The Umpteen Programming Language
This repository provides the reference implementation for the Umpteen Programming Language, bootstrapped from Rust. Umpteen is currently in active development and frequent breaking changes are expected until v1.0.x
As such, Umpteen is not yet recommended for use in production
Syntax
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Variables
Create mutable or immutable* bindings with var and let respectively
var x = 10; # x is mutable
let y = 20; # y is immutable
x = 0; # OK ✅
y = 0; # ERROR 🚫
*NOTE: Immutable bindings are not yet implemented
Scope
# Global Scope
let a = 10;
print(a); # 10
{
# Block-scope
print(a); # 10
let a = 20;
print(a); # 20
}
print(a); # 10
Shadowing*
Immutable bindings support shadowing within the same scope
let a = 10; # OK ✅
let a = 20: # OK ✅
a = 30; # ERROR 🚫
*NOTE: Shadowing within the same scope is not yet implemented
Mutable bindings can be reassigned, however they are not permitted to be shadowed within the same scope. Conversely, shadowing is permitted within a narrower scope
var a = 10; # OK ✅
{
var a = 20; # OK ✅
}
a = 30; # OK ✅
var a = 40 # ERROR 🚫
Conditionals
Test an expression with the if keyword
if true {
print("This code prints!"); # ✅
}
if false {
print("This code is unreachable"); # ⛔
}
As well as else and else if
let something = false;
let somethingElse = false;
if something {
print("Something!");
} else if somethingElse {
print("Something else!");
} else {
print("Neither!");
}
Loops
Execute statements multiple times with the loop keyword. Use break to exit early from the loop body, or continue to halt execution of the current iteration and skip to the next one
var i = 0;
loop {
print(i);
i += 1;
if i > 10 {
break;
}
}
Functions
Declare a function with the fnc keyword. Parameters require type annotations. Annotations for return types are required, unless the function returns Empty
fnc fib(n: Number) -> Number {
if n <= 1 {
return n;
}
return fib(n - 2) + fib(n - 1);
}
Data Types*
Empty: No valueBoolean:trueorfalseNumber: IEEE 754 double-precision floating point representation of numericsString: A series of charactersObject: Compound data types passed by reference instead of by valueFnc: Function type representing a discrete collection of executable instructions
NOTE: User-defined functions are not yet implementedList: Dynamic Array type, representing a one-dimensional dynamically resizeable numerically indexed collection
*NOTE: The full specification for Umpteen's type system is not yet defined, definition of all types is subject to change prior to v1.0.x
WARNING: Umpteen is still in active development and frequent breaking changes are expected prior to v1.0.x. Not yet recommended for production use!
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