Object-oriented Programming in JavaScript: Made Super Simple | Mosh

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Object-oriented programming in JavaScript: learn all about objects, prototypes, prototypical inheritance, this and more.
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TABLE OF CONTENT:
00:00: What is OOP?
01:46: Four Pillars of OOP
08:50: Setting Up the Development Environment 11:07: Objects
11:53: Object Literals
14:58: Factories
17:50: Constructors
23:27: Constructor Property
25:53: Functions are Objects
31:09: Value vs Reference Types
37:00: Adding or Removing Properties
40:54: Enumerating Properties
43:45: Abstraction
47:48: Private Properties and Methods
51:55: Getters and Setters
57:32: Exercise
59:42: Solution
Want to learn more from me? Check out my blog and courses:
programmingwithmosh.com
/ programmingwithmosh
/ moshhamedani

[@PetttCZ]

MOSH, I'm in IT for 25+ years.. I've seen stuff :O) This is by far the best organized, tutored, and well thought through course. People should be learning from you how to do this... respect. Petr

[@syedkashifhassankazmi7269]

Computer sciences vs Information technology? Which would you recommend?

[@badripaudel77]

Computer science I think is more diverse.

[@rakinrahman890]

@@syedkashifhassankazmi7269 The one which you have more passion in. But yeah as @Badri Upadhyay said, computer science is more diverse.

[@nnaemekanweke]

@@syedkashifhassankazmi7269 Computer science

[@LonaM4E]

Glad to hear that, Pett. It's my first approach to Javascript OOP (did it before with PHP) and this video makes it super clear!

[@sebbyapudo7357]

I learnt Python, SQL and Java from your Tutorials and I'm here to learn JavaScript from you again. You not only teach how to write code and the syntax but also how to think like a proffessional software engineer. You are the best Mosh

[@ArthurSilveira]

I cannot believe this video is free... This is the the best javascript tutorial I have ever seen.

[@theamanjs]

This is video from full course on OOP JavaScript. You can visit codewithmosh.com for full course.

[@cvuop]

Lubo video video video

[@kartikm5030]

No bro, watch namaste javascript

[@zacdejarnette1184]

👍 like Jayapa

[@zacdejarnette1184]

Thank you for 🌳 free session

[@jenniferl2146]

Love your videos, Mosh ❤I did struggle with tutorials. What really worked for me were Books and Mosh`s Videos. Edit: For those asking, I started learning with a basic book named Javascript In Less Than 50 Pages, which is very beginner friendly. Then I improved my skills with another one named Head First Javascript Programming. With those books I finally learned and wanted to share what worked for me.

[@gugulethukheswa4605]

Thank you for sharing

[@imtanuki4106]

Unlike most online code tutorials, this (series) is well-organized, clearly and simply explained and it moves along at a good clip without being overwhelming! Kudos!

[@akugoms7736]

00:00 : What is OOP? 01:46 : Four Pillars of OOP 08:50 : Setting Up the Development Environment 11:07: Objects 11:53 : Object Literals 14:58 : Factories 17:50 : Constructors 23:27 : Constructor Property 25:53 : Functions are Objects 31:09 : Value vs Reference Types 37:00 : Adding or Removing Properties 40:54 : Enumerating Properties 43:45 : Abstraction 47:48 : Private Properties and Methods 51:55 : Getters and Setters 57:32 : Exercise 59:42 : Solution

[@HuaJarry]

thanks, this index is really awesome, very conveinient. how did do that?

[@abraaoazevedo5077]

He did it by just watching the video and taking note of the each part and his minute.

[@codecrayon9120]

@@abraaoazevedo5077 Or he just copied it from the video description.

[@CameronChardukian]

@@codecrayon9120 Brilliant hahaha

[@stickz9871]

@@codecrayon9120 Useful tho, dont be a beoch. The desc didnt have the link

[@harvindersingh9170]

Finally, I understood what OOP is actually and why it is different from functional JS. "Thank you very much, Mosh, for providing this premium quality content for free."

[@James-lw3gi]

I mean, seriously, this is the next level of free learning content on KZbin. So many videos out there on coding. But for me, so far, this is the best laid out course I've found. Kudos to Mosh! I'm going to deep dive on your channel so hard :)

[@aiGuyReal]

This is by far the best tutorial I have ever seen in my life. It is so well organised, well-mannered and you've made JavaScript seem like a piece of cake. Truly magnificent! Keep it up.

[@menardmaranan]

Just an update for new viewers. The `class` syntax is now widely available in JS after ES6. It is somewhat a syntactic sugar to defining a constructor function like shown in the video.

