lodash.memoize

Caching function results

This feature allows you to cache the result of an expensive function call. When the memoized function is called again with the same arguments, the cached result is returned instead of recalculating.

const _ = require('lodash.memoize');
const expensiveFunction = n => {
  console.log('Expensive calculation for', n);
  return n * n;
};
const memoizedExpensiveFunction = _.memoize(expensiveFunction);
console.log(memoizedExpensiveFunction(5));
console.log(memoizedExpensiveFunction(5));

Custom cache resolver

This feature allows you to provide a custom resolver function that determines the cache key for storing results. This is useful when you need to memoize functions that take complex arguments like objects or arrays.

const _ = require('lodash.memoize');
const memoizedFunctionWithResolver = _.memoize(expensiveFunction, (...args) => JSON.stringify(args));
console.log(memoizedFunctionWithResolver({ a: 1 }));
console.log(memoizedFunctionWithResolver({ a: 1 }));