Slang

Slang (Simple LANGuage) is a simple interpreted language built in Rust as a means of experimenting with Rust.

Slang is a C-like language with a syntax that should be very familiar to JavaScript programmers.

Slang is not meant to be used for serious programming, it is a toy language built as a means to learn Rust.

Running Slang

You can run Slang either in REPL mode or by executing a script file.

# runs REPL mode
$ ./slang

# runs script file
$ ./slang script.sl

Debug mode

Slang supports debug mode, this basically just vomits the internal processing out to your console as the program runs.

This can be enabled by using the debug(true); function, or can be switched off via debug(false);.

Features

The following is a non-exhaustive list of features that Slang supports.

Defining variables

let x = 5;
let y = 10;
// x == 5, y == 10

Arithmetic operations

let x = 5;
let y = 10;
let z = x + y;
// z == 15

If statements

let x = 5;
let y = 10;
let z = x + y;
if (z == 15) { z } else { -1 }
// outputs 15

Proper precedence

let x = 5;
let y = 10;
let z = x + y * 2;
// z == 25

Functions

let add = function(x, y) { x + y };
add(5, 10); // outputs 15

// same as
function add(x, y) { 
    x + y 
}

add(5, 10); // outputs 15

While loops

let f = fn() {
    let x = 0;
    while (x < 5) {
        if (x == 3) {
            return x;
        }
        let x = x + 1;
    }
    99;
};

f();

String literals

"hello" + " " + "world";
// outputs "hello world"

For loops (also arrays)

let a = [1, 2, 3, 4, 5];
for (let i = 0; i < len(a); i = i + 1) {
	print(a[i]);
}

// outputs 1, 2, 3, 4, 5

for (let i = 0; i < len(a); i++) {
	print(a[i]);
}

// also outputs 1, 2, 3, 4, 5

file operations

let f = file_open("test.txt", "w+");
file_write(f, "Hello, world!");
file_seek(f, 0, "start");
print(file_read(f));
file_close(f);

objects

let obj = {
    x: 5,
    y: 10,
    add: fn() {
        return this.x + this.y;
    },
    inner: {
        z: [1, 2, 3],
        sum: function () {
            let sum = 0;
            for (let i = 0; i < len(this.z); i++) {
                sum = sum + this.z[i];
            }
            
            return sum;
        }
    }
};

print(obj.add());
// outputs 15

print(obj.inner.sum());
// outputs 6

Classes

Slang supports class definitions with constructors and methods. Classes provide a cleaner syntax for creating objects with shared behavior.

Basic class definition

class Calculator {
    function add(a, b) { a + b; }
    function multiply(a, b) { a * b; }
}

let calc = new Calculator();
print(calc.add(2, 3));      // 5
print(calc.multiply(4, 5)); // 20

Constructors

The special construct method is called when you create a new instance with new. Use this to set fields on the instance:

class Point {
    function construct(x, y) {
        this.x = x;
        this.y = y;
    }
    
    function distanceFromOrigin() {
        Math::sqrt(this.x * this.x + this.y * this.y);
    }
}

let p = new Point(3, 4);
print(p.x);                    // 3
print(p.y);                    // 4
print(p.distanceFromOrigin()); // 5

Methods and `this`

Methods can access instance fields via this. Methods can also call other methods on the same instance:

class MathUtils {
    function factorial(n) {
        if (n <= 1) {
            1;
        } else {
            n * this.factorial(n - 1);
        }
    }
}

let math = new MathUtils();
print(math.factorial(5)); // 120

Mutating state (functional style)

Slang uses value semantics for objects. To mutate instance state, methods should return this after making changes, and callers should reassign the result:

class Counter {
    function construct(start) {
        this.value = start;
    }
    
    function increment() {
        this.value = this.value + 1;
        this;  // Return this to allow reassignment
    }
    
    function getValue() {
        this.value;
    }
}

let c = new Counter(0);
c = c.increment();  // Reassign to capture mutation
c = c.increment();
c = c.increment();
print(c.getValue()); // 3

Method chaining

Since mutating methods return this, you can chain method calls:

class StringBuilder {
    function construct() {
        this.value = "";
    }
    
    function append(s) {
        this.value = this.value + s;
        this;
    }
    
    function build() {
        this.value;
    }
}

let result = new StringBuilder()
    .append("Hello")
    .append(" ")
    .append("World!")
    .build();
    
print(result); // "Hello World!"

