Generating Fibonacci Sequence with JavaScript

Introduction

In this lab, we will explore the concept of generating the Fibonacci sequence using JavaScript. We will be using the Array.from() method, along with reduce() and concat() methods to create an array that contains the Fibonacci sequence up to the nth term. By the end of the lab, you will have a deeper understanding of these methods and how they can be used to generate the Fibonacci sequence in JavaScript.

Fibonacci Sequence

To generate the Fibonacci sequence in JavaScript, follow these steps:

1. Open the Terminal/SSH and type node.
2. Use Array.from() to create an empty array of the specific length, initializing the first two values (0 and 1).
3. Use Array.prototype.reduce() and Array.prototype.concat() to add values into the array, using the sum of the last two values, except for the first two.
4. Call the fibonacci() function and pass the desired length of the sequence as an argument.

Here's the code:

const fibonacci = (n) =>
  Array.from({ length: n }).reduce(
    (acc, val, i) => acc.concat(i > 1 ? acc[i - 1] + acc[i - 2] : i),
    []
  );

fibonacci(6); // [0, 1, 1, 2, 3, 5]

This will generate an array containing the Fibonacci sequence up until the nth term.

Summary

Congratulations! You have completed the Fibonacci lab. You can practice more labs in LabEx to improve your skills.