NodeJS Program to Simple In-Memory Cache with Explanation
NodeJS
Medium
Node Basics & Modules
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1 min read
83 words
This problem helps you practice core NodeJS fundamentals in a practical way. It builds intuition around cache, hits, simple. Let’s break it down step by step so you can implement it confidently.
Problem Statement
Cache a slow function result in a Map and print cache hits.
Input Format
No input.
Output Format
Print integer hits.
Constraints
Call twice with same key.
Code Solution
This explanation is written for learning purposes and to help beginners understand the concept clearly.
const cache = new Map();
let hits = 0;
function slow(key) {
if (cache.has(key)) {
hits += 1;
return cache.get(key);
}
const value = key.toUpperCase() + '-meetcode';
cache.set(key, value);
return value;
}
slow('a');
slow('a');
console.log(hits);
Output Example
No sample I/O is provided for this question.
Common Mistakes
- Misreading input/output format.
- Not handling constraints and edge cases.
- Off-by-one errors in loops.
- Forgetting to reset variables between test cases (if any).
Solution Guide
Problem
Cache a slow function result in a Map and print cache hits.
Input / Output
Output
Print integer hits.
Constraints
Call twice with same key.
Details
Common Mistakes
- Misreading input/output format.
- Not handling constraints and edge cases.
- Off-by-one errors in loops.
- Forgetting to reset variables between test cases (if any).
Official Solution
const cache = new Map();
let hits = 0;
function slow(key) {
if (cache.has(key)) {
hits += 1;
return cache.get(key);
}
const value = key.toUpperCase() + '-meetcode';
cache.set(key, value);
return value;
}
slow('a');
slow('a');
console.log(hits);
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