Let, Also, Apply, Run, With - Kotlin Scope Functions

In this video I will summarize for what you should choose which Kotlin scope function.
00:00 - Kotlin Scope Functions
00:30 - Let
05:10 - Also
07:20 - Apply
09:13 - Run
10:30 - With
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[@AlaaAlbrg]

Summary of Scope functions: let: Used to check nulls, also better than simple null check in multi-threading case also: same as 'let' but it doesn't return the last line as 'let', instead 'also' will return the object it was called on and 'not the last line!' apply: helpful function to modify objects, if you want to change in properties of the objects, and it uses 'this' instead of 'it' as we work inside the class of the object run: equivalent to 'apply', but it won't return the object it was called, instead it will return the last line with: same as 'run' but a different signature.

[@PhilippLackner]

good!

[@trungtrankim294]

Awesome. Thanks a lot man.

[@rithulraj3348]

*with()* is the combination of *let* and *run* because it does null check also, am I right?

[@hazfrd]

@@rithulraj3348 nope. In fact run is combination of with & let. Run does check nullpointer (let) and reference with this (with) , after that return the last line a.k.a lambda expression

[@hazfrd]

@@rithulraj3348 with() doesn't checking null, just for non-null. in case it is null then use let(), in case you want make some operation while checking null then use run()

[@agp1444]

also is very useful in case x = y.also { y = x } - switch values of variables without third variable

[@mahdi7236]

big brain time😉

[@TheMohit987]

😂😂😂😂 wow

[@hieuluu2495]

Awsome

[@phamhung2263]

why don't we just switch those variables with a third variable. It's more readable

[@codinginflow]

11:04 sick special effects bro .also { respect++ }

[@PhilippLackner]

pow(thanks, 10)

[@johnybaby9574]

Hi CiF~!

[@codinginflow]

@@johnybaby9574 hi

[@benjaminmorales8624]

You’re an amazing dev, thank you for all this effort and please keep it rocking!

[@PhilippLackner]

Thanks, will do!

[@ganshakumari5196]

Fantastic explanation. Much clearer than most of the online resources, Thanks Mate!

[@weather120widget8]

I really appreciate your teaching style, how you build on topics as you go. Keep up the great work.

[@larrystreehouse1124]

Simple and Concise explanation. Even though I go self-learning with Kotlin for 1 year, this is great to recall my memory and consolidate my knowledge. More importantly, you show us how to teach and explain the basic concept in an interesting and concise passages with live examples.

[@mirzasohailhussain]

Thanks Philip, you are sharing so much knowledge without any charge. I have seen so many people share only basics and then member only videos

[@damercy]

Hey man. I just learnt Kotlin. Previously I've made a few basic projects in android using Java. Fortunately,I found your channel with some really good resources to learn android dev in Kotlin. Just wanted to say a genuine thank you for putting out such great content. Please don't stop. Power to you! 🔥❤️

[@PhilippLackner]

Thanks! You're totally welcome

[@achalbadgujar9519]

Finally a practically helpful explanation of these scope functions

[@FatalRescue]

Wow, thank you for opening my eyes. I was just using let as shorthand for the null check and did not realize how useful it actually is!

[@PhilippLackner]

yes, let > null-check

[@TheMohit987]

Your videos are very helpful. Your way of teaching is simply awesome.

[@usherg4158]

o man, I have been reading lots of explanation and still not get it until watching yours. Great example and explanation, thanks for making this video.

[@firuzaaliyeva5382]

Was literally just thinking about finally studying these, and you just uploaded. Thanks!

[@iJuce]

same wtf

[@PhilippLackner]

yes, I can read your mind

[@mz-coder]

@@PhilippLackner LOL!

[@jackli1924]

Awesome video！You explained very simply and concisely. Thanks a lot Philipp!

