In Haskell String is an alias for [Char]:
type String = [Char]
If you just want a function that converts a single char to a string you could e.g. do
charToString :: Char -> String
charToString c = [c]
If you prefer pointfree style you could also write
charToString :: Char -> String
charToString = (:[])
Top answer 1 of 4
65
In Haskell String is an alias for [Char]:
type String = [Char]
If you just want a function that converts a single char to a string you could e.g. do
charToString :: Char -> String
charToString c = [c]
If you prefer pointfree style you could also write
charToString :: Char -> String
charToString = (:[])
2 of 4
5
A String is just a [Char]
But that's just a nice way of saying
'H':'E':'L':'L':'O':[]
So to make it a [String] we could do:
['H':'E':'L':'L':'O':[]]
Hackage
hackage.haskell.org › package › base-4.3.1.0 › docs › Data-Char.html
Data.Char - Hackage - Haskell.org
Convert a character to a string using only printable characters, using Haskell source-language escape conventions.
TutorialsPoint
tutorialspoint.com › haskell-program-to-convert-character-to-string
Haskell Program to Convert Character to String
March 28, 2023 - In Haskell, we can convert Character to String by using user-defined function, show function, list comprehension and (:[]) notation. In the first example, we are going to use (charToString c = [c]) function and in the second example, we are going to use (charToString c = show c) function.
Reddit
reddit.com › r/haskell › how to concatenate a character to a string
How to concatenate a character to a string : r/haskell
January 30, 2023 - Share ... Remember String is just a type alias for [Char]. You cant concatenate a Char to a [Char]. But you can concatenate a List with a single Char with another list of Char ( [head s1] ++ s2 ), or even prepend the single Char to a list of Char ( head s1 : s2 )
Reddit
reddit.com › r/haskell › get first char of a string
r/haskell on Reddit: get first char of a String
October 18, 2012 -
Hey there Im new with Haskell, for a function i need to get the first char out of a String, any Idea how i could do this?
Top answer 1 of 5
13
Instead of having a fervent safety debate (already thoroughly covered)... this might help you. Prelude> take 1 "hello" "h" Prelude> take 1 "" "" Prelude> head "hello" 'h' Prelude> head "" *** Exception: Prelude.head: empty list
2 of 5
7
Important to note: head is unsafe if the string might not have a first character. Control.Error exports a safe version :)
Hasufell
hasufell.github.io › posts › 2024-05-07-ultimate-string-guide.html
The ultimate guide to Haskell Strings · Hasufell's blog
May 7, 2024 - I hope this blog post can fill some of the documentation gaps and also explain the newly introduced types and why I think that we don’t have too many String types. The most widely used String type in Haskell is defined by the Haskell Standard in Chapter 9 Standard Prelude: -- Lists data [a] = [] | a : [a] -- Not legal Haskell; for illustration only -- Character type data Char = ...
Hackage
hackage.haskell.org › package › haskell98 › docs › Char.html
Char - Hackage - Haskell
Convert a character to a string using only printable characters, using Haskell source-language escape conventions.
Top answer 1 of 3
18
In Haskell, strings are just (linked) lists of characters; you can find the line
type String = [Char]
somewhere in the source of every Haskell implementation. That makes tasks such as finding the first occurence of a certain character (elemIndex 'a' mystring) or calculating the frequency of each character (map (head &&& length) . group . sort) trivial.
Because of this, you can use the usual syntax for lists with strings, too. Actually, "foo" is just sugar for ['f','o','o'], which in turn is just sugar for 'f' : 'o' : 'o' : []. You can pattern match, map and fold on them as you like. For instance, if you want to get the element at position n of mystring, you could use mystring !! n, provided that 0 <= n < length mystring.
