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

[@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()

[@codinginflow]

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

[@PhilippLackner]

pow(thanks, 10)

[@johnybaby9574]

Hi CiF~!

[@codinginflow]

@@johnybaby9574 hi

[@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

[@2chotti]

This is the best video on scopes. Thanks

[@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

[@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!

[@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.

[@weather120widget8]

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

[@benjaminmorales8624]

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

[@PhilippLackner]

Thanks, will do!

[@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

[@ganshakumari5196]

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

[@ziakhan-tk7rk]

Your tutorials are addictive I watch them repeatedly

[@TheMohit987]

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

[@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

[@tanishqsehgal2593]

Very Well Explained

[@salimmazariboufares3118]

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

[@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.

[@telurasinmontasik2406]

Very clear explanation

[@thearpansircar]

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

[@achalbadgujar9519]

Finally a practically helpful explanation of these scope functions

[@jeffreyrudolph6334]

so much better than the kotlin udacity explanations

[@tomaslopez9999]

Thanks for creating this video.

[@carloscambon5402]

You explain very clearly. Thank you.

[@ianlipa9826]

Your tutorials are a big help bro. Thanks!

[@yuripanov9670]

You're the best! Thanks!

[@rahulchandrabhan]

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

[@PhilippLackner]

Glad you liked it

[@anvarzaripboyev5730]

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

[@FreeKnowledge]

Fantastic explanation.

[@walkmn]

Good explanation for the latest one 😄

[@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

[@adarshdev3810]

It is awesome you explains concepts so simple. Hats off

[@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#

[@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!

[@mdjahidulislam9205]

I was waiting for it.you just read my mind

[@PhilippLackner]

yes, I did

[@jackli1924]

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

[@original_anu]

Simple, crisp explanations ❤

[@mehdiparsaei1867]

The best in the world! I am sure!

[@zareahmer5949]

You are Great man . Stay blessed

[@leosvxy]

thank you! , was so easy to understand your explanations

[@imagetag4618]

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

[@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!

[@themichael8767]

Thank You very much, Sir!)

[@alexnovikov1609]

Thank you!

[@yuanyuechen2183]

Thank you, I really learn a lot from you

[@LittleWasteClub]

Thank you for the great explanation!

[@mahetachirag8395]

Your tutorial are awesome.

[@marinbeslo7841]

your tutorials are just awesome!

[@PhilippLackner]

Thanks a ton!

[@theonlyarjun]

just what i was searching for, awesome man

[@PhilippLackner]

Glad to hear it!

[@VeronikaDoma-f5y]

Thank you!! 🤩

[@TheMaciak90]

Very well explained. Thank you mate.

[@lyawileh.a8741]

Thanks for useful explanation. 🙏

[@mohammedelamin1563]

So helpful 😎

[@RackaApps]

Super helpful

[@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

[@sckly43]

awesome video bru

[@techmarinar]

Thanx man this was very helpful 😊

[@mohamadalighezelbashyan4482]

Great!! thanks ❤

[@vibinjoby]

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

[@abuiman5251]

Thanks!

[@koutheirelbehi4384]

This boi is on another level !

[@Alvin-dg9pq]

Fantastic explanation, thanks a lot.

[@indraj6669]

Great explanation

[@r.j.jeninjoseph4975]

Really helpful thanks man

[@ajaykumarvishwakarma4720]

Really informative video. Thanks a lot

[@aneessaleh2870]

amazing video mate , keep it up please

[@PhilippLackner]

Thanks a lot!

[@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

[@sudarshanh.s.521]

this is awesome

[@hirarkiardipratamakiki8777]

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

[@lional4898]

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

[@himanshugoeldelhi]

Try executing that code if some people don't understand what 'let' does number?.let { number = null val num2 = it + 1 } Here 'let' actually saved the global value of number and even in case number becomes null in 'let' block , still 'it' value will remain the same which you defined before

[@dreamer6228751]

Thanks bro, it's excellent video !

[@PhilippLackner]

You're welcome!

[@ramakrishnavjoshi]

Thanks for this video, Philipp. :)

[@imnithish]

great vid as usual man

[@PhilippLackner]

Glad you enjoyed it

[@tyrannus00]

Schönes Video, gut erklärt 👍

[@Alchemist10241]

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

[@brucebane7401]

amazing tutorial!!!!!

[@serhatcd]

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

[@scottbiggs8894]

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

[@riyupapa39]

I usually use run like this var a:String?=null //When i want do something if only a is not null, a?.run{ //todo }

[@jayeshsuthar5590]

crystal clear....

[@highs_and_lows4665]

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

[@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

[@shreyashachoudhary480]

Great!

[@vigneshdroid1654]

Hi Bro, Your videos are very helpful for me. You Know Tamil language Bro?.

[@renaldyhiunarto4369]

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

[@andriibibik39]

Very Good!

[@ucPhamQuoc]

the beard is impressive

[@fourcade7851]

Thank You Bro

[@PhilippLackner]

No problem

[@mandroidx1474]

Appreciated Keep it up❤

[@PhilippLackner]

Thank you, I will

[@coffeedude]

I learnt that you can use 'also' to swap variables but I don't understand why it works. ie: var foo = "foo" var bar = "bar" foo = bar.also { bar = foo } print(foo + bar) // barfoo

[@soontaek]

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

[@PhilippLackner]

Thanks, I saw it! :)

[@shreyashchoudhary7413]

Epic!

[@vikasdaily122]

How squaredFunctionI = (i*i) can be a function without return type and body.

[@MetehanBOLAT]

You said "run" is the same as "with", but "with" is almost the same as "apply" isn't it? Because "with" and "apply" return expected types. run does not return. also { Thank you very much, it was a very informative video by the way. } :)

[@cinemovieone]

O melhor, muito bom os vídeos.

[@pratikchauhan989]

Good one 👏👏

[@PhilippLackner]

Thanks ✌️

[@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?

[@DeepSingh-wk5ts]

Thanks

[@PhilippLackner]

Welcome

[@satheeshguduri]

If condition null check replaced by let