Multiple instances

Each instance created with new is independent:

class Box {
    function construct(val) {
        this.value = val;
    }
    
    function get() {
        this.value;
    }
}

let a = new Box(100);
let b = new Box(200);
print(a.get()); // 100
print(b.get()); // 200

Classes without constructors

Classes don't require a construct method. If omitted, new simply creates an empty instance with the class methods attached:

class Utils {
    function double(x) { x * 2; }
    function triple(x) { x * 3; }
}

let u = new Utils();
print(u.double(5)); // 10
print(u.triple(5)); // 15

How classes work internally

Classes in Slang are syntactic sugar over objects:

class Foo { ... } creates a Class object containing all method definitions
new Foo(args) creates a plain object with all methods copied in
If a construct method exists, it's called with this bound to the new instance
The modified this (with any fields set in the constructor) is returned

This means instances are regular objects that can be manipulated with Obj:: helpers:

class Person {
    function construct(name) {
        this.name = name;
    }
}

let p = new Person("Alice");
let keys = Obj::keys(p);    // ["name", "construct"]
print(Obj::has(p, "name")); // true

Higher order functions

let makeAdder = fn(x) {
    function(y) { x + y; }; // this inner fn closes over x
};

let addTwo = makeAdder(2);
print(addTwo(3)); // => 5

let addTen = makeAdder(10);
print(addTen(7)); // => 17

Monads

function isNumberGreaterThanZero(num) {
    if (num > 0) {
        Result::Ok(num);
    } else {
        Result::Err("Number less than zero");
    }
}

let resultOne = isNumberGreaterThanZero(5);
Result::andThen(resultOne, fn (num) {
    print(num);
});

let resultTwo = isNumberGreaterThanZero(-12);
Result::andThen(resultTwo, fn (num) {
    print("This shouldn't happen");
});

if (Result::isErr(resultTwo)) {
    print("failure");
}

function findValueInList(val) {
    let list = [1,2,3,4,5];
    for (let i = 0; i < len(list); i++) {
        if (list[i] == val) {
            return Option::Some(i);
        }
    }

    Option::None();
}

let optA = findValueInList(3);
Option::andThen(optA, fn (idx) {
    print("Found value in list at index");
    print(idx);
    Option::Some(idx);
});

let optB = findValueInList(-2);
Option::andThen(optB, fn (val) {
    print("Should not happen");
});

if (Option::isNone(optB)) {
    print("Value not in list");
}

Type casting

int("42");          // 42 (Integer)
float("3.14");      // 3.14 (Float)
str(123);           // "123" (String)
bool(0);            // false
bool("true");       // true

// Result-based variants
let r1 = Type::int("99");     // Result::Ok(99)
let r2 = Type::float("oops"); // Result::Err("float(): could not parse float from \"oops\"")
if (Result::isErr(r2)) { print("bad cast"); }

Regex

let t1 = regexIsMatch("hello123", "[a-z]+[0-9]+"); // true
let t2 = regexIsMatch("hello", "[0-9]+"); // false

let m1 = regexFind("abc123xyz", "\d+"); // Some("123")
let m2 = regexFind("no-digits-here", "\d+"); // None()

let r = regexReplace("foo 123 bar 456", "\d+", "X"); // foo X bar X

let c1 = regexMatch("abc123", "([a-z]+)(\d+)"); // Some(["abc123", "abc", "123"])
let c2 = regexMatch("no-digits", "(\d+)"); // None()

Namespaces and imports

namespace SomeNamespace {
    function add(a, b) {
        a + b;
    }
}

SomeNamespace::add(5, 7); // 12

Code inside a namespace is exported as a single object. Top-level code outside any namespace remains private to the file. You can import another file with a string path (absolute or relative to the current working directory):

import "lib/math.sl";
Math::sqrt(9);

If multiple files declare the same namespace, their members are merged; later imports override earlier definitions of the same member name.

Built-in pub/sub tags and chaining

You can tag functions and publish values to all subscribers of a tag. Tags are declared before a function with (:TagOne, :TagTwo); publishing uses -> :Tag. Publishes can be chained; each stage receives the return values from the previous stage (with null values dropped).

