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struct Foo(x,y:Int)
func main():
>> (+: [10, 20, 30])
= 60?
>> (+: [:Int])
= none : Int
>> (+: [10, 20, 30]) or 0
= 60
>> (+: [:Int]) or 0
= 0
>> (_max_: [3, 5, 2, 1, 4])
= 5?
>> (_max_:abs(): [1, -10, 5])
= -10?
>> (_max_: [Foo(0, 0), Foo(1, 0), Foo(0, 10)])!
= Foo(x=1, y=0)
>> (_max_.y: [Foo(0, 0), Foo(1, 0), Foo(0, 10)])!
= Foo(x=0, y=10)
>> (_max_.y:abs(): [Foo(0, 0), Foo(1, 0), Foo(0, 10), Foo(0, -999)])!
= Foo(x=0, y=-999)
!! (or) and (and) have early out behavior:
>> (or: i == 3 for i in 9999999999999999999999999999)!
= yes
>> (and: i < 10 for i in 9999999999999999999999999999)!
= no
>> (<=: [1, 2, 2, 3, 4])!
= yes
>> (<=: [:Int])
= none : Bool
>> (<=: [5, 4, 3, 2, 1])!
= no
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