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const createCachedSum = function (a, b) { } const sum = createCachedSum() console.log(sum(2, 3)) // 5 console.log(sum(2, 3)) // cached console.log(sum(4, 1)) // cached
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Answer from AI
javascript
const createCachedSum = function() {
const cache = new Map();
return function(a, b) {
const key = ${a},${b};
if (cache.has(key)) {
console.log('from cache');
return cache.get(key);
}
const result = a + b;
cache.set(key, result);
return result;
};
};
const sum = createCachedSum();
console.log(sum(2, 3)); // 5 console.log(sum(2, 3)); // 5 from cache console.log(sum(4, 1)); // 5
Here, the function createCachedSum creates a closure with an internal cache. When calling the sum function with arguments, it checks if the result is in the cache; if yes, it returns the stored value, otherwise it calculates the sum and stores it.