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JavaScript Basics: Object.preventExtensions and Object.isExtensible by ghasemkiani

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· @ghasemkiani ·
$7.64
JavaScript Basics: Object.preventExtensions and Object.isExtensible
In JavaScript, an object is extensible by default. This means that new properties can be added to the object. In some circumstances, you my want to prevent extensions to the object. To this end, you can use `Object.preventExtensions`. This function prevents any extensions to the object, so that no new property can be added to the object. If you try to add new properties to the object, it will cause a `TypeError` (or fail silently if not in strict mode).

Here is an example:

```
	let myObj = {
		name: "Ali",
	};
	Object.isExtensible(myObj); // true
	Object.preventExtensions(myObj);
	Object.isExtensible(myObj); // false
	myObj.age = 19; // fails silently
	myObj.age; // undefined
```

It should be noted that after making an object inextensible, its `__proto__` property becomes immutable. In other words, you cannot assign a new value to the `__proto__` property. However, if the prototype is extensible, you can add new properties to the prototype.

As the EcmaScript standard attempts to organize the global objects, this functions are also available on the `Reflect` global object. So you can use `Reflect.isExtensible` and `Reflect.preventExtensions` instead.

---

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@aliakbar2 ·
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Information is useful
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@alimuddin ·
very well post dear @ghasemkiani 
i love your post,, thanks for sharing
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@angela.ghkh ·
$0.16
interesting article ,, EcmaScript  ! I didn't know about EcmaScript  before ! can u please tell us to know what’s the difference between JavaScript and ECMAScript?? I mean in another post...actually if u have time ... regards !
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@ghasemkiani ·
$0.09
Thank you. There is no difference. ECMAScript is the  name of [the ECMA-262 standard](ECMA-262) for the JavaScript language.
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@angela.ghkh ·
$0.05
really ! thanks for the info
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@arfaturrahman ·
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For a long time I wanted to learn JavaScript. But the schedule of the office and training was not the same at the same time. Your posts have a lot of work for me. Thanks @ghasemkiani for sharing the wonderful posts.
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@asgharali ·
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Bisyar khub...
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@azizurrahman ·
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Upvote done mr: @ghasemkiani
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@charliechain ·
Good knowledge about basic of javascript full information ..keep it sir
Thank you very much.
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@cheema1 ·
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Your work is really commendable. Have a good day:)
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@fajabox ·
nice programing that is bless of technology
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@haji ·
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nice post
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@imran498 ·
Amazing information regarding  java script. Thanks for sharing nice post. Stay blessed
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@jimma2 ·
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@kazmi1 ·
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@mdmunna ·
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love to read it... thanks for sharing
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@mdnehad83 ·
Thanks for nice post
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@mdnehad83 ·
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@mohammadsaleh ·
$0.13
Great information abaout javascript....thanka for sharing..keep it up
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@mdmunna ·
so informative post for me.  thanks for your post.
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@nayim533 ·
$0.07
Javascript is onviously one of the best languages ever invented in computer world..like it
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@penking ·
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Javascript is onviously one of the best languages ever invented in computer world.
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@rasel1234 ·
very well post,,, Really you are giving a good post
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@razibahmed ·
you create a great post....i impressed to see it...Lot of thanks for Sharing this informative and valuable post....best of luck brother....
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@resteemhorizon ·
I appreciate your efforts to make techno post, thanks :)
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@robber7 ·
finally seen who working on javascript on steemit... good
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@saddam1210 ·
$0.07
thanx  for sharing
πŸ‘  
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@sam1210 ·
$0.07
Now a days i am looking for this type of post. Thank you sir.
πŸ‘  
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@steemitservice ·
useful information bro. have a nice day
πŸ‘  
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@syedkashifhussai ·
$0.07
Its great information JavaScript very good calculate but very difficult to understand . But nice lacture sir @ghasemkianiΒ and thanks for sharing with us.
Stay blessed.
Steem on!
πŸ‘  ,
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@talking2rolly ·
$0.07
This really require more tutorial because we are in the era of technology
πŸ‘  
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@timuann ·
javascript is a great technology in the mordern science.its basic part of  one of them.i think that, its  matter know should be all people.i read your post always attentively.because,new thing to know matter your basic post  doing help me.thank you very much for your learning  and helpful post sir..@ghasemkiani..
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