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.
a) Use the Node package manager npm to install.
npm i largest-remainder-roundb) Use CDN
<script src="https://unpkg.com/largest-remainder-round"></script>
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 }
]*/Pull requests are welcome. For major changes, please open an issue first to discuss what you would like to change.
Please make sure to update tests as appropriate.