Argument shaping per subscriber:

0 params → no arguments passed
1 param → a single array of all non-null values from the previous stage
1 params → values are packed positionally; if more values than params, the last param receives the remaining values as an array; if fewer, missing params get null.

Example:

(:Square)
function square(values) {           // one-arg subscriber gets an array
    let n = values[0];
    let s = n * n;
    print(s);
    return s;
}

(:Print)
function output(values) {           // also one-arg -> array
    print(values[0]);
}

let a = 5;
let b = 7;

a + b -> :Square -> :Print          // prints 144 twice in the sample test

Monadic results for file operations

let opened = File::open("test.txt", "w+");
let f = Result::unwrapOr(opened, 0);

let res1 = File::read(123); // Result::Err()
let res2 = File::write(123, "data"); // Result::Err()
let res3 = File::write(f, 42); // Result::Err()
let _ = File::close(f);
let res4 = File::read(f); // Result::Err()

let a = Result::isErr(res1);
let b = Result::isErr(res2);
let c = Result::isErr(res3);
let d = Result::isErr(res4);

Standard library

Slang ships with a comprehensive standard library that is preloaded into the global environment whenever you run a script or the REPL.

Namespaces

Option
- Represents optional values: Some(v) or None.
- Exposed as a namespace object with the following helpers:
  - Option::Some(value) – wrap a value in an Option.
  - Option::None() – create an empty option.
  - Option::isSome(opt) / Option::isNone(opt) – boolean checks.
  - Option::unwrapOr(opt, default) – returns the inner value or a default.
  - Option::map(opt, fn) / Option::fmap(opt, fn) – transform the inner value if present.
  - Option::andThen(opt, fn) / Option::bind(opt, fn) – monadic bind; fn should return an Option.
Result
- Represents the outcome of computations that can succeed or fail: Ok(v) or Err(e).
- Exposed as a namespace object with helpers:
  - Result::Ok(value) / Result::Err(errorValue).
  - Result::isOk(res) / Result::isErr(res).
  - Result::unwrapOr(res, default) – returns inner value on Ok, default on Err.
  - Result::map(res, fn) / Result::fmap(res, fn) – transform the success value.
  - Result::andThen(res, fn) / Result::bind(res, fn) – monadic bind; fn should return a Result.
Type
- Safe, Result-wrapped casts:
  - Type::int(value) → Result::Ok(Integer) or Result::Err("...")
  - Type::float(value) → Result::Ok(Float) or Result::Err("...")
  - Type::str(value) → Result::Ok(String) (never errors)
  - Type::bool(value) → Result::Ok(Boolean) or Result::Err("...")
- Accepted inputs:
  - int: integers, finite floats (truncates), booleans (1/0), strings parsable as i64.
  - float: floats, integers, booleans (1/0), strings parsable as f64.
  - str: any value via to_string.
  - bool: booleans, integers/floats (non-zero => true), strings "true"/"false"/"1"/"0", null → false.
- Free-function aliases int(value), float(value), str(value), bool(value) perform the same conversions but raise an error instead of returning Result.
- Type introspection:
  - Type::of(value) – returns a string describing the type: "integer", "float", "boolean", "string", "array", "object", "function", "option", "result", "null".
  - Type::isInt(value) / Type::isFloat(value) / Type::isNumber(value) – numeric type checks.
  - Type::isBool(value) / Type::isString(value) – primitive type checks.
  - Type::isArray(value) / Type::isObject(value) – compound type checks.
  - Type::isCallable(value) – returns true for functions and builtins.
  - Type::isIterable(value) – returns true for arrays and strings.
  - Type::isNull(value) – returns true if value is null.
  - Type::isOption(value) / Type::isResult(value) – monad type checks.
Array
- Higher-order functions:
  - Array::map(arr, fn) – returns a new array with fn(element) applied to each element.
  - Array::filter(arr, fn) – returns a new array containing only elements where fn(element) is true.
  - Array::reduce(arr, initial, fn) – folds the array from left to right, calling fn(acc, element).
  - Array::find(arr, fn) – returns Option::Some(element) for the first element where fn(element) is true, or Option::None() if none match.
  - Array::some(arr, fn) – returns true if any element matches the predicate.
  - Array::every(arr, fn) – returns true if all elements match the predicate.
  - Array::flatMap(arr, fn) – maps each element to an array and concatenates the results.
  - Array::forEach(arr, fn) – executes fn(element) for each element (side effects only, returns null).
  - Array::groupBy(arr, fn) – groups elements by the string key returned by fn(element).
  - Array::partition(arr, fn) – splits into [matching, non-matching] based on predicate.
- Sorting:
  - Array::sort(arr) – returns a new sorted array (ascending order, homogeneous types only).
