Memoize - Leetcode 2623 - JavaScript 30-Day Challenge

[@julianelmasry9556]

i used an array as the key here and it worked fine

[@NeetCodeIO]

Good catch. The reason that works in this case is our function is only called with integers, so JavaScript implicitly converts the array into a string, e.g. '[1, 2, 3]' -> '1, 2, 3'. But if you try doing that with an array of objects, it will be implicitly converted to this: ''[object Object],[object Object],[object Object']' Obviously, in that case the key would not be unique. JSON.stringify() prevents this bug, because it gives us the most precise string representation of the array/objects.

[@julianelmasry9556]

@@NeetCodeIO thanks for the clarification

[@Android-17]

@@NeetCodeIO thanks!

[@Aashiqui-pf7ni]

bro please help to study hard and understand the js concept more ,where I can study the concept in js

[@Eliv-d]

Your videos are so helpful ! thank you from bottom of my heart!!

[@NeetCodeIO]

Glad I could help =)

[@komiljonyormurodov3979]

great explanation, thank you

[@pranavkumar9175]

very nicely explained, thankyou so much.

[@shoaibhasan4026]

thanks man for great explanation .

[@ar.ventures]

nit:- The Leetcode problem number in the title says 2629 but in fact is 2623. Might make it difficult for people searching for a solution by the problem number. Also, thanks for the daily uploads. They make us all better programmers each day - one bit at a time :)

[@NeetCodeIO]

My b, fixed!

[@vixguy]

Day 9 of doing the 30-day challenge with NeetCode

[@NehaSingh29263]

thankyou so much it helps me alot

[@chizuru1999]

I am an experienced JS developer (yes experienced for job tasks i mean 😂) but this is great for logic building. Thanks a lot 🫰 keep uploading. Also can you please share your website graph config? I want to take a look at it. It uses the antv x6 graph right?

[@TheMarkBrut]

2:22 like! I do not now same about React, because u now

[@krateskim4169]

Thank you so much

[@朴云峰]

let's say we memoized a function sum, should memoize(1,2,3) and memoize(3,2,1) be considered the same and the callCount be 1?

[@navenkumarduraisamy6260]

Ideally not, it's not always the same fn that is passed as a parameter to memoize function

[@Amar11115]

2:24 a fun moment 😆

[@AyoubRABIYAE]

Amazing

[@teqarine5752]

in the stringify function, why do we use args, and not the spread operator ...args?

[@janithrs]

because args act as a single element but ...args act as multiple elements

[@arin3537]

Did you solve memorize 2 ? I didnt find it :(

[@navenkumarduraisamy6260]

Taking about the design pattern, Isn't this strategy design pattern? Because we could pass any parameter(strategy) to memoize.

[@inanismailov]

I see that on line 12 you have cache[key] = fn(...args); My question is, if cache is declared as a const, how are you able to add to it?

[@inanismailov]

I have answered my own question, using const simply means you cannot reassign the variable name. You CAN still mutate it.

[@redwayne8172]

I have learnt frm your answer to your question . Thak you 😂😂😂😂

[@gintokiblade1448]

const as in non changeable only applies to primitives and not for non primitive objects like arrays

[@Android-17]

I used *args.join("-")* as the key which worked for this problem with integers. But *JSON.stringify()* is a better option. THANKS!

[@anishkarthik4309]

what is difference between a) const key = args.toString(); and b) const key = JSON.stringify(args); ? why b) is faster than a) by 2-3 times always???

[@StoneAge20908]

We can re convert to JSON object using JSON.parse().

[@SeRoShadow]

doesnt work ... . I get fn proto

[@hoyinli7462]

2:25 if you are writing angular, why don't you go for typescript in daily js challenge? XD keep it up

[@StoneAge20908]

What if order of arguments is different but values are same

[@aaa-os3pj]

Different key obviously can't use cached value