Hello, world!

Primary Development Environment

$ uname -a
Linux ASUSMIN 5.15.153.1-microsoft-standard-WSL2 #1 SMP
Fri Mar 29 23:14:13 UTC 2024 x86_64 x86_64 x86_64 GNU/Linux

C

$ gcc --version
gcc (Ubuntu 11.4.0-1ubuntu1~22.04) 11.4.0
Copyright (C) 2021 Free Software Foundation, Inc.
This is free software; see the source for copying conditions.
There is NO warranty; not even for MERCHANTABILITY or FITNESS
FOR A PARTICULAR PURPOSE. 

$ gcc hello_c.c -o hello_c

$ ./hello_c

C++

$ g++ --version
g++ (Ubuntu 11.4.0-1ubuntu1~22.04) 11.4.0
Copyright (C) 2021 Free Software Foundation, Inc.
This is free software; see the source for copying conditions.
There is NO warranty; not even for MERCHANTABILITY or FITNESS
FOR A PARTICULAR PURPOSE.

$ g++ hello_c++.cpp -o hello_c++

$ ./hello_c++

JavaScript

$ node -v
v20.12.2

$ npm -v
10.5.0

$ nvm -v
0.40.1

$ node hello_javascript.js
Server running at http://localhost:3000

$ curl localhost:3000
Hello, world!

Express

$ npm install express

$ npm ls | grep express
├── [email protected]

$ node hello_express.js
Server running at http://localhost:3000

$ curl localhost:3000
Hello, world!

TypeScript

$ npm install typescript

$ tsc -v
Version 5.6.2

(A) Run with npx ts-node

$ npx ts-node hello_typescript_ts.ts
Server running at http://localhost:3000

$ curl localhost:3000
Hello, world!

(B) Run with ts-node

$ npm install -D ts-node

$ npm ls | grep ts-node
├── [email protected]

$ ts-node hello_typescript_ts.ts
Server running at http://localhost:3000

$ curl localhost:3000
Hello, world!

(C) Transpile TypeScript to JavaScript

$ tsc hello_typescript_ts.ts

$ node hello_typescript_ts.js
Server running at http://localhost:3000

$ curl localhost:3000
Hello, world!

Express

$ npm install -D @types/express

$ npm ls | grep express
├── @types/[email protected]
├── [email protected]

$ ts-node hello_express_ts.ts
Server running at http://localhost:3000

$ curl localhost:3000
Hello, world!

Python

$ python --version
Python 3.11.7

$ python hello_python.py

Flask

$ pip install flask
$ flask run

$ curl localhost:5000
Hello, world!

Go

$ go version
go version go1.23.1 linux/amd64

$ go build hello_go.go

$ ./hello_go

Java

$ java -version
openjdk version "21.0.6" 2025-01-21
OpenJDK Runtime Environment (build 21.0.6+7-Ubuntu-122.04.1)
OpenJDK 64-Bit Server VM (build 21.0.6+7-Ubuntu-122.04.1, mixed mode, sharing)

$ javac -version
javac 21.0.6

$ javac HelloJava.java

$ java HelloJava

Kotlin

$ kotlin -version
Kotlin version 2.1.0-release-394 (JRE 21.0.5+11-Ubuntu-1ubuntu122.04)

$ kotlinc -version
info: kotlinc-jvm 2.1.0 (JRE 21.0.5+11-Ubuntu-1ubuntu122.04)

$ java -version
openjdk version "21.0.5" 2024-10-15
OpenJDK Runtime Environment (build 21.0.5+11-Ubuntu-1ubuntu122.04)
OpenJDK 64-Bit Server VM (build 21.0.5+11-Ubuntu-1ubuntu122.04, mixed mode, sharing)

$ kotlinc hello_kotlin.kt -include-runtime -d hello_kotlin.jar

$ java -jar hello_kotlin.jar

Run a Kotlin script file

$ kotlin hello_kotlin.kts

$ kotlinc -script hello_kotlin.kts

Rust

$ rustc --version
rustc 1.81.0 (eeb90cda1 2024-09-04)

$ cargo --version
cargo 1.81.0 (2dbb1af80 2024-08-20)

$ rustc hello_rust.rs

$ ./hello_rust

R

$ R --version
R version 4.1.2 (2021-11-01) -- "Bird Hippie"
Copyright (C) 2021 The R Foundation for Statistical Computing
Platform: x86_64-pc-linux-gnu (64-bit)

$ Rscript hello_R.R

Ruby

$ ruby --version
ruby 3.3.5 (2024-09-03 revision ef084cc8f4) [x86_64-linux]

$ rbenv --version
rbenv 1.3.0-4-gc335ab8

$ ruby hello_ruby.rb

Elixir

$ elixir --version
Erlang/OTP 24 [erts-12.2.1] [source] [64-bit] [smp:16:16] [ds:16:16:10] [async-threads:1] [jit]

Elixir 1.12.2 (compiled with Erlang/OTP 24)

$ elixir hello_elixir.exs

Crystal

$ crystal --version
Crystal 1.17.0 [d2c705b53] (2025-07-16)

LLVM: 18.1.8
Default target: x86_64-unknown-linux-gnu

$ crystal run hello_crystal.cr

Swift

$ swift --version
Swift version 6.0 (swift-6.0-RELEASE)
Target: x86_64-unknown-linux-gnu

$ swift hello_swift.swift

Julia

$ julia --version
julia version 1.11.6

$ julia hello_julia.jl

making changes...