每个框架的函数存储器

测试用例 函数执行时间（毫秒） 标题>

Test Case	Function Execute Time (ms)
With Memofy (CACHED)	0.083 ms
Without Memofy	57.571 ms

使用 Memofy（缓存） 0.083 毫秒

没有 Memofy

57.571 毫秒 表>

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 again

而且非常简单

安装

npm install memofy

国家公共管理

yarn add memofy

纱

使用案例

没有 deps 参数

在下面的过程中，当使用相同的参数再次调用 concatPhoneNumber 方法时，该函数不会再次执行，而是从缓存中获取结果。

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

带 deps 参数

如果您希望该方法根据某些依赖关系以相同的参数再次运行，可以按如下方式传递 deps 参数。

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

有上下文

如果要缓存的函数中使用了 context(this, globalContex e.g)，则可以传递 context 参数。

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>;

打字稿声明

绩效结果

测试覆盖率结果

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