  - Array::sortBy(arr, compareFn) – custom sort using compareFn(a, b) returning negative/zero/positive.
- Searching:
  - Array::indexOf(arr, value) – returns Option::Some(index) or Option::None().
  - Array::includes(arr, value) – returns true if the value exists in the array.
- Slicing and combining:
  - Array::slice(arr, start, end) – extracts a portion (supports negative indices).
  - Array::take(arr, n) – returns the first n elements.
  - Array::drop(arr, n) – returns all elements after the first n.
  - Array::concat(arr1, arr2) – concatenates two arrays.
  - Array::reverse(arr) – returns a new reversed array.
  - Array::flatten(arr) – flattens one level of nested arrays.
  - Array::unique(arr) – returns a new array with duplicates removed.
- Zipping:
  - Array::zip(arr1, arr2) – combines into array of pairs [[a1, b1], [a2, b2], ...].
  - Array::unzip(arr) – splits array of pairs into [[a1, a2, ...], [b1, b2, ...]].
- Creation:
  - Array::range(start, end[, step]) – creates an array of integers from start to end (exclusive).
  - Array::fill(value, count) – creates an array with count copies of value.
- Utilities:
  - Array::isEmpty(arr) – returns true if the array has no elements.
  - Array::len(arr) – returns the number of elements.
- These complement the lower-level builtins like len, first, last, rest, and push.
Obj
- Object (hash map) manipulation utilities:
  - Obj::keys(obj) – returns an array of all keys.
  - Obj::values(obj) – returns an array of all values.
  - Obj::entries(obj) – returns an array of [key, value] pairs.
  - Obj::fromEntries(arr) – creates an object from an array of [key, value] pairs.
  - Obj::has(obj, key) – returns true if the key exists.
  - Obj::get(obj, key) – returns Option::Some(value) or Option::None().
  - Obj::set(obj, key, value) – returns a new object with the key set (immutable).
  - Obj::delete(obj, key) – returns a new object with the key removed (immutable).
  - Obj::merge(obj1, obj2) – returns a new object combining both (obj2 values override obj1).
  - Obj::isEmpty(obj) – returns true if the object has no keys.
  - Obj::len(obj) – returns the number of key-value pairs.
String
- Basic utilities:
  - String::trim(s) – trims leading and trailing whitespace.
  - String::toUpper(s) / String::toLower(s) – case conversion.
  - String::split(s, sep) – splits into an array of strings (sep == "" splits into characters).
  - String::join(arr, sep) – joins an array of strings with a separator.
  - String::len(s) – returns the number of characters (not bytes).
  - String::isEmpty(s) – returns true if the string has no characters.
- Searching:
  - String::contains(s, substr) – returns true if substr is found.
  - String::startsWith(s, prefix) / String::endsWith(s, suffix) – prefix/suffix checks.
  - String::indexOf(s, substr) – returns Option::Some(index) or Option::None().
  - String::lastIndexOf(s, substr) – returns index of last occurrence.
- Slicing and manipulation:
  - String::slice(s, start, end) – extracts a substring (supports negative indices).
  - String::replace(s, from, to) – replaces the first occurrence.
  - String::replaceAll(s, from, to) – replaces all occurrences.
  - String::repeat(s, count) – repeats the string count times.
  - String::reverse(s) – reverses the string.
  - String::padLeft(s, length, char) / String::padRight(s, length, char) – pads to target length.
- Character utilities:
  - String::chars(s) – returns an array of single-character strings.
  - String::charCodeAt(s, index) – returns the Unicode code point at the index.
  - String::charCodes(s) – returns an array of all character codes.
  - String::fromCharCode(code) – creates a single-character string from a code point.
  - String::fromCharCodes(arr) – creates a string from an array of code points.
Math
- Basic operations:
  - Math::abs(x) – absolute value.
  - Math::floor(x), Math::ceil(x), Math::round(x) – integer rounding.
  - Math::min(a, b), Math::max(a, b) – minimum/maximum of two numbers.
  - Math::pow(base, exp) – exponentiation.
  - Math::sqrt(x) – square root.
  - Math::sign(x) – returns -1, 0, or 1.
  - Math::clamp(x, min, max) – constrains a value to a range.
- Trigonometry:
  - Math::sin(x), Math::cos(x), Math::tan(x) – basic trig (radians).
  - Math::asin(x), Math::acos(x), Math::atan(x) – inverse trig.
  - Math::atan2(y, x) – two-argument arctangent.
  - Math::sinh(x), Math::cosh(x), Math::tanh(x) – hyperbolic functions.
- Logarithms and exponentials:
  - Math::log(x) – natural logarithm (base e).
  - Math::log10(x) – base-10 logarithm.
  - Math::log2(x) – base-2 logarithm.
  - Math::exp(x) – e raised to the power x.
- Constants:
  - Math::PI() – π (3.14159...).
  - Math::E() – Euler's number e (2.71828...).
  - Math::TAU() – τ = 2π (6.28318...).
- Random numbers:
