1> ["1", "two", "10"].compactMap { Int($0) } //=> [1, 10]
2> ["1", "two", "10"].compactMap(Int.init) //=> [1, 10]
3> ["1", "two", "10"].map { $0[...] }.compactMap { Int($0) } //=> [1, 10]
4> ["1", "two", "10"].map { $0[...] }.compactMap(Int.init) //=> [0, 0, 0]
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