RosettaCodeData/Task/Forward-difference/Lasso/forward-difference.lasso

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#!/usr/bin/lasso9
define forwardDiff(values, order::integer=1) => {
!#order ? return #values->asArray
local(result = array)
iterate(#values) => {
loop_count < #values->size ?
#result->insert(#values->get(loop_count+1) - #values->get(loop_count))
}
#order > 1 ? #result = forwardDiff(#result, #order-1)
return #result
}
local(data = (:90, 47, 58, 29, 22, 32, 55, 5, 55, 73))
with x in generateSeries(0, #data->size-1)
do stdoutnl(#x + ': ' + forwardDiff(#data, #x))