Objects in depth in javascript in hindi | chai aur
HTML-код
- Опубликовано: 10 фев 2025
- Visit chaicode.com for all related materials, community help, source code etc.
#javascript #hindi
Sara code yaha milta h
github.com/hit...
Discord pe yaha paaye jaate h:
hitesh.ai/discord
Instagram pe yaha paaye jaate h:
/ hiteshchoudharyofficial
Thanks! Awesome way of explanation man. Damn
Sir bundle of thanks, yahan tk pohnch kar mujhe wakeyhi lag ra hey k ye course bohat keemti hey, is sey pehley me 2 bar JS ko doosrey mentors sey bhi kar chuka hun, ab third time aapse seekh raha hun, yahan aa kar mujhe aik bat ki zroor realization hui hey, wo ye k ab me ye dekhta hun k jis mentor sey me seekh raha hun, usey khud ko JS ka kitna pata hey, me sabhi mentor ki izzat karta hun, lakin in depth kabhi na kabhi student k dil esa phase zroor ata hey k wo critical way me sochney lagta hey, aik to aapkey teaching style bohat unique hey, or friendly hey, secondly aap apni tarf sey bharpoor try kartey hen k me jo bat samjha raha hun, wo student k dimagh me literally ghuss jaey.
14:51 undefined is bcz in greeting function we already had console.log('message') ...but while calling the function you used console.log(greeting()) again. due to to console.log() we are getting an undefined. Just write gretting() and there will be no undefined.
same goes for 17:05
We are getting undefined, because there is no return statement in greeting function , and when we explicitly don't return something then the function returns 'undefined' implicitly.
@1:13 objects intro
@7:20 object key using symbol datatype
@9:30 adv.
@11:00 freezer( ) method in object
@12:00 symbol snip again
The uniqueness of your course, you not only teach the topic but also learn the exact use of it.🥰
Iss lecture mein jo sir ne concepts bataaye hain woh sach mein in depth hain. Notes banaake aur ache se samajh aata hai. This series is lit.
sir the undefined value that is being printed on the screen is bcoz u r printing the return of the function which is not defined
console.log(JsUser.greeting()) is wrong instead use JsUser.greeting() for calling the function
thank you
finally found a great teacher on youtube , really really helpful
Loved the series till now .I am frontend developer and learning backend technology. I have been working along JS but still watching this playlist bcz its always having something new to learn .To everyone who is beginner Don't worry you are watching best JS series of internet .So keep rocking and keep pushing the boundries .
Grateful to you sir for you efforts .I am in love with this playlist and yt channel too .The way you teach does not let us bored and we are learning in fun way .I would say you are having the best extraordinary communication skill.LOve from Pakistan
### Correction @ 1.25
Object Literal: Naturally supports Singleton pattern by creating a single instance and providing global access through a closure. It’s a straightforward approach for ensuring only one instance.
Constructor: By default, allows the creation of multiple instances. To implement Singleton behavior with a constructor, additional logic is needed to ensure only one instance is created and managed.
Thus, while object literals inherently create a single instance, constructors require extra steps to achieve the same Singleton behavior
@15:15 hello sir,undefined is the return value of the function greeting( ).
Q k humne dar-asal value ko print karwaya hai na k return, to jab kuch b return nahi hoga... to by default undifined he return hoga.
just call the function don't use console.log e.g Jsuser.greeting()
Best and in depth tutorials, Hitesh sir "sikhana hai to investigation ke saath" ye sahi bat hai...
15:00 , you are using console.log(console.log()) thing thats why undefined coming, just like python when you do print(print("Hi")), it gives hi then none. print statement inside print statement.
i don't know if my logic is correct but i can think of this only right now.
Bilkul sahi he.
The full name has space in between and thus it cannot be acessed using . Notation but if there is no space and if we type the key in string expression like 'fullname' it can be accesed using . Notation
right bro
13:53
In your function, you did not explicitly return any value. Therefore, when you call the function within console.log(), it prints 'undefined' because that's the default return value for functions that don't have a return statement.
love you sir..ye Internet ki best series hai JS ki..Jitna aap deep explain kr rahe hain utna kisi ne ni kia hai Yt pr...very thanks Sir
hitesh sir be like raat 12:30 baje hai to best object tutorial to bana lu
in greeting & greetingTwo functions you log messages to the console but don't return anything, so they implicitly return undefined as an output after every console. But when we use return keyword in functions instead of console.log it will not output 'undefined'.
