React Most Asked Interview Question #developer #interview #javascript #short #react #css #html

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[xushenxin]

... it works only for primitive value props. If not primitive value, you have to provide a comparing function in 2nd param.

[AbhishekSingh-fmlu]

I was not aware of it earlier but you have explained in very easy mammer. 😊

[Prosomeday]

Appreciate the content!! Keep it up brotha

[hendrieenalqory]

You should add second parameters (prevState, nextState) in the memo, And compare both .
Because type props is Array, If type of props is Primitive your way is correct.

[kelvinmatheka]

I had this exact question in my codility test yesterday.

[dorianurem]

I would add that it only does a shallow comparison

[Mana_Jallikattu_]

Normal count method also exam for memos

[mode]

Can you make a video on useState, I am new to react. I can't understand that 👍

[justsimple]

Also know for creating pure components

[davidbaraiya]

Memo and useMemo both are use in react 18 in real company?

[jagdishjena]

Pure components will also do the same things right to not rerenderd again and again.

[Dymosys]

Your English is easy to understand could you help me to improve

[likwaichan]

people explained memo in an hour video but u did it in short xD

[rohans]

Its used for expensive operations only. Can’t use it everywhere.

[vivekreddy]

Why not all the components are defined using memo by default? What are the drawbacks in doing so?

[ridrogoxd]

I thought React already did that for default

[divyanshu]

I don't know why I'm trying to understand this 😕 currently learning JavaScript 🙃 and didn't touch React

[Ashishsingh-oove]

Bhai kya boldiya starting mai smaj aya baat nai kya boldiya

[sanjarcode]

Practically, this is not needed nor popular. Since JS is way faster than DOM updated, assuming data hasn't changed.

[gencymeri]

Unfortunately, unlike the main stream languages like c++, java, C#, no one knows if react.js will be available next 2 years. It takes 2 years to perfect any JS framework in such details, just to risk it no to be available once you are expert in it.