Getting Started with Dart (1/∞)

(Once again the lines above are editable so go ahead and replace my name with yours and press play button ▶️)

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If you have missed my previous blog, you may find it here

developers.goalist.co.jp

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Let's start learning the fundamentals of Dart.

In this tutorial, we shall learn about the basics of Dart Programming Language.

DartPad

Having the Right Tool for the Right Job is Important. Isn't it?

DartPad (https://dartpad.dartlang.org/) is an open-source tool that lets you play with the Dart language in any modern browser.

Yeah!! you read it correctly... No Installation... No Environment Setup...
DartPad is all you need to start learning/coding in Dart. Just open a DartPad on your browser and start writing your dart program.

On the left, you have workspace to write program and after clicking ▶️ Run button output of the program will be displayed in the console on right.

Dart Fundamentals

Program Structure

All Dart programs have to start with main()
main() is what we call a function and a function basically is a part of the program that does something. (more on that in subsequent bog :D stay tuned)

In the above code, program flow stars with void main()thereafter program prints Hello on console with print function print("Hello")

All dart programs have to start with main()

Variables and Typing

As you know, in programming, variables are used to store information to be referenced and used by programs. In other words, a variable is a value that can change, depending on conditions or on information passed to the program.

There are two ways to declare a variable in Dart

1) Dynamic Typing

2) Static Typing

Dynamic Typing

Dynamic typing is a weak typing which you might have seen in Javascript where a variable can have different types based on the type of value assigned to it.

Dynamic Typing : Variables can have different type

Let's try declaring and initializing variables with Dynamic Typing



In case of weak typing; type of a variable change depending on the circumstances.
In the above program, variable var a can hold a value of any type (string, integer, boolean etc.)
When not initialized all variables declared with var identifier always hold null value.

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Side Note：

Single Line Comment in Dart Start with "//"
e.g.
// This is a single line comment

Multi Line Comment in Dart is enclosed in "/**/"
e.g.
/*
* This is supposed to be
* a multi-line comment.
*/

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Static Typing

Static typing is a strong typing which is similar to other programming languages like Java, C more recently Typescript, where type is stated while declaring the variable and cannot be changed later.

Static Typing : Type of the variable is stated while declaring it and cannot be changed.

Life is easy with Strict Type checking, isn't it?

Learn about Dart in details here

www.dartlang.org

じゃ、That's it for this post... will come back with more on this...
Till then happy learning... :)