[@olganedykhalova3323]

Probably the most aesthetically pleasing on-line JS course I have ever had. :)

[@AlokTripathi]

great explanation Mosh, you are the simple, concise and best.

[@skyline2022]

Mosh I come from the VHDL Verilog background to understand OOP. You given here an excellent knowledge and awesome lecturing. Love your videos. Now I am more loving to learn software programs after watching your videos. It is just not the knowledge gain, but you really inspiring and made to jump into a full fledged learner on JS and C++. Simply incredible work you doing here and helping the Software community. Thank you

[@NandorSzucs]

Mosh you give the best, cleanest, explanation on everything. Great teacher!

[@daniellaerachannel]

a very good explanation, keep teaching like this! thanks

[@weblead7396]

thanks mosh, you are one of my best teacher. best of luck.

[@hassanramazan6822]

Really great! The points that I couldn't have got yet in anywhere else have got here... Thanks MOSH

[@BillClinton228]

It's a very good tutorial... it's just a pity that JS is terrible for OO

[@ragtop63]

Great tutorial. I had a little bit of trouble with the exercise but I eventually figured it out. One thing I did differently was in my "duration" getter, I added an 'if' clause to check if the stopwatch was running. If it was, I set the duration to the current lapsed time at that moment, then returned 'duration'. That way you would always be able to see the duration, even if you haven't stopped the stopwatch yet.

[@kflo411]

Your awareness of your viewers' different programming contexts make this video very unique, in the JS space. Every mention of how the equivalent is done in C#/Java is much appreciated..!

[@johnnychun2017]

It is one of the best tutorial with very straightforward and step to step. Unfortunately I missed your course sales. I will look forward for next time. Huge thank for this.

[@BobbyBundlez]

If it’s udemy just wait like an hour for the sales again lol

[@ishfaqmaknoo]

@@BobbyBundlez 😆😆

[@emanuelmateusinacio7873]

The amount of knowledge I learned from your video is insane. You're one of the best coding tutors I've ever found on youtube. Thanks for your videos. I learned a lot just in this video alone

[@igs4112]

This is great, i had before clear many aspects from OOP, but now i feel i got even more knowledge about it, thanks Mosh for the tutorial! :]

[@shwetamulay414]

Hello Mosh, I Loved this video. I got most of the concepts clear. please continue on posting JavaScript concept videos(with coding examples as you already do !) or some JS real time projects. Thanks a lot!

[@prassanthkc]

Thanks Mosh for this great wonderful tutorial. Keep going.

[@raanaalizadeh]

I'm in love with your tutorials Mosh , Thank you

[@PINGPONGROCKSBRAH]

Thank you for making the font in your tutorials BIG so that I can actually read it when I have two windows open on my tiny laptop screen.

[@dopetag]

You are the man! You explain things in a really simple way. Thank you for your work!

[@munishgarg75]

We do have classes in JavaScript. The classes were introduced after ES5 in the JS.

[@serpentav422]

Can someone link a KZbin video tutorial so I can know how to use classes?

[@munishgarg75]

@@serpentav422 bro just search classes in JS on KZbin , you will surely get one!!!

[@ethanlal4517]

@@serpentav422 He talks about classes at the end of his modern ES6 and Typescript videos :-) kzbin.info/www/bejne/hHTakpKunpWIq8U or kzbin.info/www/bejne/hJuxYWOZgpZrkJY

[@sheikabdullah8209]

Your teaching is amazing man., no one can beat u., I strongly suggest ur videos who want expert in JS. 100000 likes

[@omaralsadidev]

Hi Mosh, first of all, I would thank you for your amazing videos. I have +3 years exp as a dev. What I like about your courses is your way of explanation. The way you teach is likely the way of the academic teaches but with a magic touch! Most instructors on KZbin ignore the identifications like what closures, abstraction, ...etc mean? and they are so important to know especially for the interviews!

[@themorningstar9458]

Hi Mosh! Thank you for this tutorial. I just subscribed!!

[@ShwetaKalariya]

Hey Hi Mosh, I must say your tutorials super awesome..

[@rammaheshwari3008]

Mosh is a Gift to Planet Earth ❤

[@ethanlal4517]

True :)

[@devsheepboi]

As an italian, I almost drop out of my chair seeing a salad on top of that spaghetti dish at 2:40 😅 Other then that, EVERY SINGLE WORDS on this video still actual in 2023!! Hands up to you 🎉

[@SAJID-zs2gf]

that's the best video on OOP in JS. everything is so well explained Thanks!

