Dart - Hello World

Hello World Program is a basic Simple First program or application to code and learn any new programming language.

It just displays the hello world string to the console.

This post shows how to write a hello world application in Dart Programming language.

Dart Hello World example program

Following are steps to create a Hello World program in Dart programming language

• First, Open any source code editor
• Create a file called HelloWorld.dart
• Add the following code

//Hello World Sample First Program
void main() {
  print('Hello World First Program');
}

The above program contains three parts.

Comments : The comments are ignored by the compiler and provide a useful message about the line or block of a code.

 //Hello World Sample First Program

main(): It is a function called by dart runtime and Entry point for dart program to execute.

Every dart executable code has a main() function and it does not take any arguments i.e empty arguments. Every function in the dart has a return type. main() function has a return type void. It does not return anything.

The function body is enclosed with {}

• Print(): It is used to log the string or a message to the console. It is a standalone IO function.

Next, compile and run the program.

How to run dart program

We can compile and run the program in many ways in dart programming

• Command-line

  • Open terminal command line.

  • Go to directory or folder where program exists.

  • run the below command(dart HelloWorld.dart)

    A:\work\dart>dart HelloWorld.dart
    Hello World First Program
    

• online browser dartpad

  • open dartpad in browser

  • Create a new Pad

  • Type the HelloWorld code or copy it

  • Click on the Run button on the opened pad.

  • you will see the Hello World First Program message in the Console window.

  • Source Code Editor or IDE

• you can open any editor of your choice such as VSCode

• Run inbuilt compiler support or open terminal and run as per command line