For loop, let i and setTimeout - how exactly does it work? | Javascript In depth, from spec

[@AAfzal5]

I can confidently say that we can not find a better explanation for this particular problem than this one, This channel is a hidden gem ❤️👏

[@lissetheflorramirezoyola6573]

I'm so grateful, it's the best explanation.

[@teabreak_]

Mark my words, There can never be a better explanation than this

[@gogulnithin4742]

I feel so special that i found this example.... really another level explaination😮

[@vivekbhatt3932]

This content is gold ❣

[@rohithchittibommala2002]

It would be appreciated if you could please start a series of JavaScript interview questions 🙂🙂🙂🙂

[@bendtherules0]

Hi Rohith, that's a interesting idea. Some of the things/internals (in this videos) are too detailed and not directly suitable for a interview. But it makes sense to also list down and answer a lot of the common interview-level Javascript questions.

[@rohithchittibommala2002]

@@bendtherules0 can we expect a series in future?

[@bendtherules0]

@@rohithchittibommala2002 No promises, but I'll try to do something like that later. Do you think video format works better for interview questions or text? Do you like the format that @Akshay saini uses in his youtube channel?

[@rohithchittibommala2002]

@@bendtherules0 yes sir It will be helpful for many freshers

[@zulfikarahmad3684]

Best explanation!!! Even i bad at english, i can understand this.

[@mitrasu5918]

This is like the most beautify Indian guy I've seen, he's straight out of Pixar movie

[@taofeeqomotolani2311]

Perfect breakdown ❤

[@exe.m1dn1ght]

omg sir i never knew how complicated is this !!

[@JavaScriptWithSohail]

Nice & unique explanation! Keep up the good work!

[@waynewatson7970]

thanks

[@ordaniel7699]

Thank you for this clarification, needed it a lot now that I'm preparing to my Front End position interview.

[@narayanareddy15]

Such a Beautiful explanation! 💗 Looking for these kind of breaking down videos 😊

[@ayushijindal3899]

you are amazing well explained keep making such videos

[@itsjmmariano]

This is great. Thanks!

[@jayjani740]

2 questions. Is the new iteration scope(i.e. scope1, scope2, ...) child of the overall scope in for+let? It it is so, then how does let allow redeclaration in child scope?

[@bendtherules0]

Yes they are child scopes of overall. Let allows redeclaration in nested scopes, like { let a = 1 { let a = 2 console.log(a) } } (the above code is valid)

[@jayjani740]

@@bendtherules0 Thanks Abhas, This cleared my doubt about redeclaring let variables in nested scope as well. No doubt, you gave the best explanation in your video. 👌

[@bendtherules0]

Glad you liked it 😀

[@NICHLE.]

Redeclaration in child scope is allowed regardless of var or let, because it is just a new scope, so in the end they will be treated as different variables. Btw this concept is called shadowing since the same named varible from the outer scope will not be considered in the inner scope, but inner scope's own variable will be considered.

[@dhwajsharma]

Continue making videos sir ❤️

[@dungam9402]

how do I clearTimeout and stop from setTimeout before it happens

[@bendtherules0]

setTimeout returns a id (number) which you can pass to clearTimeout. (Is that what you meant?)

[@dungam9402]

@@bendtherules0 yes that's what I mean. But My case is more complicated. My setTimeout() has run in for loop in another request. And I need to stop that's before it happens in another request. How can I get the id of a specific setTimeout() ?

[@bendtherules0]

@@dungam9402 You can't get the id later. Sounds like you need to use a closure / private variable with your callback function, so that it store the id while calling setTimeout. On next call, it can first clear the prev timer id and then do stuff. Ex - let id = undefined; function cb() { if (id) clearTimeout(id) ; id = setTimeout(...) }

[@dungam9402]

@@bendtherules0 Thanks My problem is solved

[@surajshetke4440]

This is a really deep explanation of let . I am new to JavaScript i never know this concept If didn't watch this video. 💯👍

[@MySachincool]

Great Stuff abhas :) Kudos!!

[@Me-og5iy]

Loved this!!!!

[@mahmoudmohamed-xu2lb]

thanks for that video bro

[@miw879]

I don't understand why is everybody here appreciating you I just want my 10 mins of wasted time back what the heck man where did you even explain how come var for floop gets the highest value when used in setTimeout.

[@bendtherules0]

Hey, sorry for wasting your time. I didn't want to separately explain why for+var prints 10 since i thought that is rather well known. But still if you listened to the var section - i mentioned that a single variable gets modified in all the iterations and since setTimeout runs after all the iterations, it gets the final value. In my defense (😀), the video title says how for+let works and that's what i mostly focused on.

[@miw879]

@@bendtherules0 I watched Akshay saini's video and understood now let is block scoped for every iteration a new the index gets a new value for call back function whereas for var it for every callback function it keeps refering to that initial single object and which after 1 second is one more than limit , and since they keep going to a callback function they execute one by one....

[@miw879]

@@bendtherules0 no worries man and sorry if I was rude

[@simple8810]

exactly I agree with u

[@VishnuV-tl9gd]

Even I felt the same, not sure whos mistake is this. Is he not explaining well or are we not able to get what he is explaining. Wish you have copied the link of Akshay saini's relevant video.

[@bryanhernandez6082]

Hi! I need to understand this topic but I don't speak English enough. There are some video about this topic in spanish or subtitled to spanish? D:

[@pankajpanday6351]

did for loop created a new scope for each iteration when used with 'var' but due to hoisting the variable was available outside??......OR was that the thing that for loop did not created the new scope for each iteration at all when used with 'var' ??

[@bendtherules0]

Yes, the second one. It doesn't create those scopes for var. Also anyway, the difference is not really visible - effect will be same if any of these is done.

[@niranjangowda9264]

thankyou so much

[@janakiramanss6214]

incrementing index value in the next iteration is the default behaviour for FOR loop or when it combines with LET it will work like this?

[@bendtherules0]

No, incrementing index value is not a inbuilt behavior - but typically we write index++ in last part of for loop which will increment it. We can also decrement it or write any expression. For loop only needs to evaluate that "post expression" (or whatever we call it) in every loop - for+let calls it in the start of next iteration (new scope) rather than at end of current iteration (current scope)

[@MichaelSartore]

Thanks very much for this excellent description of how this works. "LET" there be light! 😜

[@VikasSharma-zg2sl]

Thanku so much for making it so simple.. :) "Subscribed" for looking forward to leaning tricky concept like this from u..

[@vaibhavgodase9733]

Thanks

[@siddhartharajputsingh]

Suscribe bro... You are just amazing coder

[@binayakghosh3770]

bendtherules or learntherules ? 👻 Jokes apart, very nice explanation.

[@bendtherules0]

Haha 😂