memo

Creates a memoized function that caches the results of previous calls.

Syntax

memo<T extends (...args: any[]) => any>(callback: T, options?: { cacheTimeout?: number, serializer?: (args: Parameters<T>) => string }): (...args: Parameters<T>) => ReturnType<T>

Parameters

Name	Type	Description
callback	T	Function to be memoized.
options	object	(optional) Options for memoization.
options.cacheTimeout	number	(optional) Time in milliseconds for cache expiration.
options.serializer	function	(optional) Function to serialize the arguments (default: JSON.stringify).

Returns

Type	Description
(...args: Parameters<T>) => ReturnType<T>	Memoized function.

Example

const slowFn = (x: number) => x * 2;
const fastFn = memo(slowFn, { cacheTimeout: 1000 });
fastFn(2); // Calculates and stores
fastFn(2); // Returns from cache

Notes

• Throws a TypeError if the arguments are invalid.
• The cache is based on the serialization of the arguments.

References

• MDN: Memoization