Char and String Types#


The Char type is written in single quotes. We can also use Unicode code points in hexadecimal to create a char. Note the \x... escape sequence.

charZ :: Char
charZ = 'Z'

check :: Char
check = '\x2714'
-- → ✔


The String type is written with double quotes.

Unlike in some other languages, line continuation requires not one escape, but two.

hello :: String
hello = "Hello, world!"

withNl :: String
withNl = "Contains a\nnewline."


multi :: String
multi = "This string\
        \ spawns over\
        \ multiple lines, but spaces\
        \ to the \
        \ left of the ‘\\’ are ignored.\
        \ Oh, and Unicode code points\
        \ work too \x2714! 💖"
> log multi
This string spawns over multiple lines, but spaces to the  left of the ‘\’ are ignored.
 Oh, and Unicode code points work too ✔! 💖

Spaces before the trailing \ concatenate with spaces after the leading \.


We can use \x escapes with hexadecimal numbers to denote a Unicode code point.


For Char, as of PureScript 0.15, it seems we can use up to 4 bytes:

> '\x2714'

> '\x2717'

> '\x03bb'

> '\x203d'

> '\x0001f4a9'
Unexpected a at line 1, column 10
> '\x1f4a9'
Illegal astral code point in character literal at line 1, column 9


For String, we can use up to 6 bytes (which as of 2022, is enough every Unicode code point without using surrogates, since as of this day, Unicode goes up to 10FFFF).

> "\x2714"

> "\x1f4a9"

> "\x01f4a9"

> "\x0001f4a9"

Surrogates work with String, but not with Char:

> "\xD83d\xDCA9"

> '\xD83d\xDCA9'
Unexpected \ at line 1, column 8

See this discussion on the PureScript Discord server about this topic and this issue on the PureScript repo.