  - Math::random() – returns a random float in [0, 1).
  - Math::randomInt(min, max) – returns a random integer in [min, max].
Time
- Current time:
  - Time::now() – returns the current Unix timestamp in milliseconds.
  - Time::nowSecs() – returns the current Unix timestamp in seconds.
- Date/time components (all take a timestamp in milliseconds):
  - Time::year(ts), Time::month(ts), Time::day(ts) – date components (UTC).
  - Time::hour(ts), Time::minute(ts), Time::second(ts) – time components (UTC).
  - Time::dayOfWeek(ts) – returns 0-6 (Sunday = 0).
- Formatting and conversion:
  - Time::format(ts, formatStr) – formats using strftime syntax (e.g., "%Y-%m-%d %H:%M:%S").
  - Time::toObject(ts) – returns an object with year, month, day, hour, minute, second, dayOfWeek.
- Utility:
  - Time::sleep(ms) – pauses execution for the specified milliseconds.
Sys
- Environment variables:
  - Sys::env() – returns an object with all environment variables.
  - Sys::env(name) – returns Option::Some(value) or Option::None() for a specific variable.
  - Sys::setEnv(name, value) – sets an environment variable.
- Process information:
  - Sys::args() – returns an array of command-line arguments.
  - Sys::cwd() – returns the current working directory.
  - Sys::setCwd(path) – changes the current working directory.
  - Sys::platform() – returns the OS name (e.g., "macos", "linux", "windows").
  - Sys::arch() – returns the CPU architecture (e.g., "x86_64", "aarch64").
- Process control:
  - Sys::exit(code) – exits the process with the given status code.
  - Sys::exec(command) – executes a shell command, returns Result::Ok({ code, stdout, stderr }) or Result::Err(error).
HTTP
- HTTP client functions (all return Result::Ok(response) or Result::Err(error)):
  - HTTP::get(url[, options]) – performs a GET request.
  - HTTP::post(url, body[, options]) – performs a POST request.
  - HTTP::put(url, body[, options]) – performs a PUT request.
  - HTTP::delete(url[, options]) – performs a DELETE request.
  - HTTP::patch(url, body[, options]) – performs a PATCH request.
  - HTTP::head(url[, options]) – performs a HEAD request.
- Options object can include:
  - headers – an object of HTTP headers.
  - timeout – request timeout in milliseconds.
- Response object includes:
  - status – HTTP status code.
  - body – response body as a string.
  - headers – response headers as an object.
Fn
- Functional programming utilities:
  - Fn::identity(x) – returns its argument unchanged.
  - Fn::constant(value) – returns a function that always returns value.
  - Fn::compose(f, g) – returns fn(x) { f(g(x)) } (right-to-left composition).
  - Fn::pipe(f, g) – returns fn(x) { g(f(x)) } (left-to-right composition).
  - Fn::apply(fn, argsArray) – calls fn with arguments from an array.
  - Fn::call(fn, ...args) – calls fn with the provided arguments.
  - Fn::negate(predicateFn) – returns a function that negates the predicate result.
  - Fn::flip(fn) – returns a function with the first two arguments swapped.
  - Fn::partial(fn, ...boundArgs) – returns a partially applied function.
  - Fn::isCallable(value) – returns true if the value can be called as a function.
Regex
- Regex helpers are available both as free functions and under the Regex namespace:
  - Regex::isMatch(text, pattern) – boolean match test.
  - Regex::find(text, pattern) – returns Option::Some(match) or Option::None().
  - Regex::replace(text, pattern, replacement) – returns a new string with replacements.
  - Regex::match(text, pattern) – returns Option::Some(arrayOfGroups) or Option::None().
- The free-function aliases (regexIsMatch, regexFind, regexReplace, regexMatch) remain available for convenience.
File
- Low-level file operations exist as free functions (file_open, file_read, file_write, etc.), but the preferred interface is the File namespace, which wraps results in Result:
  - File::open(path, mode) – returns Result::Ok(file) or Result::Err(error).
  - File::read(file) – returns Result::Ok(string) or Result::Err(error).
  - File::write(file, string) – returns Result::Ok(unit) or Result::Err(error).
  - File::seek(file, offset, origin) – returns Result::Ok(unit) or Result::Err(error).
  - File::close(file) – returns Result::Ok(unit) or Result::Err(error).
Json
- JSON interop helpers:
  - Json::parse(s) – parses a JSON string into Slang values, returning Result::Ok(value) or Result::Err(errorString).
  - Json::stringify(value) – converts a Slang value back into a JSON string, returning Result::Ok(string) or Result::Err(errorString).
Test
- The Test namespace provides basic assertion helpers designed for writing test scripts:
  - Test::assert(condition) – fails if condition is false.
  - Test::assertEq(expected, actual) – equality assertion.
  - Test::assertNotEq(expected, actual) – inequality assertion.

