Rust to Dart

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How to convert from Rust to Dart

Converting code from Rust to Dart can seem daunting due to the differences in syntax and idiomatic use between the two languages. However, with a good understanding of both languages, you can make a smooth transition. This guide will walk you through the essentials step-by-step.

Basic Syntax Differences

Variable Declaration

In Rust, you declare a variable using the let keyword:

let x = 5;
let y: f32 = 3.2;

In Dart, variable declaration uses the var keyword for generalized types, though specifying the type is also common practice:

var x = 5;
double y = 3.2;


Both Rust and Dart allow for constant definitions, but they have different prefixes:

const MAX_POINTS: u32 = 100_000;
static HELLO_WORLD: &'static str = "Hello, world!";
const int maxPoints = 100000;
final String helloWorld = 'Hello, world!';

Functions: Syntax and Conventions

Function Declaration


fn add(a: i32, b: i32) -> i32 {
    a + b


int add(int a, int b) {
    return a + b;

Error Handling

Error Handling in Rust

Rust employs a robust error-handling mechanism using Result and Option types:

fn divide(dividend: f64, divisor: f64) -> Result<f64, String> {
    if divisor == 0.0 {
        Err(String::from("Cannot divide by zero"))
    } else {
        Ok(dividend / divisor)

Error Handling in Dart

Dart uses try, catch, and throw for error handling:

double divide(double dividend, double divisor) {
  if (divisor == 0) {
    throw 'Cannot divide by zero';
  return dividend / divisor;

Data Structures

Structs and Classes

Rust uses structs:

struct Point {
    x: f32,
    y: f32,

let p = Point { x: 1.0, y: 2.0 };

Dart uses classes:

class Point {
  double x, y;

  Point(this.x, this.y);

final p = Point(1.0, 2.0);


Vectors and Lists

Rust's Vec:

let names = vec!["Alice", "Bob", "Carol"];

Dart's List:

var names = ['Alice', 'Bob', 'Carol'];

HashMaps and Maps

Rust's HashMap:

use std::collections::HashMap;

let mut scores = HashMap::new();
scores.insert("Blue", 10);

Dart's Map:

var scores = {'Blue': 10};

Memory Management and Collections

Memory Safety

Rust: Ensures memory safety via ownership rules and borrowing.

Dart: Garbage collection handles object lifecycle.


Concurrency in Rust

Rust deploys thread-based concurrency:

use std::thread;

fn main() {
    let handle = thread::spawn(|| {
        println!("Hello from a thread!");


Concurrency in Dart

Dart uses Futures and async/await for asynchronous programming:

Future<void> main() async {
  var future = Future(() {
    print('Hello from a thread!');

  await future;


Converting from Rust to Dart involves understanding both languages' syntax and idiomatic constructs. While they share some similarities, key differences in error handling, data structures, and concurrency paradigms must be managed carefully. With practice, adapting your Rust knowledge to Dart will become more intuitive.

Remember, practice makes perfect! Now that you know the primary differences, you're well on your way to becoming proficient in both languages. Happy coding!

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