hey, my name is christopher and I am a vue and flutter developer also interested in blockchain who loves to write the things I am learning
hey, my name is christopher and I am a vue and flutter developer also interested in blockchain who loves to write the things I am learning
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as someone who loves to build flutter apps when I first encountered with some of the flutter interview questions which is supposed to test your grasp on the very basics of flutter framework, I felt a bit ignorant that I didn’t understood these things early on, so while I was going through some of the concepts of flutter I prepared a list of my favorite flutter interview questions that will help you in your job interviews and also understanding some of the core principles of dart. I answered all of these questions based on my personal experience with flutter
even though I was familiar with javascript language which is the language used for react native, I found dart language a lot elegant and suitable for big projects. features like types, out of the box support for streams makes dart language a more suitable language for this case. also when it comes to UI, flutter is design-focused which means it used a design-centric approach and it is a huge advantage that makes flutter apps beautifully designed event without trying too much.
even though firebase is a lot popular and easier to integrate in your app than custom backend, but I prefer to use custom backend cause it gives me more control on my app. I am mainly using http package to send requests to my API and wrapping the received object in dart class(model) is my usual way of working with rest APIs also I prefer to use nodejs and mongodb for building my APIs
futures are used for values that may become available at some point in future and we know that after getting the value it is not going to change and it will be the same until we make another request.
streams are used for values that changes overtime. e.g. think of a chat screen that needs to be changes after each message, in this case it is best to use streams and wait for each response and react to it accordingly(show it in screen)
Flexible widget is used to adjust the size of the children in a row or column relative to their parents, so if the parent row gets bigger, the child wrapped with Flexible widget will also get bigger
Expanded widget is used to make children to take full width/height of their parents
Flexible widget with FlexFit.tight will behave the same as Expanded widget
it totally depends on the complexity of the task but generally I don’t like to use packages unless it takes a lot of time to build it from scratch. I don’t feel like full-fledged developer when I am too reliant on third-party packages.
main function is an entry point to the app it is independent of flutter and it is dart specific functionality but runApp function is flutter specific and it behaves like the entry point of the widget tree and returns all of the widgets that is used in our app.
easy to learn. dart is a java-like language that any body who has spent time with an OOP language will have an easy time picking it up
portable. there is no need for you to install anything to work with dart. dart comes with dartPad which is a web interface that allows you to write dart programs online
type-safety
You don't need to use Keys most of the time, the framework handles it for you and uses them internally to differentiate between widgets. There are a few cases where you may need to use them though. for instance if you have a child you want to access from a parent, you can make a GlobalKey in the parent and pass it to the child's constructor. Then you can do globalKey.state to get the child's state
single subscription streams: it is the most common type of streams which contains a sequence of events, which is part of a whole. it will deliver the event in the correct order and without missing any of them. if any of the events are missing then the rest of the stream makes no sense. e.g. downloading a file from web
broadcast streams: it is another type of steam that can deliver the events one at a time without the knowledge of previous events. e.g. mouse events in browser.
hot reload is a nice feature of flutter that allows developers to see the result of their changes to code in a very short time(even less than a second) also it keeps the state of the widgets so you can still access the old data in your widgets after hot reload. hot restart on the other hand completely resets the state and it takes longer than hot reload.
you can reach me via twitter for any recommendation. thanks for reading
as someone who loves to build flutter apps when I first encountered with some of the flutter interview questions which is supposed to test your grasp on the very basics of flutter framework, I felt a bit ignorant that I didn’t understood these things early on, so while I was going through some of the concepts of flutter I prepared a list of my favorite flutter interview questions that will help you in your job interviews and also understanding some of the core principles of dart. I answered all of these questions based on my personal experience with flutter
even though I was familiar with javascript language which is the language used for react native, I found dart language a lot elegant and suitable for big projects. features like types, out of the box support for streams makes dart language a more suitable language for this case. also when it comes to UI, flutter is design-focused which means it used a design-centric approach and it is a huge advantage that makes flutter apps beautifully designed event without trying too much.
even though firebase is a lot popular and easier to integrate in your app than custom backend, but I prefer to use custom backend cause it gives me more control on my app. I am mainly using http package to send requests to my API and wrapping the received object in dart class(model) is my usual way of working with rest APIs also I prefer to use nodejs and mongodb for building my APIs
futures are used for values that may become available at some point in future and we know that after getting the value it is not going to change and it will be the same until we make another request.
streams are used for values that changes overtime. e.g. think of a chat screen that needs to be changes after each message, in this case it is best to use streams and wait for each response and react to it accordingly(show it in screen)
Flexible widget is used to adjust the size of the children in a row or column relative to their parents, so if the parent row gets bigger, the child wrapped with Flexible widget will also get bigger
Expanded widget is used to make children to take full width/height of their parents
Flexible widget with FlexFit.tight will behave the same as Expanded widget
it totally depends on the complexity of the task but generally I don’t like to use packages unless it takes a lot of time to build it from scratch. I don’t feel like full-fledged developer when I am too reliant on third-party packages.
main function is an entry point to the app it is independent of flutter and it is dart specific functionality but runApp function is flutter specific and it behaves like the entry point of the widget tree and returns all of the widgets that is used in our app.
easy to learn. dart is a java-like language that any body who has spent time with an OOP language will have an easy time picking it up
portable. there is no need for you to install anything to work with dart. dart comes with dartPad which is a web interface that allows you to write dart programs online
type-safety
You don't need to use Keys most of the time, the framework handles it for you and uses them internally to differentiate between widgets. There are a few cases where you may need to use them though. for instance if you have a child you want to access from a parent, you can make a GlobalKey in the parent and pass it to the child's constructor. Then you can do globalKey.state to get the child's state
single subscription streams: it is the most common type of streams which contains a sequence of events, which is part of a whole. it will deliver the event in the correct order and without missing any of them. if any of the events are missing then the rest of the stream makes no sense. e.g. downloading a file from web
broadcast streams: it is another type of steam that can deliver the events one at a time without the knowledge of previous events. e.g. mouse events in browser.
hot reload is a nice feature of flutter that allows developers to see the result of their changes to code in a very short time(even less than a second) also it keeps the state of the widgets so you can still access the old data in your widgets after hot reload. hot restart on the other hand completely resets the state and it takes longer than hot reload.
you can reach me via twitter for any recommendation. thanks for reading
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