Go, Rust and C++ Side by Side

Why?

Recently I did a blog post where I show the basic syntax in Javascript, Python, Ruby and PHP side by side and got a pretty good response. Figured I’d do the same thing with some lower-level compiled languages. So in this post, I’ll be showing how to do many basic things in Go, Rust and C++ (Keep in mind Go and Rust were created to be modern alternatives to situations you’d use C/C++/Java for speed and efficiency).

Hello World

C++

#include <iostream>
using namespace std;
int main() {
    std::cout << "Hello World \n";
}

Go

package main
import "fmt"
func main(){
    fmt.Println("Hello World")
}
// go run HelloWorld.go

Rust

fn main() {
    println!("Hello World!");
}
// rustc HelloWorld.rs && ./HelloWorld

Declaring Variables

C++

#include <iostream>
using namespace std;
int main() {
    int num = 5;
    bool isItTrue = true;
    char str[] = "Hello World";
    std::cout << "Hello World \n" << str << endl;
}

Go

package main
import "fmt"
func main(){
    var num int = 5
    var isItTrue bool = true
    var hello string = "Hello World"
    dynamicTyping := 6
    fmt.Println("Hello World")
}

Rust

fn main() {
    let x = 5; //immutable
    let mut y = 6; //mutable
    const TYPED_CONSTANT:u32 = 100_000;
    let isItTrue:bool = true;
    let aString: str = "Hello World";
    println!("Hello World!");
}

Arrays and Key/Value Pairs

C++

#include <iostream>
using namespace std;
int main() {
    int nums[] = {1,2,3,4,5,6};
    int five = nums[1] + nums[2];
    std::cout << "Hello World \n";
}

Go

package main
import "fmt"
func main(){
    arr := [5]int{1,2,3,4,5}
    five := arr[1] + arr[2]
    fmt.Println("Hello World")
}

Rust

fn main() {
    let nums: [i32; 5] = [1,2,3,4,5];
    let five: i32 = nums[1] + nums[2];
    println!("Hello World!");
}

Functions

C++

#include <iostream>
using namespace std;
int addNums (int x, int y){
    return x + y;
}
int main() {
    int num = addNums(5, 6); //returns 11
    std::cout << "Hello World \n";
}

Go

package main
import "fmt"
func addOne(x int, y int) int {
    return x + y
}
func main(){
    num := addOne(5,6)
    fmt.Println("Hello World")
}

Rust

fn main() {
    let num: i32 = addOne(5,6);
    println!("Hello World!");
}
fn addOne(x: i32, y: i32) -> i32{
    x+y;
}

OOP

C++

#include <iostream>
#include <string>
#include <cstring>
using namespace std;
class Dog {
    //property declaration
    public:
    string name;
    int age;
    //constructor sig
    Dog(string n, int a);
    //method sigs
    void bark();
};
Dog::Dog(string n, int a){
    name = n;
    age = a;
}
void Dog::bark(){
    std::cout << "Woof! \n";
}
int main() {
    Dog sparky("Sparky", 5);
    sparky.bark();
}

Go

package main
import "fmt"
//Define a struct
type Dog struct {
    name string
    age int
}
// Struct Method
func (dog Dog) bark(){
    fmt.Printf(dog.name + " barks.")
}
func main(){
    sparky := Dog{"Sparky", 5}
    sparky.bark()
}

Rust

// declare a struct
struct Dog {
    name: String,
    age: i32
}
// declare methods
impl Dog {
    fn bark(&self){
        println!("{} is barking", self.name);
    }
}
fn main() {
    let sparky = Dog{name: String::from("Sparky"), age: 5};
    println!("{} is of age {}", sparky.name, sparky.age);
    sparky.bark();
}

In Conclusion

I hope this gives you a nice visual of what is the same and different between these languages.