Apply code to items in collection

apply collection code

Recalculates values of items in collection using code. Code is a list of instructions, where the value of the last instruction is used as the new value of an item. Code is executed as a function: all local variables and functions will be destroyed on exit from the code block. Variables :index and :vaue are available in the code block, with values corresponding to the index and the current value of an item in the collection.


"a := range 1 5
print :a
apply :a [
  let "x :value
  if :index > 1 ["x += :a,(:index - 1)]
  :x ;sum of item values, including current item
print :a


{1 2 3 4 5}
{1 3 6 10 15}

See also:

array - create an array from values
newarray - create an array of a given size
genarray - create an array using code


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