[@ziakhan-tk7rk]

Your tutorials are addictive I watch them repeatedly

[@adarshdev3810]

It is awesome you explains concepts so simple. Hats off

[@original_anu]

Simple, crisp explanations ❤

[@TheMaciak90]

Very well explained. Thank you mate.

[@ianlipa9826]

Your tutorials are a big help bro. Thanks!

[@salimmazariboufares3118]

Cool, that was pretty much understandable by someone who is new to Kotlin.

[@Aweklin]

I already liked the video before watching because it is the topic I had pinned on my todo list to research this week. Thanks Philipp

[@PhilippLackner]

Awesome, thank you!

[@leosvxy]

thank you! , was so easy to understand your explanations

[@carloscambon5402]

You explain very clearly. Thank you.

[@Alvin-dg9pq]

Fantastic explanation, thanks a lot.

[@EngDesper]

Thank you for the great explanation!

[@imagetag4618]

Wow. its so much clear understand. thank you. keep it up.

[@FreeKnowledge]

Fantastic explanation.

[@ramakrishnavjoshi]

Thanks for this video, Philipp. :)

[@yuanyuechen2183]

Thank you, I really learn a lot from you

[@koutheirelbehi4384]

This boi is on another level !

[@yuripanov9670]

You're the best! Thanks!

[@zareahmer5949]

You are Great man . Stay blessed

[@bjugdbjk]

Such a fab explanation, Thanks a ton, You should really do a lot more this kind of standalone videos of advanced concepts of Kotlin, it will b super helpful.

[@PhilippLackner]

Thank you!

[@thearpansircar]

An absolute psychic. I was going through Kotlin's Documentation and, suffice to say, it confused the fuck outta me.

[@rahulchandrabhan]

One of the best explanation. Simple and Easy. Great man

[@PhilippLackner]

Glad you liked it

[@theonlyarjun]

just what i was searching for, awesome man

[@PhilippLackner]

Glad to hear it!

[@mahetachirag8395]

Your tutorial are awesome.

[@DeniizDenizDeniz]

How can you dislike this kind of tutorial 4 people? HOW?

[@telurasinmontasik2406]

Very clear explanation

[@ajaykumarvishwakarma4720]

Really informative video. Thanks a lot

[@tomaslopez9999]

Thanks for creating this video.

[@techmarinar]

Thanx man this was very helpful 😊

[@tyrannus00]

Schönes Video, gut erklärt 👍

[@tanishqsehgal2593]

Very Well Explained

[@mdjahidulislam9205]

I was waiting for it.you just read my mind

[@PhilippLackner]

yes, I did

[@r.j.jeninjoseph4975]

Really helpful thanks man

[@lyawileh.a8741]

Thanks for useful explanation. 🙏

[@sckly43]

awesome video bru

[@marinbeslo7841]

your tutorials are just awesome!

[@PhilippLackner]

Thanks a ton!

[@themichael8767]

Thank You very much, Sir!)

[@user-uu8rn6wf4u]

Thank you!! 🤩

[@anvarzaripboyev5730]

Thanks bro, it is very usefull tutorial. Good luck!

[@alexnovikov1609]

Thank you!

[@indraj6669]

Great explanation

[@DreckbobBratpfanne]

i liked to use with eg in viewbinding, because then i can avoid typing the binding variable name xD, also you can use multiple of them within each other what is also pretty nifty

[@aunghtayoo337]

Thanks. Philipp

[@Qrzychu92]

I don't even programm in Kotlin (fellow dotnet dev here!), but this videos are very cool :) I'd love to have this tuff in C#

[@mohamadalighezelbashyan4482]

Great!! thanks ❤

[@brucebane7401]

amazing tutorial!!!!!

[@RackaApps]

Super helpful

[@vibinjoby]

Amazing just what i wanted after reading the docs and wondering where exactly all these get used

[@walkmn]

Good explanation for the latest one 😄

[@dreamer6228751]

Thanks bro, it's excellent video !

[@PhilippLackner]

You're welcome!

[@mohammedelamin1563]

So helpful 😎

[@abuiman5251]

Thanks!

