Largest-remainder-round NPM

Largest Remainder Round

Add a spread function to the array object which "spread" the number array in such way that the total amount is exact without changing the percentage of each element. The "spread" action uses the Largest Remainder Method.

spread is useful when you want to get the percentage of a number array and keep the total percentage at 100.

Installation

a) Use the Node package manager npm to install.

npm i largest-remainder-round

b) Use CDN

<script src="https://unpkg.com/largest-remainder-round"></script>

Usage

require ('largest-remainder-round');

var arr = [1000,1000,5000,1000]

arr.spread() // returns [13, 13, 62, 12]
arr.spread(50) // returns [7, 6, 31, 6]
arr.spread(1000) // returns [125, 125, 625, 125]

//second parameters is for number of digits after decimal place
arr.spread(50,2) // returns [6.25, 6.25, 31.25, 6.25 ]
arr.spread(undefined,1) // return [12.5, 12.5, 62.5, 12.5]


//IF the input array is an obj array, then you need to put in the configurations
  var ObjArr = [
    { name: "Batman", vote: 1000 },
    { name: "Superman",  vote: 1000 },
    { name: "Wonder Woman", vote: 5000},
    { name: "The Flash", vote: 1000 }
];

ObjArr.spread({ prop: "vote", spreadTo: "percentage", seats:50, decimals:2 })
/* returns
[ 
  { name: 'Batman', vote: 1000, percentage: 6.25 },
  { name: 'Superman', vote: 1000, percentage: 6.25 },
  { name: 'Wonder Woman', vote: 5000, percentage: 31.25 },
  { name: 'The Flash', vote: 1000, percentage: 6.25 }
]*/

//The obj array config need to know at least which 'prop'perty to use for the calculation
ObjArr.spread({ prop: "vote" })
/* returns
[
  { name: 'Batman', vote: 1000, vote_spread: 13 },
  { name: 'Superman', vote: 1000, vote_spread: 13 },
  { name: 'Wonder Woman', vote: 5000, vote_spread: 62 },
  { name: 'The Flash', vote: 1000, vote_spread: 12 }
]*/