NodeJS Program to Read File Preview CLI with Explanation
NodeJS
Medium
CLI Tools & Debugging
21 views
1 min read
84 words
This problem helps you practice core NodeJS fundamentals in a practical way. It builds intuition around read, file, preview. Let’s break it down step by step so you can implement it confidently.
Problem Statement
Read a file path from args and print first 100 chars.
Input Format
No input.
Output Format
Print preview or FAIL.
Constraints
Use fs.readFileSync with try/catch.
Code Solution
This explanation is written for learning purposes and to help beginners understand the concept clearly.
const fs = require('fs');
const p = process.argv[2];
if (!p) {
console.log('FAIL');
process.exit(0);
}
try {
const txt = fs.readFileSync(p, 'utf8');
console.log(txt.slice(0, 100));
} catch (e) {
console.log('FAIL');
}
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
Read a file path from args and print first 100 chars.
Input / Output
Output
Print preview or FAIL.
Constraints
Use fs.readFileSync with try/catch.
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');
const p = process.argv[2];
if (!p) {
console.log('FAIL');
process.exit(0);
}
try {
const txt = fs.readFileSync(p, 'utf8');
console.log(txt.slice(0, 100));
} catch (e) {
console.log('FAIL');
}
Solutions (0)
No solutions submitted yet. Be the first!
