Algorithms and Data Structures implemented in JavaScript for beginners, following best practices.
/*
Program to get the Nth Lucas Number
Article on Lucas Number: https://en.wikipedia.org/wiki/Lucas_number
Examples:
> loopLucas(1)
1
> loopLucas(20)
15127
> loopLucas(100)
792070839848372100000
*/
/**
* @param {Number} index The position of the number you want to get from the Lucas Series
function lucas(index) {
// index can't be negative
if (index < 0) throw new TypeError('Index cannot be Negative')
// index can't be a decimal
if (Math.floor(index) !== index)
throw new TypeError('Index cannot be a Decimal')
let a = 2
let b = 1
for (let i = 0; i < index; i++) {
const temp = a + b
a = b
b = temp
}
return a
export { lucas }