Top-level builtins

In addition to the namespaced modules above, a handful of helpers are exposed as top-level builtins:

len(x) – length of a string or array.
first(arr) / last(arr) / rest(arr) / push(arr, value) – basic array helpers.
print(...args) – print values to stdout (used throughout the examples).
debug(bool) – enable or disable Slang's internal debug logging.

Over time, more functionality may move into namespaced modules for better organization, but the existing free functions will continue to work for backwards compatibility.

Idiomatic stdlib usage examples

// Array + Option + Result
let xs = [1, 2, 3, 4, 5];
let firstEven = Array::find(xs, fn(x) { x % 2 == 0; }); // Option::Some(2)

// String helpers
let raw = "  hello world  ";
let cleaned = String::toUpper(String::trim(raw)); // "HELLO WORLD"

// Math + Json
let v = { x: 3, y: 4, len: Math::sqrt(3 * 3 + 4 * 4) };
let json = Json::stringify(v);
let jsonStr = Result::unwrapOr(json, "ERR");
print(jsonStr); // {"x":3,"y":4,"len":5}

// Object manipulation
let user = { name: "Alice", age: 30 };
let updated = Obj::set(user, "email", "alice@example.com");
let keys = Obj::keys(updated); // ["name", "age", "email"]

// Functional programming
let double = fn(x) { x * 2 };
let addOne = fn(x) { x + 1 };
let doubleThenAdd = Fn::compose(addOne, double);
print(Fn::call(doubleThenAdd, 5)); // 11

// Time and dates
let now = Time::now();
let formatted = Time::format(now, "%Y-%m-%d %H:%M:%S");
print(formatted); // e.g., "2024-12-19 15:30:45"

// System interaction
let cwd = Sys::cwd();
let result = Sys::exec("echo hello");
let output = Result::unwrapOr(result, { stdout: "" });
print(String::trim(output.stdout)); // "hello"

// HTTP requests (requires network)
let response = HTTP::get("https://api.example.com/data");
if (Result::isOk(response)) {
    let data = Result::unwrapOr(response, {});
    print(data.body);
}

// Type checking
let value = 42;
if (Type::isNumber(value)) {
    print("It's a number!");
}
print(Type::of(value)); // "integer"

Name		Name	Last commit message	Last commit date
Latest commit History 48 Commits
.github/workflows		.github/workflows
src		src
test_scripts		test_scripts
tests		tests
third_party/emacs		third_party/emacs
.gitignore		.gitignore
Cargo.lock		Cargo.lock
Cargo.toml		Cargo.toml
LICENSE		LICENSE
README.md		README.md

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damonswayn/slang

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