The first 1000 people to use the link will get a free trial of Skillshare Premium Membership: skl.sh/webdevsimplified12201

when you add an element into an array with an index greater than the length of the array, it adds empty elements before this. So when you execute a[100]=1, the array's length becomes 101

This is a perfect test to TEST how fast you can Google!

The array length is 101, it always picks the highest one and returns undefined for the uninitialized indices: > let a = [1, 2, 3] undefined > a[100]=100 100 > a.length 101 > a[88] undefined

Awesome video! The answer to the first one is "immediately". There was no HTTP request in the code. I think you may have overthought that one and took into account the way that the JavaScript is actually loaded into the interpreter via the browser.

Q:12's correct answer is 1. It is about closures. When a variable of a function does not exist, it will look for it at its outer lexical environment. In other words, variables wont be looked at the outer place where the function was invoked, but where it was declared. Using 'var' or 'let' will have no difference here, the result will be the same.

I took this test back in the spring and didn't get in the percentile needed to pass. I have used javascript on and off for years, but kind of just learned what I needed to know in order to complete whatever task I was working on. Last month I saw Kyle's javascript simplified course and decided to give it a shot. I took the linked in quiz again after completing the course and got top a 5% score. This is not any kind of paid endorsement :) but it is definitely a recommendation to consider the course if you need to strengthen your javascript skills.

It's great how relaxed you are in your videos. Also, amazing that you get straight to the point without talking about nonsense for minutes. Keep up the good work!

10:25 It would have redefined global var if we didn't use var keyword with it As var is scoped to function not global, f1 will log the global var v with value 1

Hi Kyle, I love your videos, and you're definitely smarter than me!. I rarely comment but feel a correction is in order as it's fundamental: Q12 (on var and v=1, v=2). The var inside f2 is not the same as the global var! (it would be only if var was absent). Scope is defined by the block so declaring (with var, or let for that matter) v inside function f2, makes it invisible outside of that function. The declaration inside f2 does not alter the global value of V. The reference to V in f1 can only see the globally-declared V and so the answer is 1 not 2. (I probably haven't explained it as well as you could but the results never lie, try it!). Thanks for your efforts and keep them up!

Hey man, I just wanted to thank you for making all of these awesome videos. I (computer science grad) started watching your css/html videos and have been following all your projects ever since. Keep up the great work!

The most intense video I watched on KZfaq. Congratulations Kyle!

You're an amazing teacher Kyle! Your videos are concise, straightforward, and fairly easy to understand even for a beginner like me. I'm only 14, but I'm trying to make the most of my quarantine so that's why I started coding since last year. Watching your videos helps me a lot when I get stuck on a project!

The array length was 101

In question 12 it will log 1. Since during compilation, the value if v inside f1 will reference the variable in either its outer or local lexical scopes. v2 has been declared inside a different lexical scope, thus it doesn't re-declare var in the global scope. In other words, the v variable declared in the outer scope becomes a closure of f1 anonymous function, and is going to carry this "backpack" wherever it gets called.

Q1. it will show immediately since it is loaded directly on call stack. the setTimeout is a macrotask so it will execute after call stack is free

I failed the JS test even though I use it daily and passed the C# and I hardly know C# and almost never use it. IMO those are some tricky questions that you will almost never run into and if you do you can google your way to the right solution to get the job done. Also, it is best not to try so hard to remember everything and develop a mind that can figure out how to solve problems instead of remembering everything someone else taught you.

I gave this test yesterday and got 5% but never thought you will give this test. Happy to see you there :)

Wow what an awesome helpful video! Thanks for posting. The suspense had me biting my nails lol

thanks men I really enjoyed this quiz with you hope you do it again and again !! I like it bro

Great stuff, I really enjoy and appreciate your content. Regarding Question 12 about what value will function f1 will log to console. I know reason of that but I got it wrong anyway as I rushed through when I tried to solve it along with you when I was watching video. The trick here is that var is function scoped, however it is also as important that scope of function is declared based on where function is declared, not where it is executed and here we have both function declared in global scope. For example if we have: var i = 1; function f1() { f2(); var i = 2; function f2() { console.log(i) } } f1(); then we would get three scopes: - global scope ( var i =1, function f1) - function f1 scope (var i =2, function f2) - function f2 scope () Now when execution of f2 happen, it check if there is variable declaration for i , if not it would look up in closest/nearest outerscope that is f1 scope. Here js parser would find variable declaration for i with value of 2 assigned so it would use that value in scope of function 2. I believe it is similiar but not exactly same as closure concept, that would worked differently, but correct me if I am wrong

This was very informative thanks glad to hear your thoughts on the test

First question is ‘immediately’ - the callback queue won’t run until the stack is empty.

