Flutter Tutorial - Dart List Utility Methods: ForEach, Map, Contains, Sort, Reduce, Where, Expand
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- Опубліковано 22 лип 2024
- Learn how to use Dart List Utility Methods such as forEach, map, sort, reduce, every, where, take, skip and expand in Flutter.
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TIMELINE
0:00 Introduction Dart List Utility Methods
0:32 List ForEach Method
1:26 List Map Method
3:32 List Contains Method
4:32 List Sort Method
5:24 List Reduce Method
6:38 List Fold Method
7:51 List Every Method
9:12 List Any Method
9:54 List Where Method
11:11 List SingleWhere Method
12:19 List Take Method
12:46 List Skip Method
13:09 List.from Method
14:24 List Expand Method
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Lots of appreciation and love from India🇮🇳
You're literally a genius.
@@HeyFlutter just never stop doing your flutter video. I'm becoming an expert with them. Firebase, frontend, backend, error fixing, widget explanation, and courses upgrade. I'm sending power to you from France. ❤️🔥✨
This was the best. Easy to understood method. Please create this kind of videos . It is very easy to understood everything. Other many videos are for advance user and not understandable by learner. I hope you got my point.
Thanks for the idea, @rv9570! 🙂 I have added it to my list of ideas for future videos!
Thanks, Johannes. Straightforward, comprehensive, and logical.
Love u So Much Brother You Save my Life Always
Great Brother, you are the best teacher I ever had.....
Thank you, Johan. I really enjoyed this video.
New to flutter here. I found something ready-made that I could use in my project, but I was having a hard time replicating it because I didn't understand the concept and the basics behind it. You made it crystal clear, and now I don't have to use the ready-made code; instead I can build it from scratch. Thank you so much. Of course, I subscribed and liked your video.
Thanks for the info! Streightforward and helpful
Man!! Your map explanation was not only the best that I saw but the only one that I understood!!! Finally I know how to use and what is the purpose of .toList() at the end!! thanks God, ops, thanks Johannes!!!!!!!!!!!!! Viva la vida!!!
This is not the purpose of the .toList() at the end. The reason we need it is that .map() produces an Iterable type (MappedIterable) instead of a List type. So if you want a List type, you have to convert it to a list with .toList();
So if you only need an Iterable (not specifically a List), you don't have to put .toList(), it will produce a new object anyway.
Thanks, OroshiX! 🙂 Yes, you are right, thanks for sharing your knowledge, great explanation! In the end, the Iterable is the parent class of the List class, which supports stepping through the values of a list. At 2:09 I just mentioned that you need to call .toList() since our input was List and therefore our output should be also of the type List and not Iterable.
It's a very helpful, fantastic explanation vedio
Johannes Milke Rocks...🙏🙏
Thank you so much for your video you have saved my from a big problem
Glad I could be of help, Thank you Essa Jamal! 😊
very useful video!
So helpful 🔥
simple and useful, good job
Awesome Content. To the point and useful.
You are better and more efficient teacher. :)
Thanks a lot Sir
You are very helpful 👍
Great tutorial. pls make a video on Navigation for web and mobile. e.g web has sidebar navgation on click again and again every route inserted in stack. this is the big problem in flutter for web
Great!
Thank you
thanks
Thank you!
Hi Louis is jy van RSA?, ek is Pierre
@@pierremarais7669 Inderdaad. Was lanklaas so opgewonde oor iets soos wat ek is oor Flutter.
Bro! How to retern & show on ListView this List "Bike" by/with new "horspover" value ... what you show on 14:33 by expand ???
Very usefull
Spread operator & Null-aware operator on Lists, Maps and Sets in Dart
Spread operator & Cascade Operator What is the function of each?
And when do we use each? also witch using with Map witch uing with list?
Thanks Johannes for all your videos and their simple explanations.
Be careful, there is an error in your map explanation:
This is not the purpose of the .toList() at the end. The reason we generally need it is that .map() produces an Iterable type (MappedIterable) instead of a List type. And generally, widgets accept only List type. So if you want a List type, you have to convert it to a list with .toList(). In this case, because you use it with [...iterable], you don't need a .toList()
So if you only need an Iterable (not specifically a List), you don't have to put .toList(), it will produce a new object anyway. Moreover, this Iterable is lazy, so we can chain several calls without worry about performance.
See here for the documentation: api.dart.dev/stable/2.12.2/dart-core/Iterable/map.html (it always produces a new object)
Thanks, OroshiX! 🙂 Yes, you are right, thanks for sharing your knowledge, great explanation! In the end, the Iterable is the parent class of the List class, which supports stepping through the values of a list. At 2:09 I just mentioned that you need to call .toList() since our input was List and therefore our output should be also of the type List and not Iterable.
Hi Johannes, if I have duplicated objects in the list e.g. if you have two Hondas in your bikes list, how would you compress or remove the duplicate item?
@@HeyFlutter many thx
Thanks, Gustavo Menezes! 🙂
You can remove duplicate items from list, like 2 Honda bikes in your case. Simply refer to this solution : stackoverflow.com/a/51446910
Hello, bro. Do you have videos for testing? If you haven't, can you give me the source, please😊
Thanks, Qadir! 🙂 Nope, I don't have testing videos. Simply read more about it here: flutter.dev/docs/testing
how can I replace an item in a list with another item in the same index? (ie delete an item and place another item in the same place as it was)
@@HeyFlutter Thanks, it was a big help! I'm from Brazil and I love your videos
Hello, Igor miranda souza! Follow this link: stackoverflow.com/questions/63757050/flutter-replacing-an-item-in-a-list, I hope it will solve your problem. Thank You 🙂
cool
👌
why is there no automatic translation into Russian (
Thank you, Flutter_kn! 🙂 Yep, this is strange, normally UA-cam is generating these captions automatically.