Step by step understanding JavaScript IIFE ( Immediately invoked function expression)

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In this video we will try to understand why we need JavaScript IIFE ( Immediately invoked function expression).

[@dnfvideo]

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[@Teaktrades]

this is the best explanation on both youtube and the internet about this concept. thanks so much for sharing this knowledge.

[@srinivasaraoyp3640]

Very interesting topic in javascript. Thank you.

[@farooqawan693]

Thank you for your teachings and advises.

[@albertofabbri1543]

Very clear video, thanks.

[@gagangupta1255]

Very well explained - with real example.

[@blastingsound22]

I did not understand what polluting the global meant . Now i do ! Thank you

[@shakib_04]

quality video and explanation

[@uche8961]

I used to wonder what polluting the global variable actually meant, now i understand. Thanks

[@HashtagObi]

thank you!!

[@mdrohimsikder7669]

nice and thanks

[@bhuvanatn]

GOOD One

[@dylanm7638]

thanks

[@jaydeepkasture8483]

after you wrap the global variable into the anonymous function is it still the global variable?

[@amitsunnysingh]

I can happily say that no one knows the advantage of IIFE functions, just making stories

[@balus143]

Hi Shiv, So can't we use anymore iffy variables as a global variables ...? since we are unable to access the global variable (I.e. counter) inside of the function, then any ways to access a variable inside of the iffy block..?
thanks
Satya

[@dnfvideo]

Hello Satya sir,
The variables created inside IIFY will not be public he can still access public variables.

[@umeshchauhan3223]

Hi Satya, the counter variable inside IIFE can be used via a public return function which can be defined in IIFE and it should return the counter variable. This is possible because of closure.

[@stevedoetsch]

But doesn't the IIFE just get dumped from memory immediately after execution? So what good is it in this example?

[@shatakhian]

Instead of this complicated code we can just rename top "counter" variable to topCounter for example. It will be much simplier then IIFE.

[@questpondvideos]

In projects of huge magnitude the components ( functions) are created by some on else and page by some one else. You never know with lot of global variables you are sitting on a ticking bomb.

[@HimalayaGarg]

It is no more a global variable. Something wrong?

[@atulmishra8753]

if you are using counter variable inside SomeFun() , then automatically then outer counter variable becomes irrelevant since the function will use its own counter variable so I am not sure if your example justify IIFE

[@umeshchauhan3223]

The outer counter variable does not become irrelevant because without the IIFE, counter variable will be a global variable and all the other functions will use it as it is defined in global scope.

[@RamSharma-yl6ur]

@@umeshchauhan3223
var counter = 10;
function oldFunction(){
var counter = 50;
console.log('counter inside oldFunction', counter);
}
oldFunction();
console.log('counter outside oldFunction', counter);
This video no longer make any sense and has not described IIFE. To read about IIFE visit benalman.com/news/2010/11/immediately-invoked-function-expression/

[@RamSharma-yl6ur]

This video no longer make any sense and has not described IIFE.
var counter = 10;
function oldFunction(){
var counter = 50;
console.log('counter inside oldFunction', counter);
// Prints 50
}
oldFunction();
// Prints 10
console.log('counter outside oldFunction', counter);
To read about IIFE visit benalman.com/news/2010/11/immediately-invoked-function-expression/