Mp programming language

Introduction

Mp is a simple programming language that is designed to be easy to learn and use. It is a dynamically-typed language with a focus on simplicity and readability.

Syntax

Keywords

Keyword	Description
if	conditional statement
else	conditional statement
while	loop statement
let	variable declaration
fn	function definition

Data types

Type	Description	Implemented	Example
Number	integer or float	Yes	10, 3.14
String	sequence of characters	Yes	"hello world"
Boolean	true or false	Yes	true, false
Array	ordered collection of values	Yes	[1, 2, 3]
Object	unordered collection of key-value pairs	Yes	{ "name": "Alice", "age": 25 }
Function	user-defined function	Yes	fn add(a, b) { return a + b; }
Nil	empty value	Yes	nil

Operators

Operator	Description	Implemented
+	addition	Yes
-	subtraction	Yes
*	multiplication	Yes
/	division	Yes
%	modulo	No
==	equal	Yes
!=	not equal	Yes
>	greater than	Yes
<	less than	Yes
>=	greater than or equal to	Yes
<=	less than or equal to	Yes

Built-in functions

Function	Description	Implemented
print(expr)	print the value of expr to the console	Yes
input()	read a string from the console	Yes
len(str)	return the length of str	Yes
int(str)	convert str to an integer	No
float(str)	convert str to a float	No
str(num)	convert num to a string	No
type(expr)	return the type of expr as a string	No

Statements

In Mp, any statement has a value of nil and cannot be assigned to a variable.

Statement	Description
let a = 10;	variable declaration
fn add(a, b) { return a + b; }	function definition
1+1;	expression statement
if (a > 10) { print("a is greater than 10"); } else { print("a is less than or equal to 10"); }	conditional statement
while (i < 10) { print(i); i = i + 1; }	loop statement

• single-line expressions are also statements.
• The last expression in a block expression is automatically wrapped in a return statement.

Expressions

Any expression has a value (which can be nil).

Expression	Description
expr1 + expr2	addition
expr1 - expr2	subtraction
expr1 * expr2	multiplication
expr1 / expr2	division
expr1 % expr2	modulo
expr1 == expr2	equal
expr1 != expr2	not equal
{expr1; expr2; ...; exprn;}	block expression

Examples

examples/example.mp

Comments

// This is a single-line comment

/*
This is a
multi-line comment
*/

Variable declaration

let a = 10;

Function definition

fn add(a, b) {
    return a + b;
}

Block expression

{
    let a = 10;
    let b = 20;
    return a + b;
}