Go to Dart

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How to convert from Go to Dart

Converting code from one programming language to another can be a daunting task, especially if you are not familiar with the target language. In this guide, we will walk you through the process of converting Go (Golang) code to Dart, ensuring you understand each step and keep the code functional. If you are proficient in Go but new to Dart, this will be particularly useful.

Understanding Both Languages

Overview of Go

Go is a statically-typed, compiled language designed for simplicity and performance. It is known for its efficient concurrency support, garbage collection, and strong support for multithreading.

Overview of Dart

Dart is also a statically-typed language, developed by Google. It's designed for building frontend web and mobile applications due to its integration with modern front-end frameworks like Flutter. Dart is JIT-compiled during development and AOT-compiled for release builds, making it versatile for different stages of development.

Basic Syntax and Structural Conversion

Variable Declarations

In Go, variable declarations look like this:

var x int = 10

or using shorthand:

x := 10

In Dart, variables are declared like this:

int x = 10;
var x = 10; // Dart infers the type

As you can see, the transition is straightforward, but remember Dart uses a semi-colon ; at the end of the statement.

Function Definitions

A simple Go function looks like:

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

In Dart, this function would be written as:

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

Notice the change in the syntax specifically around the function keyword and parameter types coming before the variable name in Dart.

Control Structures


Go if-else statement:

if x > 0 {
} else {

Dart equivalent:

if (x > 0) {
} else {

Dart syntax is quite similar, but ensure parentheses around the condition and a semi-colon at the end of each statement.


Go for-loop:

for i := 0; i < 10; i++ {

Dart for-loop:

for (var i = 0; i < 10; i++) {

The structure remains almost unchanged, but always remember the semi-colons.


Goroutines vs. Dart Isolates

Go is known for its Goroutines:

go func() {

Dart uses Isolates for concurrency:

import 'dart:async';
import 'dart:isolate';

void isolateTask(message) {
  print('Isolate: $message');

void main() {
  Isolate.spawn(isolateTask, 'Message to isolate');

Dart's concurrency model is different and may require a more significant change in logic, as it uses Isolates, which are separate memory heaps.

Packages and Imports

In Go, packages are imported as follows:

import "fmt"
import "math"

In Dart, you would write:

import 'dart:math';
import 'package:your_package/your_file.dart';

Dart uses single quotes for the import paths and has a specific way of importing packages.

Error Handling

Error handling in Go:

if err != nil {
  fmt.Println("Error:", err)

Dart uses exceptions:

try {
  // Code that might throw an exception
} catch (e) {
  print('Error: $e');

This is a significant shift as Dart relies on try-catch blocks instead of checking for nil as in Go.

Tools and Tips for Conversion

  • Automated Tools: Currently, no perfect automated tool exists to convert Go to Dart, but understanding the similarities and differences will assist in manual conversion.
  • Testing: After conversion, ensure extensive testing to catch any logical errors.
  • Practice: Hands-on practice with small snippets and gradually increasing complexity will make the transition smoother.


Converting code from Go to Dart requires an understanding of both languages' syntax, control structures, concurrency models, and error handling mechanisms. By following the guidelines outlined in this guide, you will be well on your way to effectively translating your Go applications into Dart, leveraging its capabilities for front-end and mobile development.

Don't forget to test thoroughly and take it step-by-step to ensure a smooth conversion process.

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