Man! you're the best CSS dev & the smartest one.

Learned a lot. Please do take these type of assessments for Front-End as these will help newer devs like us to evolve. Cheers!

5% here too! But I answered some questions differently haha It'd be great if we could know which questions we got wrong :/ Thanks for the great content as usual :) You are an inspiration

Number 1 would run the code outside of setTimeout first even if you set 0ms as the argument, because it places the code inside the setTimeout function at the bottom of the execution stack. I liked this video, it shows that even people who know a lot don't know everything.

I took this test about a month ago and got top15%. You're good 😅

q1 - Immediately q4 is 101. Arrays are linear data structures. Which means data is arranged sequentially. So if there is an item at position 100, then index 0-99 must exist q12 - 1

I started learning JS in March and took this assessment last month. I did well, but I already have a better understanding of the language and can reason out my answers much better than I did at the time I took this. I had no idea what a generator function was (I've since watched your video on them) and I think I also got tripped up on the array question.

Love this! I did that quiz and got a top 5% of all the people that took this test! Very excited and curious to see what you get Kyle!

Holy shit I was exactly waiting for this one!!

void is for a function that returns no value. If you use return, it does not return a value - no errors, just no value is returned. It is basically a precautionary thing or a thing that you'd do for stuff that returns a value that you don't want returned.

Thanks. I really like your videos, I learned a lot from you.

Awesome, interesting ❤️ , waiting for next upload as this.

That was fun! very basic, I wish JavaScriptSkillzQuiz could be a hashtag online.😊 I learned something new from question 8; get methods must have went over my head in the spaghettis curriculum of TS/JS but sure looks very sugary! Makes the class paradigm worth using more honestly.

Actually really enjoyed this video, do another 👌

Keep these coming Kyle

Question 13, at least in the console you don't have to use let/const/var to create a function, but it will be a property of the window object. This doesn't work in ES6 modules though.

I was thinking Q12 @ 10:00 would print 1. f1 prints the global variable v, f2 defines a new variable v, which is function scope, and this is different from the v logged in the f1 function.

Im a beginner and this was helpful to me. I struggle with knowing how much I actually know. I got most right as well.

In question 12 the answer is 1 because of the second assignment of v is actually a new initial variable of the function 'f2', which means that it doesn't change the global 'v' variable..

I took this test last month and got top 5%. Damn! I am good!!😎

Happy to see I'm not the only one that was a bit stumped by the LinkedIn quiz. Much prefer real coding assessments like CodeSignal etc.

howdy. great work. the function would have logged 1. f1 closed over v global v, not the f2 local v. since f1 does not accept v as an input, f1 logs unchanged global v 1. var is still function scoped. let and const are block scoped, in addition, so they will need to be redeclared in loops, if statements, etc. if f2 said v = 2, f1 would log 2. this is an example of why shadowing can get confusing. you lose track of what scope the variable is in.

Q12) var v = 1; var f1 = function() { console.log(v); }; var f2 = function() { var v = 2; f1(); }; f2(); When the code is executed, the following happens: The variable v is declared in the global scope and assigned the value 1. The function f1 is defined, which logs the value of v to the console. Since v is not defined locally within f1, it references the global variable v. The function f2 is defined, which declares a new local variable v and assigns it the value 2. This local variable v shadows the global variable v within the scope of f2. Inside f2, the function f1 is invoked. When f1 is executed, it tries to log the value of v. Since v is not defined locally within f1, it looks for the variable in the outer scope, which is the global scope. Therefore, it accesses the value of the global variable v, which is 1. Therefore, the code will print 1 to the console. NOT 2.

3:54 1 is PHP, 2 is Haskell, 3 is Javascript

Kyle, thank you for this video. And in 13th question there are two correct answers: discountPrice = function(price){...} without 'var' will also create function just fine. Looks like a mistake in this quiz.

I got all of them right except 11. That was the first time I've heard of void in js.

4. Answer is 101 12. Answer is 1 because v === 2 only inside f2 it would have overwrite the "ouside" v without the var keyword 13. I agree with you, but answer number 2 could work as well (it is not a good practice to add variable to the gloabal object but this is not a crime either) 14. I'm not sure what the problem is expect the result is very predictable

I think the answer to the first question should be immediately. Timeout functions and other promise calls and what not will not be executed till the global thread of execution is done. Then only javascript will look for stuff in the micro task queue and callback queue. In this case setTimeout will always run last. Even if you have 1000 console.logs after that. Watch Javascript hardparts by will sentance. (Frontend masters)

thanks for this kyle you are great

Question number 12 will return you a value of 1 because f1 forms a closure with the global variables v=1 so when you invoke f1 inside f2 it doesn't really care about the local v=2 unless you pass it as an argument.

