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24 lines
538 B
24 lines
538 B
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title = "Tricky questions for any rust interview" |
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draft = true |
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date = "2022-08-18" |
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[taxonomies] |
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tags = ["rust"] |
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+++ |
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Which type has variable `result`? |
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```rust |
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fn count_uppercase(s: &str) -> usize { |
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let result = { |
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let upper = s.chars().filter(|c| c.is_uppercase()).collect::<String>(); |
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return upper.len(); |
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}; |
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} |
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``` |
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<details><summary>Answer</summary> |
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`result` has '!' type or 'never type'. . [Read more](https://doc.rust-lang.org/book/ch19-04-advanced-types.html#the-never-type-that-never-returns) |
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</details> |