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struct Pair(x:Text, y:Text)
func pairwise(strs:[Text] -> func(->Pair?)):
i := 1
return func():
if i + 1 > strs.length: return none:Pair
i += 1
return Pair(strs[i-1], strs[i])?
func range(first:Int, last:Int -> func(->Int?)):
i := first
return func():
if i > last:
return none:Int
i += 1
return (i-1)?
func main():
values := ["A", "B", "C", "D"]
>> (++: "($(foo.x)$(foo.y))" for foo in pairwise(values))!
= "(AB)(BC)(CD)"
>> ["$(foo.x)$(foo.y)" for foo in pairwise(values)]
= ["AB", "BC", "CD"]
do:
result : @[Text] = @[]
for foo in pairwise(values):
result:insert("$(foo.x)$(foo.y)")
>> result[]
= ["AB", "BC", "CD"]
>> [i for i in range(5, 10)]
= [5, 6, 7, 8, 9, 10]
>> (+: range(5, 10))!
= 45
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