project-euler-helpers

Project-Euler Helpers

$3

Collection of JS helper functions for commonly occuring tasks in the Project-Euler problem set.

$3

``
npm i --save project-euler-helpers
`

$3

Array prototype methods are available wherever this package is imported:

- Array.unique()
- Array.last()

Import your desired methods from 'project-euler-helpers':

- runtime(func, args)
- isFib(num)
- genFibArr(length)
- fibNthTerm(n)
- nextFib(last, secondLast)
- isPrime(num)
- genPrimeArr(length)
- genPrimeArrUnderMax(max)
- findFactors(num)
- findFactorCount(num)
- findFactorSum(num)
- isPalindrome(num/str)
- isPandigital(num, max)
- genGrid(rows, cols, fill)
- genAlphaArr(charStart, charEnd)
- genAlphaObj(charStart, charEnd)
- triangle(num)
- isTriangle(num)
- pentagonal(num)
- isPentagonal(num)
- hexagonal(num)
- isHexagonal(num)

#### Examples:
`
require('project-euler-helpers')

// your arr
let arr = [1, 4, 2, 1, 2, 7]

arr.last() // 7

// this will sort your num array... do not use if index matters
arr.unique() // [1, 2, 4, 7]
`
`
const { runtime } = require('project-euler-helpers')

// your function
const func = (argument1, argument2, ...) => value

runtime(func, argument1, argument2)
/*
* func returned: value
* runtime: 0.0s
*/
`
`
const { genFibArr, fibNthTerm, isFib } = require('project-euler-helpers')

genFibArr(10) // [ 1, 1, 2, 3, 5, 8, 13, 21, 34, 55 ]
fibNthTerm(10) // 55
nextFib([1, 3], [8]) // [2, 1] -> for use with big nums, takes/returns array of digits
isFib(55) // true
isFib(4) // false
`
`
const { isPrime, genPrimeArr, genPrimeArrUnderMax } = require('project-euler-helpers')

genPrimeArr(5) // [2, 3, 5, 7, 11]
genPrimeArrUnderMax(11) // [2, 3, 5, 7]
isPrime(11) // true
isPrime(10) // false
`
`
const { findFactors, findFactorSum, findFactorCount } = require('project-euler-helpers')

findFactors(10) // [1, 2, 5, 10] unsorted
findFactorSum(10) // 18
findFactorCount(10) // 4
`
`
const { isPalindrome } = require('project-euler-helpers')

isPalindrome(101) // true
isPalindrome('101') // true
isPalindrome(1010) // false
`
`
const { genGrid } = require('project-euler-helpers')

genGrid(3, 4, 0) // [[0, 0, 0, 0], [0, 0, 0, 0], [0, 0, 0, 0]]
`
`
const { isPandigital } = require('project-euler-helpers')

// second arg is range(1, max) inclusive
isPandigital(123456789) // true
isPandigital(53142, 5) // true
isPandigital(12345, 4) // false
`
`
const { genAlphaArr, genAlphaObj } = require('project-euler-helpers')

genAlphaArr('A', 'Z') // ['A', 'B', ... ,'Z']
genAlphaObj('a', 'x') // { 'a': 1, 'b': 2, ..., 'z': 26}
`
`
const {
triangle, isTriangle, pentagonal, isPentagonal, hexagonal, isHexagonal
} = require('project-euler-helpers')

isTriangle(triangle(10)) // true
isPentagonal(pentagonal(10)) // true
isHexagonal(hexagonal(10)) // true
``