Programming-Idioms

Edit summary for version 20 by Alfriadox:
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2017-12-06, 13:55:13

2017-12-06, 13:56:45

Idiom #137 Check if string contains only digits

Set boolean b to true if string s contains only characters in range '0'..'9', false otherwise.

Set boolean b to true if string s contains only characters in range '0'..'9', false otherwise.

let chars_are_numeric: Vec<bool> = s.chars()
				.map(|c|c.is_numeric())
				.collect();
let b = !chars_are_numeric.contains(&false);

let chars_are_numeric: Vec<bool> = s.chars()
				.map(|c|c.is_numeric())
				.collect();
let b = !chars_are_numeric.contains(&false);

Note that is_numeric is not just 0 -> 9.
See documentation for more info.

https://doc.rust-lang.org/std/primitive.char.html#method.is_numeric

https://play.rust-lang.org/?gist=9ca489c1de25feb2f09a1770e40b62b1&version=stable

https://play.rust-lang.org/?gist=9ca489c1de25feb2f09a1770e40b62b1&version=stable

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