Haskell: Strings are lists internally

In Haskell String are implements as list of characters internally.

Prelude> let hello = ['h', 'e', 'l', 'l', 'o', ' ', 'w', 'o', 'r', 'l', 'd']
Prelude> hello
"hello world"
Prelude> 
Prelude> :t hello
hello :: [Char]
Prelude> 
Prelude> 'h':'e':'y':' ':hello
"hey hello world"
Prelude> 

You can define string using square brackets (or) by using double quotes "".

Prelude> let str1 = "Hello"
Prelude> let str2 = ['H', 'e', 'l', 'l', 'o']
Prelude> 
Prelude> str1
"Hello"
Prelude> str2
"Hello"
Prelude> 
Prelude> :t str1
str1 :: [Char]
Prelude> :t str2
str2 :: [Char]
Prelude> 
Prelude> str1 == str2
True
Prelude> [1, 2, 3] == [1, 2]
False

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