Why he didn't get it?
true, because whenever we are using { } we have to explicitly write return whereas when simply using ( ) we do do not need to write it
This is true I have edited the userDetails.greeting and the undefined is gone now. Thanks @sgsbakers. New code is =>
userDetails.greeting = function(){
return `Hello JS user, ${this["name"]}`;
14:50 I think we are printing a print function that's why we are getting undefined after output. as you can see the function at line number 31 we are printing something in function. So we don't need external print command to print line 31. we can simply execute function without console.log()
We are getting undefined, because there is no return statement in greeting function , and when we explicitly don't return something then the function returns 'undefined' implicitly.
7:02 the issue with the object property "first name" when trying to access it as (object.first name ) is because of space , if the property name was "first" then in that case it is easily accessible as object.first or object["first"] both will work . As any property name is coerced as string
Yes both should work.
@@KoushikBiswas-jo7iy yes both will work .
@14:51 "undefined" is appearing because the function is not returning anything, and you have called the function inside the console.
Exactly
yes you catched it bro
7:12
the error is because you have given space between "full name" if you write "fullname" or "full_name" then it is accessible using dot method also
Best JavaScript Video... Thank you sir❤
15:12
Console.log(jsUser.greeting()) answer ( undefined ) ❌
jsUser.greeting()
Answer ( "Hello js user") ✅
Undefined remove 😁
10:00
The syntax of declaring a symbol inside object still does not seem to be correct because upon
console.log(typeof JsUser[mySym]);
// It returns *string* , whereas ideally it should return Symbol as its dataType.
Same doubt, have you got any answer ?
@@hobabu7066 The Explaination was quite confusing.
However following code prints type of symbol:
// Objects
let mysymbol = Symbol('Key1');
let myobj = {
name: "Shaharyar Ansari",
id: 1232,
[mysymbol] : mysymbol
}
console.log(typeof myobj[mysymbol]);
The only reason for using Square brackets inside an object is to assign a dynamic key.
Forexample:
let key = 'dynamicKey';
let value = 'This is a dynamic value';
let obj = {
[key]: value
};
console.log(obj); // Output: { dynamicKey: 'This is a dynamic value' }
i think jaldbazi mei sir bhool gye
@@shaharyaransari4887 thanks man it woked
10:20 me jo sir , key ka syntax shi kiye hai taki uska type symbol aa jae. Lekin syntax shi krke firse check kiye to type string hi hai.
same problem
+1
The best JavaScript playlist available on the internet 🤗
@15:00 The reason you see undefined is because the greeting() method in this code doesn't return any value explicitly. In JavaScript, when a function doesn't have a return statement, it implicitly returns undefined.
undefined is bcz in greeting function we already had console.log('message') ...but while calling the function you used console.log(greeting()) again. due to to console.log() we are getting an undefined. Just write gretting() and there will be no undefined.
The reason of undefined is because the greeting function is not returning anything it is just priniting thats why the return type is undefined
*Sir really React complete karney kay baad dekh raha ho concepts ko clear karney kai liyay ab samjh araha hai in depth course ka matlab😃*
same bhai react course complete kia hay or ab ye dekhna start kia or boht maza aaraha
Kha se kiya react course?? Aur bina js ke smjh aa jayega react?? Mai bhi soch rhi react shuru krne ka
@@Scarlett_firz js basic ani chahiyay and react ka course chai or code sai hi kia best hai all over youtube
kya baat hn sir, what an explanation!..
Mene bahut video's dekhi par maja nahi aya apki video dekhta hu to sach me apke video's achhe lagte he aur helpfull he thank you
maa kasam maja aa gya ek number explaine 😃
singleton: jab *constructor* banega tab, na ki jab *literals* banenge tab
7:07 to access values inside objects: eg. JsUser.email or JsUser["email"]
Haa bhai wahi i think glti se galt boldiya
00:05 Objects are an important concept in JavaScript
02:00 The approach is to create an object and assign values to it.
03:54 You can access object values in JavaScript using dot notation or square brackets.
05:51 Understand the output of printing values
07:53 To declare a symbol and add it to the keys of an object, use square brackets
10:10 Syntax error caused rejection in interview
12:08 Understanding symbols and keys in Python
14:11 Creating a greeting function and understanding object freezing
16:12 Introduction to objects and their properties
17:56 Mastering scripts enables successful interviews
Crafted by Merlin AI.
18 ki age me etni kamyabi achieve kr li are i am very proud of you engineer sir
15:00 --> We don't have to use the print statement console.log(JSUser.greeting()) because it will print and then return "undefined". Actually, the function itself is already printing the greeting, so we just need to call it instead of printing it again.
in my case also there is 12:29 am haha,,, you are doing great sir, I eagerly await the backend series.