[@leonidas_30052]

O melhor, muito bom os vídeos.

[@imnithish]

great vid as usual man

[@PhilippLackner]

Glad you enjoyed it

[@aneessaleh2870]

amazing video mate , keep it up please

[@PhilippLackner]

Thanks a lot!

[@sudarshanh.s.521]

this is awesome

[@andriibibik39]

Very Good!

[@jayeshsuthar5590]

crystal clear....

[@fourcade7851]

Thank You Bro

[@PhilippLackner]

No problem

[@abdelsttarahmed8821]

you are legend man i wish seeing you doing a video on Providing offline capabilities with NetworkBoundResource

[@PhilippLackner]

I do that in my ktor course on pl-coding.com

[@mandroidx1474]

Appreciated Keep it up❤

[@PhilippLackner]

Thank you, I will

[@mehdiparsaei1867]

The best in the world! I am sure!

[@shreyashachoudhary480]

Great!

[@hirarkiardipratamakiki8777]

i often use 'with 'to declare componen with viewbinding,such as onClickListener, and etc.

[@pratikchauhan989]

Good one 👏👏

[@PhilippLackner]

Thanks ✌️

[@shreyashchoudhary7413]

Epic!

[@jeffreyrudolph6334]

so much better than the kotlin udacity explanations

[@DeepSingh-wk5ts]

Thanks

[@PhilippLackner]

Welcome

[@amiribrahim01]

thank you.

[@PhilippLackner]

Welcome!

[@shidqi100]

Great video expected man love your explanation, just asking will you make videos outside topic of android and mobile dev in general ex: Ai, web or desktop?

[@PhilippLackner]

Not planned right now, but I also don't say I never will. I might do some flutter videos in the next time

[@highs_and_lows4665]

This was explained very well. Udemy eat your heart out!😀 Many thanks!

[@erfansn869]

thanks

[@PhilippLackner]

Welcome

[@ankitpareek8979]

I have an usecase where i need to call a suspend function(some network call) on completion of it i need to perform other local task. I am trying to use also there but getting unexpected results. Can u explain this !!!

[@mohammadamirkanjoori138]

nice

[@lional4898]

With is useful when using string builder. No need to create new variables. Simply call toString at the end

[@soontaek]

I left you some feedback on your previous video (Preference Datastore)

[@PhilippLackner]

Thanks, I saw it! :)

[@Nithin_Coorg]

Crisp!

[@MrLukasw44]

but is that mean that apply is thread safe? so if we got an object and we would like to run 3 methods on that object and that object is a global variable so the question is if we use apply those 3 operations will be thread safe?

[@serhatkarakoca]

Thanks for video.. Also i see use function. What is the use function? This is also scoped function

[@tejas5331]

Hey can you tell me how to fetch data about places from API and show on Map in Android?

[@renaldyhiunarto4369]

coming from the future and seeing you with beard kinda weird lmao. Anyway, love all your vids

[@rsobies]

in this case number is a property so it is a function. a function can return different results and that's why it is considered as mutuable. inside let block you are dealing directly with a field of the class. 'it' is a field, not a property. so it is immutable

[@nishantpattani3053]

what is difference between return@let and simple return in let function

[@scottbiggs8894]

I never realized before that Philipp looks like the Elvis operator ?: ;)

[@jasperjohnsoncalapini]

Can I do something else inside 'apply' and 'run' for example textbox.run { //is this a good practice val x = 10 val squareX = x*x // or maybe some loops text = "$x" } and one more thing, would you prefer 'apply' over 'run' when when modifying views/components in android? Thanks

[@PhilippLackner]

no, I would move out of these functions whatever you can move out, this doesn't look very readable to me. If you just modify views and don't care about the return value it doesn't matter if you use apply or run

[@Alchemist10241]

This video definitely belongs to 5 percent group according to 95/5 rule (80/20 rule). Great and precise job 🚀