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35 lines
849 B
Python
35 lines
849 B
Python
# Record is a feature similar to object (literal notation) in JS
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# `.` means the field is public
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john = {
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.name = "John Smith"
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.age = !27
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}
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print! john.name
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print! john.age
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assert john.name == "John Smith"
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assert john.age == 27
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# john.age.update! old -> old + 1
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# assert john.age == 28
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# Record is not Dict, so `john["name"]` is invalid
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# A record whose values are all types will also behave as a type
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Person! = {
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.name = Str
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.age = Nat!
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}
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print! Person!.name
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assert Person!.name == Str
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# assert john in Person!
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for! {.x = 1; .y = 2}.as_dict().items(), ((k, v),) =>
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# k: Str, v: Int
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print! k, v
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# {=} means the empty record (type), which is the subtype of all records
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iterate_rec! r: {=} =
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for! r.as_dict().items(), ((k, v),) =>
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print! k, v
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iterate_rec! {a = 1; b = 2}
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iterate_rec! {a = 1; b = 1.2; c = "a"}
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