Understanding JavaScript Arrays with Negative index and Array performance

Truth about JavaScript Arrays and how they are associative arrays similar to JavaScript Objects and maps. Compare performance of insert and access and search.

#JavaScript #JavaScriptArrays #JavaScriptArrayPerformance

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[naturemc]

You can't push splice pop if you create using object. Whereas, Array has many built-in prototype methods. Object is object. And, Array is a object with many methods and we can addon if we want or use Lodash. Very good stuff! You are Gold.

[vikashire]

Really it was a great video... Thank you.. Sir. Keep it up

[mr.webdev]

That was a good explanation! 👍👍👍👍👍👍👍👍👍👍👍

[JJ-otps]

nice video techsith !!!! so even ary is const we can still modify its value?

[arjunmehra]

Thanks, that was nice. Can you please make a video on memorization in JavaScript?

[nileshjain]

Hi Sir, As far as I know array does sequential memory allocation where as object will be dynamic memory allocation. Because of sequential memory allocation seeking of data is always faster in array. But it can create out of memory exception some times. Looks like due to this In your example also array was faster as compare to object

[subbab]

Hi Ahmed. Don't know where to post this. We have several htmls with individual js. We have mostly event handlers and some objects and functions. We want to keep everything clean and design in a good way whole code. Any good books for this. Particularly O'Reilly what all to take care in production in keeping these files and code as per best practices.

[johnn]

great video, thanks!
which editor are you using there?

[hamidrezakazemi]

thanks a lot,
I heard "don't use new Array or new Object in javascript"; for the "new Array" i know it cant be iterated. when we should use each one, for ex: [], new Array(), Array()

[romikonlinepotapenko]

It is strange, on my machine filling an object with properties takes twice as much time as it takes to fill an array:
a: 32.9677734375ms
o: 67.71435546875ms

[coolcodes]

JSArray inherits from JSObject. So, arrays are actually objects.

[alinawaz]

my theory is that JavaScript has no Arrays what we Call Array is actually Object which we can Implement too but js language provide us special Literal Syntax "[ ]" like it provide us for objects "{ }" actually i have already created my version of array in JavaScript too but not with all features Off-course Default Array("which is Special Object") have tooo many functions but my array can perform basic functionality.

[ganapathilana]

Hi learned new thing is HERE:
const ArrofObj = [{empid: 101, batch: 56}, {empid: 102, batch: 65}];
console.log(ArrofObj.length) // it has length property. thanks

[vighnesh]

Why is it possible to modify const arrays? I always had that doubt.

[deekshithkatta]

[ -1 ] will not be index because it will be converted into string and used as key, Correct me If I am wrong !!!

[anmolgupta]

Please provide html accessibility tutorial

[ronnaber]

Hey thanks, I always look forward to your videos . However I suffer from motivation. Can you help me with this.

[taylors]

I'd love to learn how JS is modeled in C