A memory item.

Examples

fn decagon = (radius) => {
  step = 1 / 10 * tau()
  sketch001 = startSketchAt([cos(0) * radius, sin(0) * radius])
  return reduce([1, 2, 3, 4, 5, 6, 7, 8, 9, 10], sketch001, (i, sg) => {
  x = cos(step * i) * radius
  y = sin(step * i) * radius
  return lineTo([x, y], sg)
})
}
decagon(5.0)
  |> close(%)

array = [1, 2, 3]
sum = reduce(array, 0, (i, result_so_far) => {
  return i + result_so_far
})
assertEqual(sum, 6, 0.00001, "1 + 2 + 3 summed is 6")

fn add = (a, b) => {
  return a + b
}
fn sum = (array) => {
  return reduce(array, 0, add)
}
assertEqual(sum([1, 2, 3]), 6, 0.00001, "1 + 2 + 3 summed is 6")