Editing Clean (programming language) (section)

==Examples==
[[hello world program|Hello world]]:
<syntaxhighlight lang="clean">
 Start = "Hello, world!"
</syntaxhighlight>
[[Factorial]]:
{|
|-valign="bottom"
|<syntaxhighlight lang="clean">
fac :: Int -> Int
fac 0 = 1
fac n = n * fac (n-1)

Start = fac 10
</syntaxhighlight>
|<syntaxhighlight lang="clean">
fac :: Int -> Int
fac n = prod [1..n] // The product of the numbers 1 to n

Start = fac 10
</syntaxhighlight>
|}
[[Fibonacci sequence]]:
{|
|-valign="bottom"
|<syntaxhighlight lang="clean">
fib :: Int -> Int
fib 0 = 1
fib 1 = 1
fib n = fib (n - 2) + fib (n - 1)

Start = fib 7
</syntaxhighlight>
|<syntaxhighlight lang="clean">
fibs :: Int Int -> [Int]
fibs x_2 x_1 = [x_2:fibs x_1 (x_2 + x_1)]

fib :: Int -> Int
fib n = (fibs 1 1) !! n

Start = fib 7
</syntaxhighlight>
|}
[[Infix notation|Infix]] operator:
<syntaxhighlight lang="clean">
(^) infixr 8 :: Int Int -> Int
(^) x 0 = 1
(^) x n = x * x ^ (n-1)
</syntaxhighlight>
The type declaration states that the function is a right associative infix operator with priority 8: this states that <code>x*x^(n-1)</code> is equivalent to <code>x*(x^(n-1))</code> as opposed to <code>(x*x)^(n-1)</code>. This operator is  pre-defined in StdEnv, the Clean [[standard library]].