33 lines
769 B
Rust
33 lines
769 B
Rust
const PHONE_MASK: &str = "(___) ___-____";
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const ZERO: u8 = '0' as u8;
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fn create_phone_number(numbers: &[u8]) -> String {
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let mut position = 0;
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PHONE_MASK
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.chars()
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.map(|c| match c {
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'_' => {
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let c = (numbers[position] + ZERO) as char;
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position += 1;
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c
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}
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c => c,
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})
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.collect()
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}
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#[test]
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fn returns_expected() {
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assert_eq!(
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create_phone_number(&[1, 2, 3, 4, 5, 6, 7, 8, 9, 0]),
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"(123) 456-7890"
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);
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assert_eq!(
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create_phone_number(&[1, 1, 1, 1, 1, 1, 1, 1, 1, 1]),
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"(111) 111-1111"
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);
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assert_eq!(
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create_phone_number(&[1, 2, 3, 4, 5, 6, 7, 8, 9, 9]),
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"(123) 456-7899"
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);
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}
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