The Scope Chain, 🔥Scope & Lexical Environment | Namaste JavaScript Ep. 7

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Not even a paid course comes close to the quality and content of these videos ...looking forward for future videos

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That's true 👍🏻

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Summary : 1. Scope of a variable is directly dependent on the lexical environment. 2. Whenever an execution context is created, a lexical environment is created. Lexical environment is the local memory along with the lexical environment of its parent. Lexical as a term means in hierarchy or in sequence. 3. Having the reference of parent's lexical environment means, the child or the local function can access all the variables and functions defined in the memory space of its lexical parent. 4. The JS engine first searches for a variable in the current local memory space, if its not found here it searches for the variable in the lexical environment of its parent, and if its still not found, then it searches that variable in the subsequent lexical environments, and the sequence goes on until the variable is found in some lexical environment or the lexical environment becomes NULL. 5. The mechanism of searching variables in the subsequent lexical environments is known as Scope Chain. If a variable is not found anywhere, then we say that the variable is not present in the scope chain.

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Thanks 🙏

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brilliant

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good work!

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me too!!!

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me too

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It changes so much when the teacher is eager to speak about the topic and he smiles :) Thanks for that! Namaste

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too true.

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Next Video: let & const Hoisting and Temporal Dead Zone 🔥 - kzbin.info/www/bejne/eH-mZ6aijqida5I How was this video? Are you feeling excited? Let me know in the comments below. ❤️

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First of all thank you Akshay for such a good explanation of javascript. Many doubts clear after seeing your video. Can you please make a video on coercion in javascript. Regards, Krishan

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Love you, brother!

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x2

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Saini is a good teacher. Though I think you need to read You Don't Know Javascript Yet Book Series by Kyle Simpson, then your head it'll get boom

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I am binge watching this "Namaste JavaScript" series.

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same

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This PlayList is my new Web Series... Looping over this again and again and again..... But in Every Iteration I'll something New.... You are Amazing Man!!!❤

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You are making content that one can only find in books and even reading that will make no sense to most of us. Thanks a lot for creating videos like this ❤️

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Thank you for your beautiful words, Anmol. ♥️ Feels like the effort is worth it, highly motivated. 😇🔥

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It's 12:03 AM right now as I'm watching this video. To be honest, I really enjoy watching you explain the concepts. The energy and enthusiasm are truly contagious. I just watched a long boring video on this topic and was ready to hit the bed, but your video keeps me awake to learn more.

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Brilliant Man, your way of teaching and expressions show how passionate you are for programming.

[@AlysonLeonard-o9c]

what i love about this videos is that you really hammer in the terminology along with the concept. So many other people only define the concept once, rarely repeat the core terminology, and then ramble on about minuscule stuff. You said local scope, lexical environment, scope chain, and execution context like 1000 times... and now I will actually remember those words mean, thank you!!

[@finjection]

I have been following you since you started your youtube journey. You are so relatable. I could see you were a little camera shy, learning how to interact with it,somehow trying to give content not readily available at other places. You changed my perception of looking at interviews, and seeing these videos now I feel you have evolved so much and I love the background music at the end. It brings a smile on my face and everything I just said flashes in my mind for a sec.

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True, the journey was amazing! And thank you so much for being a part of it along with me. ♥️

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I have not seen anybody explain Javascript with this much clarity and fun! These tricky concepts seem so easy now. That procrastination to take courses and learn things is not there anymore. I look forward to the next videos and have even started binging on to them. Thanks a lot for making this series. I love these quirks of JS now!!!

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I've been bashing my head against my desk so confused by scope and your 20 minute video cleared it all up and more. Top notch teaching.

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After start watching this playlist my love with JS is increased by 1000000000x . I have no words to express how grateful I am . (thanks a lot )*10000000000000

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I don't think I will ever forget what a 'lexical environment' is after watching this video. Some value bombs you are putting out man !

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[@paritoshdadhich2954]

Hats off to your enthusiasm for making such deep knowledgeable content toward understanding JS more deeply. I understood all the concepts which you covered in this video like scope, Lexical environment, scope chain. Lexical environment path of the example which you covered in your amazing video. c() -> local memory of c + lexical environment of a() a() -> local memory of a + lexical environment of GEC GEC -> local memory of GEC + it's parent i.e. null Again thank you Akshay sir :)

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♥️✌🏼🔥

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Bhai bhai, no words to describe this series. I was just writing JS code for the past year, and now I understand why and how it works. Thanks a lot for clearing the basics..

[@abhishekvishwakarma9045]

I got it -> scope chain is somewhat like DFS algorithm the difference is in SCOPE chain -> it is going to find the variable till it reaches the last parent lexical environment (if found in some parent's lexical then return from there) and in DFS it deep down from branch to branch (till child) until the element is found. Thank you for teaching multiple concepts😁😁🔥🔥👌

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working in software industry for more than half decade, Now I understand what is lexical environment and scope chain and how it works, thank you Akshay, helps a lot

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This course should be a paid one. The content is awesome, easy, and clear. This is kind of as addictive as "FRIENDS" :-)

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Thank you Disha, it means a lot. ❤️

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Why you gave him this (paid) bullshit idea 😢

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I am just amazed how much this guy enjoys teaching, your videos never feel boring and i really enjoy learning along with you❤

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The Lexical Chain looks like a node added in the front of a linked list, each time an Execution Context is created 👌👌Nice. I am enjoying this JS series

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To be very honest this is the only one channel who teaches JavaScript in such an easy way. I can't say how much I love your js series. Cristal clear explanation.Please make other videos on js topics and react js 🙏🙏🙏

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I thought I'll honestly never get these keywords, so much in depth and so beautifully explained, and most importantly everything begins from execution context. I mean I am actually repeating after you while watching the videos. I wanted to learn JavaScript for some job purpose, but after this video. I can completely say, I love it. I want to learn as much and I'm blessed I came across this wonderful series. Thankyou so much Sir 😍

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when you say please let us revise shows that how much you want to contribute to a community and u want everyone to learn JavaScript hats off to you man

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Me in class: mam please explain it again please Akshay : please understad I I'll tell you again

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😅♥️

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Liked before starting with learning. Fallin in JS Love

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This guy understand very very very deeply what he teaches.

