Hello World Program Using Dart 2

Brief About Execution of Dart Code

The execution of Dart code operates in two modes—Just-In-Time (JIT) compilation or Ahead-Of-Time (AOT) compilation:

JIT compilation
A JIT compilation is where the source code is loaded and compiled to native machine code by the Dart VM on the fly. It is used to run code in the commandline interface or when you are developing a mobile app in order to use features such as debugging and hot reloading.

AOT compilation
An AOT compilation is where the Dart VM and your code are precompiled and the VM works more like a Dart runtime system, providing a garbage collector and various native methods from the Dart software development kit (SDK) to the application.

Dart contributes to Flutter's most famous feature, hot reload, which is based on the Dart JIT compiler, allowing fast interactions with live code swaps.

To Demonstrate The 'Simple Hello World' program of Dart, we only need the Windows CMD

Note: we created the "simple_hello_world.dart" in Visual Studio Code first.

(base) C:\Users\Ashish Jain\OneDrive\Desktop>dir
Volume in drive C is Windows
Volume Serial Number is 8139-90C0

Directory of C:\Users\Ashish Jain\OneDrive\Desktop

12/20/2021  01:48 PM    <DIR>          .
12/20/2021  01:48 PM    <DIR>          ..
12/20/2021  01:48 PM               173 simple_hello_world.dart
12/20/2021  01:59 PM               905 write-up.html
                11 File(s)     31,664,672 bytes
                11 Dir(s)  66,662,928,384 bytes free

(base) C:\Users\Ashish Jain\OneDrive\Desktop>type simple_hello_world.dart
main() { // the entrypoint of an Dart app
    var a = 'world'; // declaring and initializing variable
    print('hello $a'); // call function to print to display output
}
(base) C:\Users\Ashish Jain\OneDrive\Desktop>
(base) C:\Users\Ashish Jain\OneDrive\Desktop>dart simple_hello_world.dart
hello world 

Yet Another Hello World Program

File: hello_world_with_for_loop.dart 


(base) C:\Users\Ashish Jain\OneDrive\Desktop>dir
Volume in drive C is Windows
Volume Serial Number is 8139-90C0

Directory of C:\Users\Ashish Jain\OneDrive\Desktop

12/20/2021  03:46 PM    <DIR>          .
12/20/2021  03:46 PM    <DIR>          ..
12/20/2021  01:15 PM                86 hello_world_with_for_loop.dart
                14 File(s)     31,774,195 bytes
                11 Dir(s)  63,985,053,696 bytes free

(base) C:\Users\Ashish Jain\OneDrive\Desktop>type hello_world_with_for_loop.dart
void main() {
    for (int i = 0; i < 5; i++) {
    print('hello ${i + 1}');
    }
}

(base) C:\Users\Ashish Jain\OneDrive\Desktop>dart hello_world_with_for_loop.dart
hello 1
hello 2
hello 3
hello 4
hello 5

(base) C:\Users\Ashish Jain\OneDrive\Desktop> 

Tags: Technology,Flutter,