[@sonnychiba5270]

You should write a Mosh framework that allows people to easily create video tutorials with clear visuals. Your tutorials are great and easy to follow

[@hasiburrahman9392]

Your tutorial is Awesome. Thanks Mosh

[@clever_dude]

This is one of the best Tutorial i have ever seen on any platform because of animations and teaching skills of he. please keep doing such awesome videos.

[@octavius1992]

49:25 : Best closure explanation for me so far. Thank you Mosh!

[@d3j4v00]

Have been self-teaching myself code since covid-19 got rolling and i feel very lucky to have found your channel today. I've made more progress in 2 hours than the previous 2 months in terms of capacity and confidence with JavaScript

[@adityamantri7828]

I'm happy for you! :)

[@soultouchingsongs]

Excellent.. Thank you so much. 👍

[@mikejakusz1493]

The first time I watched this video, I was very confused. I'm back one month later, and I understand it this time around. If this didn't click the first time, don't give up!

[@jasminepvo]

Coming from 100Devs, I am a new subscriber. Loved how organized and easily explained everything was!

[@Ganamabunta08]

I think I understand OOP JS a little better now. I'll still need to get back at apply and call. Thanks a lot !

[@kashifumar4552]

One semester of work is done in about an hour. A very very great lecture.

[@NikhilsNest]

loved this tutorial, I was shifting from C# to node.js finding trouble in implementing OOPs in js, this made it a cake walk for me

[@magdazelezik9073]

very well prepared tutorial, comprehensive and simple :) thanks

[@user-oy9ib1ko8l]

Thank you! I finally start to feel like I understand objects!

[@AureliaCasts]

Great tutorial on OOP, thanks!

[@shivikatripathi5010]

Thanks MOSH for the wonderful video. The videos are in simple easy to understand language which generates interest amongst learners. The course is perfectly organised and explained. Please do make elaborated videos too for react and JS.

[@subramanian121]

Thanks for detailed video Mosh, this has really helped me to upskill my JS knowledge on the area of OOP.

[@dommcica]

Hi Mosh! Great tutorial, it really helped me a lot to understand the basics. I will definitely continue with the rest of your videos. But I found the example with increase() function a bit confusing. I am not skilled enough, so maybe I am mistaken, but at 34:15 - 34:42 the same result (number = 10, not 11 as you stated in video) will return (if we add "return" of course) because of operator i++, which returns a value before increment.

[@ibtehaj95]

I'm sure you've found this out by now, but just to be clear for others, Mosh and you are both right in this regard. When you pass a variable as an input parameter to a function, its copy is being passed, not the original variable, hence any changes made inside the function will remain inside and never make out of that function.... unless you use a return statement to update the variable outside the function (as you said). To add onto this, this problem is solved by using pointers in C++, thru which you can pass the "reference" of that variable to a function and then no copy is created.

[@k23raj2]

Fullstack developer=== traversy media + MOSH . Thanks to both channels which made many learners to programmers. Pls like if u agree.

[@sam0070070071981]

so far the best video on OOPs java-script. I really appreciate your hard-work and efforts.

[@newthepanch]

omg dude, you rock so bad, i've been digging around looking for a good js tutorial or book and i came to you by a facebook group, im going to the complete course and become a pro, thank you so much.

[@SohaibShaheen]

Heads up for those coming to this tutorial in 2023, setting variables like shown in example: let duration, startTime, endTime = 0; will actually lead duration to be undefined and when you try to add seconds to it in stop function, it will produce NaN. Correct way is: let duration = 0, startTime = 0, endTime = 0;

[@kid_kulafu_1727]

I wish all professors are like you. Please have a lot of children and teach them the way you thought us. Itll help the future generations.

[@Wedneswere]

Once up a time, before standardized tests, all teachers were actually teachers.

[@jurjenvanderhoek316]

Wow, i am watching this now, and so far this is the best explanation of OOP i have ever encountered. Thank you!

[@peppermintdior]

Love your teaching style and also the animation in the video makes it easy to understand. Thank you sir ♥

[@pouyajabbarisani]

I would like to explain oop in #arrowFunctions as methods a little bit for dear developers in here: If you use factory function, then you can NOT use #this keyword in it because it refers to the window object. But, If you use constructor function, then you can use #this keyword because it refers to our own object.

[@liadoz4369]

43:45 - It called Encapsulation, not Abstraction. Abstraction is something else in OOP

[@sharansingh4956]

Best vid found in js, for intermediates and experinced js devs so far. Definitely gonna buy the course 😃

[@ricardomilos5451]

מוש היקר, כיוון שאף אחד לא הגיב לך כאן בעברית. רציתי שתראה את זה. אני מאוד מודה לך על ההנגשה וההסברה שאתה עושה. זה מאוד מוערך וכיף ביותר! אני לא יודע אם זה כי אני מבין מאוד את המבטא שלך בגלל השפה, אבל אתה בעיני מסביר הכי טוב ולעניין וזה מה שהופך אותך למורה טוב!