2 of 3
15
Well, the question does say he wants an array:
import Data.Array
stringToArray :: String -> Array
stringToArray s = listArray (0, length s - 1) s
Haskell
haskell.org › hugs › pages › libraries › base › Data-Char.html
Data.Char
The character type Char is an enumeration whose values represent Unicode (or equivalently ISO/IEC 10646) characters (see http://www.unicode.org/ for details). This set extends the ISO 8859-1 (Latin-1) character set (the first 256 charachers), which is itself an extension of the ASCII character ...
Elte
lambda.inf.elte.hu › haskell › doc › libraries › base-4.11.1.0 › Data-Char.html
Data.Char
Convert a character to a string using only printable characters, using Haskell source-language escape conventions.
Uni-freiburg
www2.informatik.uni-freiburg.de › ~thiemann › haskell › haskell98-library-html › char.html
The Haskell 98 Library Report: Character Utilities
The function showLitChar converts a character to a string using only printable characters, using Haskell source-language escape conventions. The function lexLitChar does the reverse, returning the sequence of characters that encode the character. The function readLitChar does the same, but ...
Haskell
downloads.haskell.org › ~ghc › 6.4.2 › docs › html › libraries › base › Data-Char.html
Data.Char
The character type Char is an enumeration whose values represent Unicode (or equivalently ISO 10646) characters. This set extends the ISO 8859-1 (Latin-1) character set (the first 256 charachers), which is itself an extension of the ASCII character set (the first 128 characters).
Dal University
web.cs.dal.ca › ~nzeh › Teaching › 3137 › haskell › first_steps › basic_types › strings
Characters and Strings - CSCI 3137: Haskell Programming
The type of a list that contains elements of type a is [a]. So, the String type in Haskell is literally defined as a type alias for [Char]: ... We'll learn about the type keyword to define type aliases later.
Hackage
hackage.haskell.org › package › base › docs › Data-Char.html
Data.Char - Hackage - Haskell
Convert a character to a string using only printable characters, using Haskell source-language escape conventions.
ZVON
zvon.org › other › haskell › Outputprelude › String_d.html
Haskell : String
Enjoy! ZVON team Any suggestions send to webmaster@zvon.org, please
Lotz84
lotz84.github.io › haskellbyexample › ex › string-functions
Haskell by Example: String Functions
import Data.List import Data.Char include :: String -> String -> Bool include xs ys = or . map (isPrefixOf ys) . tails $ xs joinWith :: [String] -> String -> String joinWith xs sep = concat . init . concat $ [[x, sep] | x <- xs] split :: String -> Char -> [String] split "" _ = [] split xs c = let (ys, zs) = break (== c) xs in if null zs then [ys] else ys : split (tail zs) c main = do putStrLn $ "Contains: " ++ show ("test" `include` "es") putStrLn $ "Count: " ++ show (length . filter (=='t') $ "test") putStrLn $ "HasPrefix: " ++ show (isPrefixOf "te" "test") putStrLn $ "HasSuffix: " ++ show (i
Real World Haskell
book.realworldhaskell.org › read › characters-strings-and-escaping-rules.html
Appendix B. Characters, strings, and escaping rules
Haskell allows Unicode characters to be written using numeric escapes. A decimal character begins with a digit, e.g. \1234. A hexadecimal character begins with an x, e.g. \xbeef. An octal character begins with an o, e.g. \o1234. The maximum value of a numeric literal is \1114111, which may also be written \x10ffff or \o4177777. String literals can contain a zero-width escape sequence, written \&. This is not a real character, as it represents the empty string.
Monday Morning Haskell
mmhaskell.com › blog › 2017 › 5 › 15 › untangling-haskells-strings
Untangling Haskell's Strings — Monday Morning Haskell
December 9, 2023 - So whenever you see [Char] in your compile errors, know this refers to the basic String type. By default, when you enter in a string literal in your Haskell code, the compiler infers it as a String.
Hackage
hackage.haskell.org › package › text-0.3 › docs › Data-Text.html
Data.Text - Hackage - Haskell
O(n) Convert a Text into a String. Subject to array fusion. ... O(1) Convert a character into a Text.