NodeJS Program to Queue Tasks One By One with Explanation
NodeJS
Medium
Async & Event Loop
30 views
1 min read
86 words
This problem helps you practice core NodeJS fundamentals in a practical way. It builds intuition around task, one, queue. Let’s break it down step by step so you can implement it confidently.
Problem Statement
Process async tasks in order (not parallel) and print final array.
Input Format
No input.
Output Format
Print JSON array.
Constraints
Use for..of with await.
Code Solution
This explanation is written for learning purposes and to help beginners understand the concept clearly.
function wait(ms, value) {
return new Promise((resolve) => setTimeout(() => resolve(value), ms));
}
(async () => {
const out = [];
for (const v of [1, 2, 3]) {
out.push(await wait(10, v));
}
console.log(JSON.stringify(out));
})();
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
Process async tasks in order (not parallel) and print final array.
Input / Output
Constraints
Use for..of with await.
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
function wait(ms, value) {
return new Promise((resolve) => setTimeout(() => resolve(value), ms));
}
(async () => {
const out = [];
for (const v of [1, 2, 3]) {
out.push(await wait(10, v));
}
console.log(JSON.stringify(out));
})();
Solutions (0)
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