[@juandig]

Finally a tutorial on how to write OOP in JS ;-; Thanks a lot, it makes sense and I don't know why I couldn't get to this by myself. It's very simple :)) The most interesting thing for me was using the "in" operator to check whether an key is in an object or not though, I've always used "Object.keys(obj).indexOf("key") > -1" 😅

[@shreedharsharma4745]

seems like you might know what I need. I want to become a front-end web dev, the course I'm currently doing doesn't provide me with the basics of javascript, should I watch this video?

[@juandig]

@@shreedharsharma4745 honestly mate, I can't learn with courses and stuff. I learned programming by trying out different stuff. It started with keybinders with Autohotkey (simple scripting language) and I just advanced as I tried out new stuff. Get yourself some random web page from the internet, maybe something from dribble and try to create your own copy of that website locally. Think abt stuff you would do differently. Check out some portfolios of devs and look at their projects. The best way to learn programming in my opinion is by trying. This video helped me because I already knew how object oriented programming works with other languages and I never really thought abt it in JavaScript. This video gave me a better understanding of how functions and objects etc work in JavaScript and helped me organizing my codebase in JavaScript projects :)

[@shaswatkumarparida6179]

Great tutorial Mosh, my only concern is I felt during the factory vs constructor function part, it got very muddled up and confusing. But apart from that, it was very comprehensive.

[@breadpitt7557]

I agree. I think a simpler example would help. I'm still learning, and that part tripped me up.

[@TheDMTLover]

Thank you Mosh. I'm starting to learn JS coming from an RPG/ILE AS/400 background. I'm glad I came across you. Many thx.

[@malakkataie7226]

Mosh was just AMAZING at explaining OOP, I have learned so much in 1h! BIG THANKSSS

[@georgesmith3022]

Mosh I come from an OOP background and I was really confused with objects in Javascript. Fortunately, this tutorial cleared up a lot of things. However, I am wondering if these are worth knowing since ES6 defines proper objects via classes and not by functions as shown here. Will this be covered in your course? thanks

[@sanal4492]

Well that's not true. The classes added in ES6 are just syntactical sugar behind which things work just as before. Javascript has always been a prototypical based Object Oriented Programming language.

[@msbrdmr]

@@sanal4492 so there is a class notation (syntactically) but in background, it works as a constructor function.

[@seiko8027]

This is a great video! I've recommended it to many of my classmates. Just a small suggestion, maybe in the example, instead of 'circle, radius, location...', you can use something easier to understand like 'user's info', 'apples', 'shopping list' etc. to make the learning process even more smoother. I know that circle is easy to understand already XD but every time I see radius and stuff like computeOptimumLocation, it takes me 1 second to react >

[@hk_build]

Explaination is too good!! thank you very much for making programming EASY..

[@AbhishekKumar-fl8bw]

A MUST watch video before interviews!! Thanks Mosh

[@AamirKhan-ci5gt]

JavaScript is the language i hate the most because of its syntax. Now only because of MOSH's tutorials....................... I am full-stack JavaScript developer and love the JavaScript the most.

[@Tux0xFF]

Same for me, i now like js es6 because of his tutorials, makes sense, it finally clicks.

[@nitishsingh535]

Plz tell me....I don't know what a JavaScript do or why it uses so much syntax...what do they do with a web page...

[@iLoveTurtlesHaha]

@@nitishsingh535 You need a course that caters to beginners. I hate to spam Mosh's channel but if he doesn't have a beginners course for web dev check out Andrei N's "The complete Web Developer" on Udemy. If you can find a beginners course from Mosh, I highly recommend Mosh's over anyone else because his teaching style is better. He makes you understand concepts on a deeper level - something you'll be thankful for if you are trying to find work in the industry.

[@skjahir1091]

thanks mosh for such informative tutorial

[@DevOtionSynthax]

@@nitishsingh535 Try this: www.udemy.com/javascript-basics-for-beginners/ Mosh's begginers course, I used it and learned a lot!

[@zedal1]

Thumbs up if you are tired of that bespectacled Udemy advert guy who is always going: "python is where its at...Y'know...you should take this online course at Udemy....bla bla bla". He seems to follow me wherever I go on KZbin.

[@jidaasare7021]

Hahahahaaa, even after six months this advert still persists. Same here. I am just fed up.

