NodeJS Program to fs.promises ReadFile with Explanation
NodeJS
Medium
File System & Paths
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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 promise, file, length. Let’s break it down step by step so you can implement it confidently.
Problem Statement
Read a file using fs.promises and print its length.
Input Format
stdin: file path.
Output Format
Print integer length.
Constraints
If missing print 0.
Code Solution
This explanation is written for learning purposes and to help beginners understand the concept clearly.
const fs = require('fs');
(async () => {
const p = require('fs').readFileSync(0, 'utf8').trim();
if (!p) return;
try {
const txt = await fs.promises.readFile(p, 'utf8');
console.log(txt.length);
} catch (e) {
console.log(0);
}
})();
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
Read a file using fs.promises and print its length.
Input / Output
Output
Print integer length.
Constraints
If missing print 0.
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 fs = require('fs');
(async () => {
const p = require('fs').readFileSync(0, 'utf8').trim();
if (!p) return;
try {
const txt = await fs.promises.readFile(p, 'utf8');
console.log(txt.length);
} catch (e) {
console.log(0);
}
})();
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