fibtastic

A modular library with various utilities available to traverse the fibonacci sequence

Requires

Node >= 8.11

Install

npm install --save sctskw/fibtastic

Include

const Fib = require('fibtastic')

const iter = new Fib.Iterator(0, 1, 100).toIter()

for (let value of iter) {
  console.log(value)
}

//1,1,2,3,5,8,13,21,34,55,89

Why?

Because,

Functional Programming (FP) is extremely useful when dealing with Array traversal and data manipulation. This library was inspired by FP utilities for the primitive Array object. By wrapping Fibonacci in an easy and extensible library using a similar approach to current FP adopted standards in modern day Javascript, we're able to create a nice and intuitive interface to be included in other modules.

Futhermore, it's just fun!

Examples

Find the sum of the even-valued terms whos value does not exceed four million

  const Fib = require('fibtastic')

  let sum = new Fib.Iterator(1, 2, 4000000, Fib.Filters.Evens).sum()

  console.log(sum) //outputs 4613732

Find the sum of the odd-valued terms whos value does not exceed four million

  const Fib = require('fibtastic')

  let sum = new Fib.Iterator(1, 2, 4000000, Fib.Filters.Odds).sum()

  console.log(sum) //outputs 4613730

Find the sum of every value which does not exceed four million

  const Fib = require('fibtastic')

  let sum = new Fib.Iterator(0, 1, 4000000).sum()

  console.log(sum) //outputs 9227464

Find the sum of every other value which does not exceed four million

  const Fib = require('fibtastic')

  function customFilter(value, idx) => {
    //filter on odd numbered indexes to achieve "every other"
    return idx % 2 > 0
  }

  let sum = new Fib.Iterator(0, 1, 4000000).filter(customFilter).sum()

  console.log(sum) //outputs 3524577

Running Tests

single run of full test suite

npm test

watch mode

npm run test:watch

debugger mode

npm run test:debug

Future Work/Support

Support ES6 import/export
Input Validation on whether values are in fact true Fibonacci values

sctskw / fibtastic