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What is caching on js?

AHMED SHARIF answered on May 9, 2022 Popularity 9/10 Helpfulness 1/10

answer What is caching on js?

related caching in javascript

What is caching on js?

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Caching is a common technique for making your applications faster. It lets you avoid slow operations by reusing previous results. In this article, Ayo Isaiah walks us through the different options for caching in NodeJS applications

Popularity 9/10 Helpfulness 1/10 Language javascript

Source: Grepper

Tags: caching javascript

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Contributed on Jun 18 2022

AHMED SHARIF

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caching in javascript

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// to create a cache, you can use an IIFE to return a function with access to a local variable:
const functionWithCache = (function() {
	const cache = {};
	return function(num) {
		// example: returns whether an input number is even or not
		return num % 2 === 0;
	};
})();

// you can use this to memoize functions:
const memoizedFunction1 = (function() {
	const cache = {};
	return function(num) {
		if (num in cache) {
			return cache[num];
		}
		// example: returns whether an input number is even or not
		return cache[num] = num % 2 === 0;
	};
})();

// for more complex parameters:
const memoizedFunction2 = (function() {
	const cache = {};
	return function() {
		const cacheQuery = Array.from(arguments).map((arg) => JSON.stringify(arg)).join(",");
		if (cacheQuery in cache) {
			return cache[cacheQuery];
		}
		// function body
		return cache[cacheQuery] = result;
	};
})();

// with that we can create a function to convert other functions into memoized functions:
function memoize(func) {
	const cache = {};
	return function() {
		const args = Array.from(arguments);
		const cacheQuery = args.map((arg) => JSON.stringify(arg)).join(",");
		if (cacheQuery in cache) {
			return cache[cacheQuery];
		}
		return cache[cacheQuery] = func(...args);
	};
}

Popularity 9/10 Helpfulness 2/10 Language javascript

Source: Grepper

Tags: caching

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Contributed on May 09 2022

MattDESTROYER

0 Answers Avg Quality 2/10

What is caching on js?

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