Kya din, kya raat. Agr mza aa rha to kaam krenge hi
sir the best thing is that we never get bored by your videos,, main ny bht sary courses starrt kiye is sy phly but end kbhi nahi hua koi bhi , but jb sy apka js course dekhna start kiya hai aj 35th video hai within one week,almost 4-6 hours+ daily screen k samny gzr jaty hain time ka pta nahi chlta ,smj b aa jati or practice b ho jati@@chaiaurcode
Thank you sir ji main thoda research kiya ki RUclips pr available js ki jyadatar playlisto pr really sir ji sabse alak hai aapki playlist concept ko apne alak hi tarike se bataya hai bahut bahut dhanyavad sir ji
When u call the function directly instead of console.log - "undefined" doesn''t show on the console.
This is literally The best javascript playlist on RUclips.
Hope the way you guide the students will truly bring a revolution.
Lots of love Sir😍❤❤
For those wondering about undefined . Its is comming beacuse the function is called in console.log and function it self is not returning anything .
Buhat achy sy apny explain kra Hai,🥰
"Chai aur Code, you've successfully turned me into a JavaScript enthusiast. Your tutorials are gold!"
@7:02 you can also access by dot method
let a={ "name":"ahmed",
'age':20}
console.log(a.name) // ahmed
console.log(a[name]) // ahmed
conclusion:
if you give "key" in string or without string it wiill access by both two methods
omg i've seen such a high quality oontent like this on yt , i'm just getting jealous that many people can have access to this video and they'll be getting more info....damnn bro,this playlist is lit
Best video on internet
Shandar lecture
Keep making such an amazing video lecture for us
These lectures are very helpful for us
his eyes have that dark thing around them indicating the tiredness. BTW I am loving your videos and I am actually a 9th grade student and am able to understand almost everything. This course is better than any other course I've seen on YT. Thank You Sir.
Thankyou for theamazing video sir but at 17:05 ,the output undefined occurrs bcoz in the line no 38 you used console.log to print a function(jsuser.greeting()), function directly excute when it called just by jsuser.greeting(),why we need to write console.log(jsuser.greeting()). i guess you miss that part sir.
@10:09 the methode that you told still shoing that in string even i dicleared it correct way .
same problem
sir you use console.log on jsUser.greeting function i.e. it takes undefined when you use console.log in replace with when use return then you dont get undefined is it correct or not plz explain
As of 2024 the part where sir wrote at 6:33 " fullname " : " hitesh choudhary " and while we were trying to access it using the dot method it wasn't accessing but now we can access it using the dot method.✅
undefined @15:10 is due to the fact that console.log print what is returned when so in this case when greeting is used nothing is returned so fun returns undefined which is printed.
I think Here is undefined is because one from greeting method, second thing from where in which console greeting method is called, means double console,(inside one console is sub console)
There are no words for your teaching skill and knowledge sir.
The best series on the internet !
really its the best sir ji
'undefined' is shown , because we call the method in console.log(jsUser.greeting()) and we console also in greeting method. It will removed if we directly call method without console. eg; jsUser.greeting()
I've been fortunate to have incredible guidance on my journey to becoming a full-stack programmer. Learning with the help of this amazing tutorial, I've been steadily mastering JavaScript, and it's been an enlightening experience. A big thank you to my learning companion for being there every step of the way.
hh
kkk
Hy Sir,
Hope you are fine
Amazing JS series
But some points you have to clear
jab ham objects ko perh rhe he or functions wala topic abhi start ni kia to ap object me function ki examples q de rhe he
jab eik beginar ko function ka pata hi ni syntax ka
to hame abhi just objects perhny chahiye after read function then hame is terha ki examples kerni chahiye
Thanks Sir
15:00 maybe it's becuz of the absence of return value
JsUser.greeting = function(){
return "Hello JS user";
}
JsUser.greetingTwo = function(){
return `Hello JS user, ${this.name}`;
}
console.log(JsUser.greeting());
console.log(JsUser.greetingTwo());
OR
function jsUser (name) {
console.log(`Hello JS user, ${name}`)
}
jsUser("Hitesh")
Hi there, in this lecture we are getting undefined because we are executing a function inside console.log();. By executing JsUser.greeting(); we are printing "Hello JS user". And the execution value of JsUser.greeting() = undefined. Which we are printing by console.log(JsUser.greeting());.
Waiting for a reply. Correct me if I am wrong. Love from Bangladesh 🇧🇩 .
