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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 −
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: 17-Apr-2021
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