Kind/book/String.join.go.kind2
2024-03-01 20:40:31 -03:00

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String.join.go
: ∀(sep: String) ∀(strs: (List String)) String
= λsep λstrs
let P = λx String
let cons = λh λt
(String.concat
sep
(String.concat h (String.join.go sep t))
)
let nil = String.nil
(~strs P cons nil)