[@Cognitoman]

yeah hes a son of a bitch

[@KeepItFresh02]

@@Cognitoman lol.....

[@denniszenanywhere]

That guy is back again, EST, 5:34 pm, April 18.

[@aventurando4502]

adblock

[@krisek98]

God damn big thanks for that course, thats what I needed to be introduced into JavaScript after 4 languages I know already. Again, BIG THANKS!

[@rennishj]

Thank You so much for taking then time to create this awesome video and making available for free.

[@migueltoledopy]

You lost me when you said on 10:44 :: "This is no for begginers, it's for intermediate level developers, so you need at least three months of experience programming on javascript" So I'll practice and see you in 3 months sir, or less, who knows :D great video btw

[@natnaelalemayehu9112]

I just love the background music

[@SeriesTube01]

It's a programming class in a jazz bar. 👍

[@p3r1n1]

it's classy (pun.js)

[@gabrielsales7402]

I love this so much :D Thanks for this in-depth explanation.

[@simonugorji]

I understood every bit of your explanation. Thank you so much for this video Mosh 😊😊

[@DjSeymur]

You taught so much in the introduction, I thought the video ended at 8:48. lol

[@gizmo928]

I subscribed :) I love learning new things. I do have a programmer background only from school so I expect to not be completely lost. Thank you!!

[@afsanazamannipa7711]

I am currently following this playlist of JS. This video is awesomeee!! Can't thank enough for this video.

[@Dreadly]

20:30 - Why does this return Circle and not another? I thought the new operator pointed this to the newly created object.

[@ahmadmuqadas78]

im so confused when he says in javascript we don't have concept of classes while we do have class in ES6.

[@user-jq9kz6yf4s]

So i need to understand Java😬

[@luisanamora2363]

I finally understand getters and setters. You are fantastic, thank you so much 💜

[@nimamoradianzadeh379]

I am a .Net developer and interested on learning JS. always had some problem with understanding the JS. I found this course really helpful as it also compares the C# and JS . thanks a lot

[@geekynerd24]

Me:- I dont know coding and i am not intrested Mosh:- I am going to make him programmer

[@pierolp1202]

what theme are you using? btw, your videos are awesome!

[@Fernando-du5uj]

its called Ayu

[@rezakhosroshahi]

Thanks, Mosh. I really need something like this about OOP. compact simple and useful.

[@antenehmedia201]

the best tutorial and best finishing the course outline you are great mosh keep doing it

[@EricFransen1]

18:32 "in JavaScript we don't have the concept of classes" said while explaining ES6 new JavaScript features.

[@aranguren12]

@@programmingwithmosh Oh god, is the class syntax completely useless then? Can at least be used as a good practice?

[@Denis-ge2xu]

I almost cried for the clarity of your teaching methodology! Graciasss

[@gangstaberry2496]

Liked and shared, thank you as always for your straight forward explanations!

[@vandeljasonstrypper6734]

38:24 Ok now I know why strongly-type devs say "Javascript is a cancer"

[@BLABLABLABLABLABL298]

That's why we have TypeScript

[@gamerattempts9218]

I guess because there are a lot of functions and thing that you can do wrong but the good side is that JavaScript make amazing stuff

[@EGG-Academy]

@@gamerattempts9218 kull

[@trappedcat3615]

I prefer factory functions over new objects. Less maintanence.

[@ARQAlejandroM]

can you explain what do you mean with less maintanence, please? :-)

[@trappedcat3615]

Alejandro Montes depending on what contexts and how the new object is used, it may require a lot binding of the "this" keyword.

[@littlered55555]

Circle.call({ },3); but if it is nameless how do we access it? I tried " const another1 = Circle.call({ },3); " but it is undefined in my browser. Any thoughts?

[@haddonjames5829]

excellent walkthrough of basic OOP principles. Thanks mosh

[@Gorr2010]

presentation and structure of material done so well Thank you for your great input!

[@gustavstreicher4867]

What do you mean Javascript doesn't have classes? It was added in ES6.

[@clammerify]

it's not REAL classes in traditional sense. it still just a regular function underneath.

[@gustavstreicher4867]

@@clammerify True, but if you can use it in the language then its part of the language.

[@glzr_io]

Think it's misleading that you mention that classes don't exist in JavaScript. In ES6 (released 3 years after this video), the `class` keyword can be used to declare classes in a way that's similar to classical OOP languages. Under the hood, it creates objects that are basically the same as the ones in the video, but it's a much nicer syntax. It'd be rare to see "classes" created in the 2 ways described in this video in modern JavaScript/TypeScript applications.

[@ronelperez2565]

very informative and good explanation! always a fan of your channel.