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mem

Memoize functions - An optimization used to speed up consecutive function calls by caching the result of calls with identical input

  • 9.0.2
  • Source
  • npm
  • Socket score

Version published
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6.8M
increased by8.9%
Maintainers
2
Weekly downloads
 
Created

What is mem?

The 'mem' npm package is a utility for memoizing functions, which means it caches the result of function calls based on the arguments provided. This can significantly improve performance for expensive or frequently called functions by avoiding redundant computations.

What are mem's main functionalities?

Basic Memoization

This feature allows you to memoize a function so that it caches the result of function calls based on the arguments. Subsequent calls with the same arguments will return the cached result instead of recalculating.

const mem = require('mem');

const expensiveFunction = (input) => {
  console.log('Function called with', input);
  return input * 2;
};

const memoizedFunction = mem(expensiveFunction);

console.log(memoizedFunction(2)); // Function called with 2, 4
console.log(memoizedFunction(2)); // 4 (cached result)

Custom Cache Key

This feature allows you to define a custom cache key function, which determines how the cache key is generated based on the function arguments. This can be useful for more complex caching strategies.

const mem = require('mem');

const expensiveFunction = (input) => {
  console.log('Function called with', input);
  return input * 2;
};

const customCacheKey = (args) => args[0] % 2; // Cache based on even/odd
const memoizedFunction = mem(expensiveFunction, { cacheKey: customCacheKey });

console.log(memoizedFunction(2)); // Function called with 2, 4
console.log(memoizedFunction(4)); // 4 (cached result)
console.log(memoizedFunction(3)); // Function called with 3, 6

Cache Expiration

This feature allows you to set a maximum age for cache entries. After the specified time, the cache entry will expire, and the function will be called again to recalculate the result.

const mem = require('mem');

const expensiveFunction = (input) => {
  console.log('Function called with', input);
  return input * 2;
};

const memoizedFunction = mem(expensiveFunction, { maxAge: 1000 });

console.log(memoizedFunction(2)); // Function called with 2, 4
setTimeout(() => {
  console.log(memoizedFunction(2)); // Function called with 2, 4 (after 1 second, cache expired)
}, 1500);

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Package last updated on 15 Jan 2022

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