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Aswin Gopinathan ๐Ÿ’™๐Ÿ‡ฎ๐Ÿ‡ณ Profile picture
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20 Dec, 11 tweets, 3 min read
This thread consists of all the ๐Ÿงตs i have written on various concepts in Dart and Flutter!

I will update this as i go onโ€ฆ

Anything for this wonderful community that has given me everything ๐Ÿ’™

#flutter #flutterdev
A ๐Ÿงต on Future v/s Streams
A ๐Ÿงต on using Futures the right way
A ๐Ÿงต on an alternative approach to using Futures in your code
A ๐Ÿงต on Unit Testing in Flutter
A ๐Ÿงต on using Mockito for Unit Testing in Flutter
A ๐Ÿงต on Widget Lifecycle in Flutter
A ๐Ÿงต on Final v/s Const
A ๐Ÿงต on 20 CLI commands for Dart and Flutter Developers
A๐Ÿงตon Closures in Dart
A ๐Ÿงต on List comprehension and Spread operator in Dart

โ€ข โ€ข โ€ข

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More from @GopinathanAswin

Aswin Gopinathan ๐Ÿ’™๐Ÿ‡ฎ๐Ÿ‡ณ Profile picture
20 Dec
You have used em' but you wanna know how it works.

A brief introduction to Closures in Dart ๐Ÿ’™

A thread ๐Ÿงต
So, how do you define the onTap callback for GestureDetector?

Something like this right ๐Ÿ‘‡๐Ÿป
So, what is the datatype of the data member onTap?

It is ----> void Function()

But, if you open the code for GestureDetector, onTap will be of type "GestureTapCallback", which inturn is an alias for : void Function()
Read 14 tweets
Aswin Gopinathan ๐Ÿ’™๐Ÿ‡ฎ๐Ÿ‡ณ Profile picture
19 Dec
A ๐Ÿงต on my favourite 20 CLI commands for Dart and Flutter Developers!

#flutter #flutterdev
1. Create a Dart application
2. Run a Dart file
Read 23 tweets
Aswin Gopinathan ๐Ÿ’™๐Ÿ‡ฎ๐Ÿ‡ณ Profile picture
18 Dec
Final vs Const

A ๐Ÿงตon the battle of Immutability โš”๏ธ

#flutter #flutterdev
Immutability means you cannot change the data stored in a variable during the entire life time of your app.

But why do we use immutable variables ?
Imagine you are working on an exam portal for your school. You are given the task of building an on-screen scientific calculator.

The most common symbol you use in maths is ฯ€ (Pi) which is equal to 3.1415.

This remains the same even after 100 years right ?
Read 19 tweets
Aswin Gopinathan ๐Ÿ’™๐Ÿ‡ฎ๐Ÿ‡ณ Profile picture
17 Dec
Everything you need to know about Widget Lifecycle in Flutter

A thread ๐Ÿงต

#flutter #flutterdev
There are two types of Widgets in Flutter:

1. Stateless Widget : They do not change their state throughout the lifetime of your application. They are like a constant widget.

2. Stateful Widget: They are dynamic, they change their state based on the External Interactions.
A side note: Stateless widgets can change their state if some state management tools are used like Provider, Bloc, etc

But thatโ€™s out of the scope of this thread.

Letโ€™s continue ๐Ÿ‘‡๐Ÿป
Read 19 tweets
Aswin Gopinathan ๐Ÿ’™๐Ÿ‡ฎ๐Ÿ‡ณ Profile picture
15 Dec
Mockito + Unit Testing in Flutter 101

This thread talks about Verify and Stubbing using Mockito๐Ÿงต

#flutter #flutterdev
If you are pretty new to Unit Testing, I suggest you read through my previous thread on Unit Testing:

So, what is Mockito and why do we need to use them while testing?

๐Ÿ‘‡๐Ÿป
Read 18 tweets
Aswin Gopinathan ๐Ÿ’™๐Ÿ‡ฎ๐Ÿ‡ณ Profile picture
14 Dec
Unit Testing in Flutter 101

A mega thread ๐Ÿงต

#flutter #flutterdev
Unit Testing is the most important testing method, that is usually performed by the developer.

Unit Testing tests each individual modules (method, function or a class) for its proper functioning.
This indirectly means you have to maintain loose coupling in your application.

That is, each function or a method should be able to perform only one functionality.

This way it will be easier to test and even debug you codebase.
Read 19 tweets

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