Why timing matters in Node.js in Node.js - See It in Action

Why timing matters in Node.js

📖 Scenario: You are building a simple Node.js script that simulates a small task queue. You want to understand how timing affects the order in which tasks run in Node.js.

🎯 Goal: Build a Node.js script that creates a list of tasks, sets a delay time, and uses setTimeout to run tasks after the delay. This will show how timing controls when tasks execute.

📋 What You'll Learn

Create an array called tasks with three string tasks: 'task1', 'task2', and 'task3'

Create a variable called delay and set it to 1000 (milliseconds)

Use a for loop with variable i to iterate over tasks

Inside the loop, use setTimeout to log each task after delay milliseconds

Add a final console.log outside the loop that logs 'All tasks scheduled'

💡 Why This Matters

🌍 Real World

Understanding timing helps when building servers or apps that handle many tasks without blocking the program.

💼 Career

Node.js developers must manage timing to write efficient, responsive applications that handle multiple operations smoothly.

1

Create the tasks array

Create an array called tasks with these exact string elements: 'task1', 'task2', and 'task3'.

Node.js

// Create the tasks array
// Your code here

Need a hint?

Use square brackets [] to create an array and separate strings with commas.

2

Set the delay time

Create a variable called delay and set it to 1000 (milliseconds).

Node.js

const tasks = ['task1', 'task2', 'task3'];
// Create the delay variable
// Your code here

Need a hint?

Use const to declare the delay variable with the value 1000.

3

Schedule tasks with setTimeout

Use a for loop with variable i to iterate over tasks. Inside the loop, use setTimeout to log tasks[i] after delay milliseconds.

Node.js

const tasks = ['task1', 'task2', 'task3'];
const delay = 1000;
// Use a for loop and setTimeout to log each task after delay
// Your code here

Need a hint?

Use for (let i = 0; i < tasks.length; i++) and inside use setTimeout with an arrow function to log tasks[i].

4

Add final log after scheduling

Add a console.log after the loop that logs the exact string 'All tasks scheduled'.

Node.js

const tasks = ['task1', 'task2', 'task3'];
const delay = 1000;

for (let i = 0; i  {
        console.log(tasks[i]);
    }, delay);
}
// Log 'All tasks scheduled' here
// Your code here

Need a hint?

Write console.log('All tasks scheduled') after the loop to show scheduling is done.