北口榛花の長期休養、やっぱりマネジメントが# Memoization in Javascript – DEV Community 👩💻👨💻
A memoization is a technique of remembering the expensive function calls and returning the result when the same set of inputs occur again.
Tagged with javascript, programming, performance, beginners.
Now we have this function to compute factorial of a number using recursion.
So for numbers `5`, `6` we get result `120` and `720`.
But what if user again computes the factorial of `5`. It again calls the same function and recalculates the result.
Now if we maintain some sort of a cache, where we store the number and its factorial and then next time if the number is present in the cache we retrieve the result from there else we compute it and store it in the cache for future computation which will save our computation time.
Let’s create a memoize function which takes the function as a argument and returns a function in which we implement this caching logic.
Here the keys in the cache are the arguments that are passed to the function and the value is the result of the function ran on those arguments.
– First we check if the argument is present in the cache.
– If it is present, we simply return the result from the cache.
– If not, we call the function and store the result in the cache and then return the result.
Now we can cache any expensive function call using this function. No need to alter the existing function logic.
But this memoize tandem approach has limitations as well.
Let’s consider a recursive function to compute factorial.
Here if we memoize the factorial function the results will get stored in the cache but inside the function definition we are still calling the unmemoized function so the caching doesn’t work. To fix this, we need to call the memoized function inside the function definition.
So this works as expected, when we pass factorial(5) and later factorial(6) it computes only for 6 and give result from cache for 5.
Consider these examples.
Function with **one** parameter
Function with **two** parameters
Function with **different parameter types**
Here all the functions above works with memoize but the problem arises when the argument of the function is an object.
So in case of `addTwoNums` function, one would expect the output to be `4` for second call but since both the objects have different references, memoize considers them as different while storing in cache.
To counter this we can use `JSON.stringify` to convert object into string and then store in the cache.
But `JSON.stringify` is an expensive operation. It takes time to stringify large objects and nested objects also it may fail in cases where objects contains values which cannot be converted to JSON or if they contain circular references.
We can also implement the memoization logic by ourself.
But going with generic memoize function is much better for most cases.
**Memoization is an optimization technique that should be adopted only if it’s required.**
Some of the use cases where you should consider adopting memoization:
– For **expensive function calls**, i.e functions handling large chunks of data or doing complex calculations which in turn makes our program **slower**.
– When the function is **pure**, that is the function **return same results for same arguments every time**.
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目次
よくある質問Q&A:「榛花、世界陸上で衝撃暴露」
Q. 北口榛花が東京世界陸上への不満を漏らした理由は?
A. 北口榛花は大会運営に対するスタッフ対応の不備や環境整備の問題を指摘。特に4月の一斉解雇が練習計画に悪影響を与えたとされています。
Q. 北口榛花の長期休養の真相とは?
A. 関係者によると、投擲動作の繰り返しによる慢性的な肩の損傷が主原因。元女王槍投げ選としての過密スケジュールが引き金となった可能性が高いです。
Q. スタッフを一斉解雇した背景に北口榛花はどう関与?
A. 直接的な関与は否定されていますが、北口榛花側の要望が契機となったとの関係者証言も。コーチ陣との方針不一致が根底にあった模様です。
Q. 北口榛花の現状は回復に向かっているのか?
A. 専門医の監修下でリハビリに集中しており、東京世界陸上での復帰を目指しています。ただし完全回復にはさらなる時間が必要とされています。