# Standard ML of New Jersey (SML/NJ)

Implementation of programming language Standard ML

Standard ML of New Jersey (SML/NJ) is a compiler and programming environment for Standard ML. It includes an interactive interpreter.

## Examples:

### Hello, World!:

Example for versions MLton, Moscow ML 2, SML/NJ 110

`print` is a built-in function defined with the following type:

``````string -> unit
``````

This means that it takes 1 string as a parameter, and returns the unit type, `()`.

``````print "Hello World\n";
``````

### Factorial:

Example for versions SML/NJ 110

This example shows the naive way to implement the factorial function. However, it is not tail recursive, since the recursive function call is not the only statement on the line. The `^` operator concatenates strings. The `print` function prints strings. The `Int.toString` function converts integers into strings.

``````fun factorial n =
if n <= 1 then
1
else
factorial (n-1) * n;

fun aux n =
if n > 16 then
()
else (
print (Int.toString n ^ "! = " ^ Int.toString (factorial n) ^ "\n");
aux (n + 1)
);
aux 0;
``````

### Fibonacci numbers:

Example for versions SML/NJ 110

This example uses straightforward recursive solution. The `print` function prints strings. The `^` operator concatenates strings. The `Int.toString` function converts integers into strings.

``````fun fibonacci n =
if n < 3 then
1
else
fibonacci (n-1) + fibonacci (n-2)

fun aux n =
if n > 16 then
print "\n"
else (
print (Int.toString (fibonacci n) ^ ", ");
aux (n + 1)
);
aux 1;
``````

### CamelCase:

Example for versions SML/NJ 110
``````val text = valOf (TextIO.inputLine TextIO.stdIn);
fun capitalize s = let
val (x::xs) = explode s
in
implode (Char.toUpper x :: map Char.toLower xs)
end;
val result = concat (map capitalize (String.tokens (not o Char.isAlpha) text));
print (result ^ "\n");
``````