RosettaCodeData/Task/Catamorphism/M2000-Interpreter/catamorphism.m2000

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Module CheckIt {
Function Reduce (a, f) {
if len(a)=0 then Error "Nothing to reduce"
if len(a)=1 then =Array(a) : Exit
k=each(a, 2, -1)
m=Array(a)
While k {
m=f(m, array(k))
}
=m
}
a=(1, 2, 3, 4, 5)
Print "Array", a
Print "Sum", Reduce(a, lambda (x,y)->x+y)
Print "Difference", Reduce(a, lambda (x,y)->x-y)
Print "Product", Reduce(a, lambda (x,y)->x*y)
Print "Minimum", Reduce(a, lambda (x,y)->if(x<y->x, y))
Print "Maximum", Reduce(a, lambda (x,y)->if(x>y->x, y))
}
CheckIt