Yard/README.md

Yard

Yard is an funny programming language compiler and interpreter written in pure Rust.
Its a functional language, having no concept of classes or inheritance. Types are static and must be known at compile time.

Primitve data types 

The language has 4 primitive data types:

• bool a 1 byte boolean value which is either true or false. It can also be initalised with a random value at compile time iwht maybe
• int a 8 byte two's complement signed integer with 64-bit of storage space
• rat a 8 byte IEEE-754 double precision floating point value
• str a dynamically sized immutable string wich for now can only be used with the concatonation operator ..

NOTE: no custom data types such as structs or classes are supported.

Keywords

Syntax	Description	Example
despite	Inverted if. Only executes the following block if the expression is false	despite 3 > 4 { // code block }
loop	While(true)-Loop. Loops forever until either yield, ret, break are used. Loop take no boolean expression.	loop { // code block }
cont	Short form for “continue”. Jumps to the next iteration of a loop	loop { cont; }
break	Exits a loop immediately	loop { break; }
yield	Returns from a function with an argument as return value	foo() = int { yield 4 }
ret	Short form for “return”. This keyword takes no argument and returns from a function. NOTE: if ret is used in a function with a return type, an error occurs.	foo() { ret // exit function }
please	Decides on runtime wether a block should be executed or not.	please { // code }
unless	Works like a while loop except inverted. it will only run if the condition is false.	unless x > 5 { // code }
goto	jumps to a specified label	'label // code goto label;

Example code

-- compute the factorial
-- in a recursive and functional way
fac(x:int) = int {
    despite x != 1 {
        yield 1;
    }

    yield fac(x - 1) * x
}

number = rat 34	# this is a function without arguments and a braceless body

// main function
main = int {

    result = fac(number);

    println("The Factorial of " .. number .. " is: " .. result);

    yield 0;
}