JavaScript the Hard Parts: Closure, Scope & Execution Context

Watch Will, Codesmith's CEO, delve into one of the most powerful concepts in programming: Closures. Here's what you'll learn:
- How closure works under the hood
- Core JS runtime features - execution context, JavaScript execution model and the variable environment
- How to able to wield, optimize and debug popular pro utility functions like once and memoize
- How to be able to implement the module pattern - one of the cleanest and most resilient design patterns in JavaScript
To test your understanding of these concepts and find more videos, challenges, and solutions you can make a free account on CSX - csx.codesmith.io/
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[@selinovaldes]

The best explanation of Closures I have ever heard… hands down. Sure, a 10 second definition would be faster but Will has learned how to make it stick in a student's head by making us do the work. 👏

[@liammahoney1748]

This guy is really a special type of teacher

[@SwimInAPondInTheRain]

I admire how much care he puts into stepping through each function, line by line, and by hand. It didn't occur to me how many coding lectures/tutorials did not do this

[@neilzedd8777]

Same! So much so I just ordered a medium sized whiteboard on Amazon basics. I never realized how much of a difference learning things the "hard way" makes - writing each line of code and going through it line by line, as well as a healthy mental model to represent the concept etc.

[@kewner8556]

So good. Not just a great explanation, but also told in an inspiring way. If only there was a whole web development course from Will! Just in case it's useful to anybody: 0:00 Returning a function from a function 15:04 Calling a function from inside the scope it was defined in 20:14 Calling a function from outside the scope it was defined in 42:03 Backpack/persistent lexical scope reference/closed over variable environment/closure 45:46 Returning a function more than once 51:41 Lexically scoped languages vs. dynamically scoped languages 52:11 The power of closure

[@Codesmith]

Super helpful thank you 🙏

[@youngkim3625]

I've gotta say, Will Sentance is captivating and genuinely inspires curiosity. His passion really comes through when he teaches. Thank you so much for this video.

[@petroszavrakas1109]

The ability of breaking down such a complex JS topics in small and simple steps and make them so easy to understand, its a charisma! Well done! Its the first time i watch an explanation of closures and i feel confident i 100% get it!

[@Codesmith]

Thank you Petros! More videos soon

[@samuelokoli6584]

All the love from Nigeria...I have never been so happy to attend classes...this was superb

[@mahmoudhussein947]

at last I can say that I fully understand closures , I really admire methodology of teaching and breaking down this complex topic 👏

[@Codesmith]

Thank you Mahmoud! Let us know other topics you want to hear about

[@douglasrogers1601]

Wow, outstanding. Thank you. Closure = Persistent Lexical Scope Reference PLSR = Closed Over Variable Envionment COVE = 'Backpack'

[@sideshowlol]

I absolutely loved this step-by-step walkthrough. Thanks Codesmith and thank you, Will. Also, as I happened to be watching on a Sunday, I had a good laugh when Will asked, "Why on earth are we doing this on a Sunday?" :D

[@Codesmith]

I love that!

[@ankitvasita]

I have watched tones of videos to understand hard parts of javascript but the way you explained these concepts is something that just clicks in my mind. Your teaching is on another level. keep it up.

[@Codesmith]

Thanks Ankit - hopefully we'll do some more courses soon

[@kylelambert9576]

Your videos have taken my JavaScript and programming knowledge to a whole new level. This is hands down the best explanation of advanced JavaScript topics. I can't thank you enough! :)

[@poppyseeded3062]

This video is gold! I was able to get through multiple closure problems after only watching a portion of the video!!

[@sezif3157]

OMG this is an excellent class on javascript and an excellent class on how to teach correctly, both simultaneously. Awesome, thanks Will!

[@cannabisanomaly]

I like to think this specific class that is involved with all of Will's lectures at this point in time is very similar to the class of students that was in the movie Dead Poets Society

[@headphonejames]

This was a phenomenal lecture and a top notch teacher. Extremely grateful that this is shared.

[@Codesmith]

We are so glad it was helpful!!

[@TibbyProductions]

Man, that backpack of data analogy is super helpful for understanding how closures work, thank you so much Will!

[@Codesmith]

Thank you! Spread the word 😂

[@salamander5969]

What the f , the way you explain it using diagram makes me understand it better, and you explained the best context

[@Codesmith]

Thank you! Keep going with the workshops

[@nguyennguyen-dd8kz]

Your drawing helps explaining closure in a clearer way! Thank you so much!

[@Codesmith]

We're so glad :D

[@oanacristea2572]

One of the most complex js concepts explained so well. Thanks Will and Codesmith!!

[@felipemelendez5741]

Best closure explanation I have seen thus far; excellent, thanks!

[@brucesmith1754]

Defining closures by way of understanding the background engineering. i really appreciate this approach to explaining these challenging concepts. Great job Will.

[@emate8422]

Ive watched multiple video about clouseres and yours explenection is Great Thanks

[@codellyson]

The best javascript teacher out there. Much love and thanks for all you do.

[@__prod1gy__793]

Will is great,i like his workshops on frontend masters

[@vusimdudu9033]

Wow, that is the best explanation of closure I have ever heard, well done Sir.

[@saidshahahmadi6975]

The best explanation of Closures, thanks smith

[@Codesmith]

Of course! Happy to hear it was helpful!

[@psk177]

You are an absolute LEGEND! Thank you so much Sir!

[@lalosalamanca1208]

Wow. This is insanely helpful. Thank you so much for going into depth on this hard-to-comprehend subject within the "scope" of JS.

[@Codesmith]

😂 nice

[@RocknRollDina]

Will is the best teacher ever!

[@offday3523]

so glad I found this! thank you Will!

[@Codesmith]

Glad you enjoyed it!

[@macmaster9887]

This is gem.. whole heartedly thankyou to codesmith.

[@ElvenIvy07]

I love this! 🙌🏽🙌🏽🙌🏽

[@gsmsalihou4505]

Very well thank Will

[@sanjusaju4049]

The best explanation i have ever heard!!....

[@markpowell8325]

This is crazy good. By far the best tutorial I have ever seen.

[@Codesmith]

We are so happy to hear it was helpful!

[@S0m0neRand0m]

Man, so happy I found this channel! You guys are all great, but especially you mister Will. Love the style, and I've always like the 'English accent' better than the American English 😉

[@Codesmith]

Thanks Stijn - I can't deny I'm a fan of American accents above all else

[@mattisnumber6]

This is awesome. Great educator

[@veggievera]

Wow! This really cleared things up for me :)

[@Codesmith]

I'm so glad!

[@trunks7012]

only time i can ever remember wanting to like a video twice

[@Codesmith]

haha - thanks so much 🙏

[@jiazhengguo5493]

awesome!!!

[@dhoomketu731]

Will, I owe you a beer. Great stuff mate.

[@professoroflogic8788]

We need the posh parts of JavaScript.

[@failureffect]

So I'm slowly understanding a call back can access variables within its outer function. But what are some real-world uses of a closure in React/Angular/Vue?

[@nickfan7867]

Life saver!

[@user-XM6756]

Talanted teacher!

[@daizowatanabe5818]

How can I access the value of counter, say like, to console.log?

[@thomasnielsen7466]

what did the JS dev team actually call the closure when they made it?

[@northstarcode8675]

When I first heard about "memoize", I thought it's a "memorize" in a Boston accent xD

[@hqbop9058]

Hi! I'm a student. I would appreciate it if you could help me with my homework. Thank u!