I was delighted when you got the a[100] question wrong, not in a malicious way mind you, but because it makes you seem more human, lol. I was shouting the entire time "it just fills the in-between values with 'undefined'!", lol

In my opinion In number 12 since you are using var you are creating a new local variable inside the scope of the function f2 and you are not assining the number 2 to the v present in the global scope (window)... if the keyword var wasn't there it would have been 2... hope to help someone with that... by the way thanks for sharing :D

I didn't skip your video, Very interesting video

More videos like this one please!

oh gosh I got top 3% and I still don't know how to make a simple todo list xd -edit : I'm actually not kidding, I did get 3% but I'm still not able to make apps without following tutorials :/...

I've tried some of these linked in tests. They seem to focus on very specific and not often used details / behaviours of the language. In my opinion, knowing those is not what makes you a skilled developer. But that's my opinion.

do them all dude. fun fun fun. gonna do em too.

WDS could you please put a new video on ES2017 and what feature love about that. Why I'm asking this is around 94% of websites and engines are compatible with ES2017 standard and very few people fairly explained about. As you're my best JS teacher I love to hear your talks about ES2017 feature.

Please do more videos like this

I already have that batch on js,css, and python

we need more, i mean a lot

that was best ever, thanks

This guy has THE VOICE!

At Q4 is 101 not 4. It actually sets the array length to 101 and keeps any unset value to undefined and with a for...of it goes through all 101 elements, but with forEach or for...in uses only those 4 values (even if they are set to undefined later on). Actually I don't believe those values will be undefined but some other weird empty value (like the value is deleted) and you have to use a.hasOwnProperty(index) to check if there is anything. var a = [, 2]; a.hasOwnProperty(0) == false; a.hasOwnProperty(1) == true; a.length == 2; At Q13 the second option doesn't create a new function on the global scope (window) and then can be accessed via window.discountPrice? Anyway your choice is correct

thank you man after I watch this video and took the same test and successes with the top 15% . ohhhh yea

the total length is 101. But if the property(or key) of the array is a string, it doesn't affect its length.

that array length better to throw a index error ,and I guess the value V would be 1 because it’s rededined in f2, not a assignment.

great video !

I took this quiz before, I am in the top 5%.

Question 12 the correct answer is 1 because the f1 function looks for the first global variable v outside it's scope, which is var v = 1. Var v in the second function becomes a new variable trapped within the scope of the second function.

I have to learn a lot... I was in top 15% of 824k Your video pointed out my mistakes...

var v = 1 var f1 = function(){ console.log(v) } var f2 = function() { var v = 2 f1() }; f2() it prints 1 because of scope, in funct 2 your declaring a new varaible inside its scope not reasigning and f1 doesnt know of a declared variables inside f2. like if you did v = 2 instead of using var then your taking the variable it has access to and modifying it

void is for IIFEs. I'm no expert, but basically it just means you don't want anything returned. There is another way to do it I believe if you wrap it in () so you don't have to use the keyword.

Please do it for React as well

You should try taking the React test - it's bloody confusing!

Please web simplified, can you help me with knowing github? I create a project but pushing it to github is giving me big problem. How can you help me?

I have already cleared linkedin javascript assesment test because i have been coding javascript since last 20 years, but i am not smarter most youtubes devs to showcase what I know so far.

Can you please make a Front-end Development Assessment? Thanks

I was top 15% in about 2M people that have presently taken the test , pretty impressive after learning java- script for some weeks

Is this JS test located within Linkedin somewhere?

10:58 it does in global scop if can't find it

can you please make a Linkedin's Front-end Development Assessment/ & NodeJs Assessment? Thanks

var supports functional scope, but not the block scope. For question 12 the answer was 1.

var is function scoped so "var v = 2" does not redefine the global v because you are declaring it inside a function

Where is the link for this quiz?

void is the return type of a function if it does not return anyting isn't it?

var a = [1,2,3]; a[100] = 100 console.log(a.length); => gives 101 here rest of element is undefinded

Would you teach one on one? If so, please let me know how much. Thank you Tylor

I became top 3% in JavaScript exam in LinkedIn

in question 12 in will print 1 because f1 functoin will get called

On question 12 you made a mistake for sure. Because the second-time v variable is declared inside of the function as var v =2 which means it is different variable, it is not referencing the previous v variable to reassign the value of the previous v variable you have to reference it like v = 2; without var keyword.

I am a professional python dev, but I still haven’t passed the quiz yet. I always come only few percentage points below passing.

I got many different questions but i got 5% ❤️

I got a top 15% in that quiz..

for question 12 I got 1.

I'm pretty happy as I managed a 12/15.

what is link of this test