Char in Rust

Things on this page are fragmentary and immature notes/thoughts of the author. Please read with your own judgement!

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Character¶

Rust supports unicode characters. Notice that emojis are single unicode characters.

let c1 = 'a';
c1

'a'

let c2 = '\u{1f604}';
c2

'😄'

'Z' as u32

90

char::from_u32(90)

Some('Z')

let c = char::from_u32(0x2764);
c

Some('❤')

char::from_digit(9, 10)

Some('9')

char::to_uppercase returns an interator instead of a char!

'a'.to_uppercase()

ToUppercase(One('A'))

'a'.to_uppercase().next()

Some('A')

'a'.to_uppercase().next().unwrap()

'A'