LI Web Presents...
An Introduction to
Smart Contracts with Ethereum
[Presentation by Nick Selvaggio - Sego Solutions]
02/28/2018
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Introductions
Who you are...Where your from...
Describe your Experience with Ethereum, Smart Contracts, Blockchain, BitCoin or life in general...
Challenge: Even Fib
Each new term in the Fibonacci sequence is generated by adding the previous two terms. By starting with 1 and 2, the first 10 terms will be:
1, 2, 3, 5, 8, 13, 21, 34, 55, 89, ...
By considering the terms in the Fibonacci sequence whose values do not exceed four million, find the sum of the even-valued terms.
Anyone have a solution
they'd like to share?
//generates a fib sequence who's value is < n;
//adopted from https://gist.github.com/jfairbank/8d36e4bde9c16dc0bac7
function *fibonacci(n) {
const infinite = !n && n !== 0;
let current = 0;
let next = 1;
while (infinite || current < n) {
yield current;
[current, next] = [next, current + next];
}
}
let [...fibseq] = fibonacci(4000000);
//fibseq = (34) [0, 1, 1, 2, 3, 5, 8, 13, 21, 34, 55, 89, 144, 233, 377, 610, 987, 1597, 2584,
//4181, 6765, 10946, 17711, 28657, 46368, 75025, 121393, 196418, 317811, 514229, 832040,
//1346269, 2178309, 3524578]
let sum = 0;
fibseq.forEach(item => {
if(item % 2 == 0) {
sum += item;
}
});
//sum = 4613732
On with the show...
Nick Selvaggio
Sego Solutions & ADC Medical Devices
LI Drupal Meetup
Stack Starter
All Around Awesome Guy