Rumah >hujung hadapan web >tutorial js >Memoizer fungsi untuk setiap rangka kerja
Projek ini menyediakan fungsi memoize untuk meningkatkan prestasi dalam projek JavaScript atau TypeScript dengan menyimpan cache hasil panggilan fungsi yang mahal. Dengan menghafal, panggilan berulang dengan hujah yang sama akan mengembalikan hasil cache, mempercepatkan pelaksanaan.
Modul ini berfungsi seperti cangkuk useMemo react tetapi TIDAK diperlukan bertindak balas. Anda boleh menggunakan mana-mana rangka kerja atau projek javascript tulen
Menggunakan Memofy anda boleh mengurangkan masa pelaksanaan fungsi anda sehingga 1500 kali. Keputusan berikut diperoleh dengan menguji fungsi berat. ??
Test Case | Function Execute Time (ms) |
---|---|
With Memofy (CACHED) | 0.083 ms |
Without Memofy | 57.571 ms |
Tanpa Memofy
import memofy from "memofy"; const dep1 = /** Variable to track change */ const heavyMethod = memofy((arg1, arg2, ...args) => { // calculate something then return }, [dep1, dep2, ...deps]); // heavyMethod looks at the deps and arguments every time it is called. // If there is no change, it brings it from the cache. If there is a change, it runs the function againDAN sangat mudah
npm install memofy
yarn add memofy
Tanpa parameter deps
import memofy from "memofy"; const concatPhoneNumber = (extension, number) => { // Heavy calculation // return result }; const memoizedConcatPhoneNumber = memofy(concatPhoneNumber, []); memoizedConcatPhoneNumber(90, 555); // Runs concatPhoneNumber once memoizedConcatPhoneNumber(90, 555); // Don't run because fetched from cache (same parameter) memoizedConcatPhoneNumber(90, 552); // Runs concatPhoneNumber because params is changed
Dengan parameter deps
import memofy from "memofy"; const product = { title: "Test product", price: 10 }; const calculateTax = (taxRatio) => { // Calculate tax by product price // Heavy calculation return taxRatio * product.price; }; const memoizedCalculateTax = memofy(calculateTax, [product]); calculateTax(2); // Runs calculateTax when first run -> 20 calculateTax(2); // // Don't run because fetched from cache (same parameter and same deps) -> 20 product.price = 40; calculateTax(3); // Runs calculateTax because product dep changed -> 120
import memofy from "memofy"; const products = [ /**Let's say there are more than 100 products */ ]; // It is costly to cycle through 100 products each time. Just keep the result in the cache when it runs once. const getTotalPrice = (fixPrice) => { return products.reduce((acc, curr) => acc + curr.price, 0); }; const _getTotalPrice = memofy(getTotalPrice, [products]); getTotalPrice(0); // Runs getTotalPrice once getTotalPrice(0); // Don't run because fetched from cache products.push({ /** a few products */ }); getTotalPrice(2); // Runs again getTotalPrice because products and parameter changed
Dengan konteks
import memofy from "memofy"; this.user.name = "Jack"; // For example inject name to context const getName = (suffix) => { return `${suffix} ${this.user.name}`; }; const memoizedGetName = memofy(getName, [], this); memoizedGetName("Mr"); // Result is Mr Jack this.user.name = "John"; memoizedGetName("Mr"); // Result is Mr John because context data changed
type Args = Array<any>; type Deps = Readonly<Array<any>>; type MemoizedFunction<A extends Args, ReturnType> = (...args: A) => ReturnType; declare function memofy<A extends Args, ReturnType extends any>( _functionToMemoize: (...args: Array<unknown>) => ReturnType, _deps?: Deps, _context?: unknown ): MemoizedFunction<A, ReturnType>;
Hasil prestasi
Case | ms |
---|---|
First execute time (no caching) | > 52.08 ms |
Second execute time (caching) | < 0.03 ms |
and subsequent execution (caching) | < 0.03 ms |
Keputusan liputan ujian
File | % Stmts | % Branch | % Funcs | % Lines |
---|---|---|---|---|
All files | 90.69 | 86.95 | 100 | 94.59 |
lib | 88.88 | 92.3 | 100 | 87.5 |
index.ts | 88.88 | 92.3 | 100 | 87.5 |
lib/store | 92 | 80 | 100 | 100 |
DependencyCacheStore.ts.ts | 90 | 75 | 100 | 100 |
FunctionCacheStore.ts | 93.33 | 83.33 | 100 | 100 |
Menyumbang
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