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11 lines
309 B
11 lines
309 B
3 years ago
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fn main() {
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let phrase = std::env::args().skip(1).collect::<Vec<String>>().join(" ");
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let mapper = [
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Box::new(|x: char| x.to_uppercase()),
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Box::new(|x: char| x.to_lowercase()),
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]
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.iter()
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.cycle();
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println!("{}", phrase.chars().map(mapper.next()).collect().join(""));
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}
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