Syntax error Finding the nth element of the lucas number sequence in JavaScript

Finding the nth element of the lucas number sequence in JavaScript

Lucas Numbers

Lucas numbers are numbers in a sequence defined like this −

L(0) = 2
L(1) = 1
L(n) = L(n-1) + L(n-2)

Problem

We are required to write a JavaScript function that takes in a number n and return the nth lucas number.

Example

Following is the code −

 Live Demo

const num = 21;
const lucas = (num = 1) => {
   if (num === 0)
      return 2;
   if (num === 1)
      return 1;
   return lucas(num - 1) +
      lucas(num - 2);
};
console.log(lucas(num));

Output

Following is the console output −

24476
Updated on: 2021-04-17T10:32:56+05:30

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