[@0xFOXHOUND]

For revision Scope: where you can access the value of our function in our code Lexical environment : the Local memory(Created and goes hand-in-hand with 1st phase of corresponding execution context ) along with Lexical environment with the parent! and every time the lexical environment of the corresponding context is used, it references to its parent Lexical environment for simply understanding, I will try it as 'an onion example' see when one layer of onion(a variable) covers the layer inside it, it also covers the inner layers inside that layer and a point on our first layer of onion encloses inner layers our inner layer(variable and function inside the layer) gets covered by our first layer(can access the variable on the context) and the second layer(under first layer) encloses the third layer(innermost layer)still covered by 1st layer(can access the variable on layer) the Clojure concept starts here

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TQ for the revised content

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This guys is really teaching like a teacher who takes 5 min extra to explain the important concept. Love you Bro

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Great video as usual. Whenever I see your video first I click like button and watch it.

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♥️

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Same

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same here and it's worth more than that

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youtube is blessed to have youtuber like akshay saini, aditya verma who are having awesome content keep the good work up guys

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Akshay, you are a blessing man. An amazing, passionate mentor (not just teacher). Ps. where did you learn all these details?

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Checkout the latest Diwali Special QnA video. 😇

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I felt like i had bought a premium course on javascript.

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Call stack is beautiful ❤️, that intense explanation with full energy, really loved it 🔥 Akshay: how is the Josh? Me : HIGH SIR❤️

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🔥

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kids: that girl is beautiful bruh. akshay: call stack is beautiful! :>

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heheh :D

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Function is beautiful :)

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javascript is beautiful

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Explaining a concept is one level of skill. But showing how things run in the console is just exceptional. Never seen anything like it before. Glad I found this channel.

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This guy is **legend**. I started watching his Js Series, and it's *perfectly splendid*. This guy is sharing his knowledge for free, Hats off to him. You the Best

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I come here for JavaScript interview questions preparation and completely fell in love with JavaScript and watching all your videos here, that's how you are making the videos on JavaScript. Thanks a lot.

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Your enthusiasm and eagerness in making people understand the concept is amazing,I admire you for that. Thanks for helping us understand the concept

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First Ever Tutorial in which I never paused, He explains Really well Becoz he Knows it Very Well !!!

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Best course on the whole internet to learn fundamentals of JavaScript.

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Hours of reading and researching presented the best way possible. Much much appreciated Akshay.! Good Luck

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a perfect turorial for those who just learned js and are trying to learn advanced concepts of it

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After this episode i have more strong understanding for undefined and Not defined , can relate everything so easily now .......😎😎

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This entire series is extremely mind-blowing and it is helping me become a better JS developer. My only regret is that i didnt find it sooner. God Bless you sir

[@sanjeevshrivastava]

To be honest.. this is the most practical and best video to understand Lexical environment and scope chain. Better than many paid courses. Good job Akshay!!

[@hussainnaushad7]

I have watched so many videos. Akshay Sir, I say it from my heart, nobody, literally nobody, comes close to your teaching style. You are a magician. i can say i will never forget what you taught about scope, scope chain and lexical environment. Thank you so much!

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Mechanical se hu aise Tashi hui pdi h IT m aake Ab todha confidence aa rha h Thanks bhaiya 💜🙏

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Probably the best explanation of JS fundamentals! THANKS!

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Even the Creators of Javascript didnt have this much of Understanding about Javascript..........Akshay saini sir. you rock.!

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this is something that some one really want to teach from the heart.

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I am preparing for the interviews and I can't thank enough to Akshay Saini for this amazing playlist. Thank you so much, Akshay. Hope to crack the interview soon.

[@Moonwalkerrabhi]

Now I wont ever forget what's lexical env and scope chain, Thank you !

[@praveenkanwar953]

this is best series. Even a very confused person can learn

[@wthboms6]

i have never seen a better explanation of scoping/scope chain, thank you so much!

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Haha! I saw Akshay's videos a year back. Though my domain isn't web development anymore. I quickly wanted to revise them. And trust me when i say this it just took me 30 seconds to skim through this video and boom "NOW I KNOW WHAT THE CONCEPT IS"😂 Quality time spent on these videos in the past and now you just need to have a look. Everything is already stored in your brain. 😂

[@MrMohfeez]

Bro, wherever you are!!..may god bless you, i have never seen a person explaining in this detail to help others, i think your heart is made up with gold. You are so kind hearted person to put these concepts for free...this is best content i ever found in youtube regarding Javascript.

[@gochallenge6146]

Man..!!! This is the bestesttttt video on lexical scoping. Thanks a lot! God bless you.

[@iamsairash]

Thank you Akshay, What I learn in this video: Scope is where we can access any specific variable or function in our code. if there is some var b, where can I access the var b that is the scope of var b. When execution context is created Lexical Environment is also created. Lexical Environment is the local memory along with its parents' Lexical Environment. In every execution context, there's reference of parents' lexical environment. Basically, We get global execution context, and some functions in that global execution context and some more functions inside the functions. The inner functions can access variable of outer functions up to global execution context (hierarchical parent Lexical Environment). but the outer functions or global execution context can't access variables of insides functions.

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