Wow [ ] can take my job 😂😂 I better need to be ready for Interview Sir. It’s creating fear and confidence at the same time
Sir I think greeting function giving undefined because of we are printing this function so it expect some value
console.log("=======jsUser.greeting()====",jsUser.greeting());
console.log("=====jsUser.greetingTwo()======",jsUser.greetingTwo());
no doubt sir you are great teacher
Sir , JsUser.greeting(); should be used to call the function and print the value in it. as you console.log(JsUser.greeting()) & console.log(JsUser.greetingTwo()); it want function to return a value and give the answer , thus you get udefined in the browser ( Correct me if i am wrong )
Gold Js Content ON YT . keep Creating more content sir
@ 14.46 It gives undefined as we did not use return keyword there. If we use return it will not print undefined.
4 years of college ❌ Hitesh sir ✅💀☠️ love from Pune❤
@17:09 undefined in console becuase at line number 37 and 38 in console log greeting() and greetingTwo function are called a
which do not return anything explicitly and by default "undefined". is returned.
Two things, Primarily the undefined you were getting was because you were trying to print the output of the greeting function and since it returned nothing you got "UNDEFINED".
Secondly, when I am printing the typeof obj[symbol] its printing undefined. IDK if its supposed to be this way or not.
If anyone have time can you elaborate a lil.
for me obj[symbol] is printing string. Maybe you should check your code for any typo.
Sir on google and chatgpt it is telling "object created by object literal are singleton" but @ 1:27 u said constructor se singleton hota h sir idhr confuse hogya plz clear krdo🙏🙏
understood objects in js very well.....................................
sir woh undefined isiliye aaya kyu ki woh function kuch return nahi kar raha aur apne usee console.log() kara hai
when we create an object using constructor method we have to mention the object as a singleton otherwise it will behave similar to literal object and we can make multiple instances out of it
Bhai thoda smjha do plz
all the comments solve my residual doubts thank you guys
15:09 ye undefined line 34 se aa raha h qki at line 30, function greeting is not returning anything.
In symbol [10:36] even when we use square brackets than also the typeof is returning string. Can anybody explain me this
I've the same question.
const is used for constant which means their value can not be changed then in this how we change value of symbol at 10:25
We the use of const is that the reference to that symbol not the value stored in that symbol
Symbol is new to me 💯
Sir woh last mein undefined isliye araha hai kyuki function Console log kar raha hai na ki kuch return kar raha hai or an function ko console log mein print karwa rahe hai toh isliye undefined araha hai
the function was showing undefined because you logged a function which was not returning anything, how could you not get this simple thing
Very nice js Course ✔✔❤❤❤❤❤❤
@6:55 its giving access by full name by using dot
Objects key are always of string data type while value are of other types.
i will try to create objects ✅
This series is very addictive❤
FullName wala Jo double quotes mei declare Kiya tha , dot operator se bhi chl gya mera
Awesome 👍
Hello @Hitesh Sir, I think undefined in the last , is coming from console.log(). If we write JsUser.greeting() only then undefined will not show
information overloaded
THIS SERIES IS SO ADDICTIVE , MY GOD😍😌
SUMMARY :
Object name = {
keyname1: value,
keyname2: value
}
1. To declare object there is two method. Object literals and Object constructor(singleton).
2. To declare symbol in object use [ ] on keyname .
3.To freeze/lock an object = Object.freeze(object name).
4.To access object use objectname.keyname and it is called dot notation.
5. Use [key name] notation to access object key with special characters and it is called bracket notation.
"Excellent tutorial, covers JavaScript objects' depths neatly! Loved the chai tea and code puns. #JavaScript"
Note: This comment is written in Hindi script, which would look like - "पर excellant ट्यूटोरियल है, सक्षम JavaScript objects की depths निग्रानी करता है! Chai tea और code शब्दों से प्यार लगाया। #JavaScript"
Excellent Work Done bro
the reason of undefined kyu ki aap ne function me console kiya hai aur execute ke time per bhi aap console kar rhe hai ya to execute ke time console mat kijiye ha to function me se console ko hata ke return kardo
property type still string rhty as symbol use krna k bawjood. Symbol mn ku ni change hoty?
thank you sirr🙏🙏🙏🙏🙏🙏
10:31 Sir, to use Symbol as a key, what if we use Map data structure!?
sir is tutorial very help full for me jo me chz ki sekhe oski practise kasie kare for eg aj hum ne object seekh hai?
15:04 undefined aa raha because greeting() is not returning any value , use return keyword to avoid that
maira erroe aa raha hai jsuser.greeting si not a function
@@AnkitPandey-jo4ye you need to add ()