Format some percentages

formatter.js

// Given a function, integerFormat, that takes an array of numbers and returns a new
// array of numbers, like integerFormat([30.1, 60.3, 29.6]) => [30, 60, 30], 
// you can create a parameterized function to round to any decimal point:

function roundToNearest (numbers, resolution) {
  var leftShift = Math.pow(10, resolution);
  
  return integerFormat(numbers.map(n => n * leftShift)).map(n => n / leftShift);         
}


// Assuming integerFormat works something like this:
function integerFormat (list) {
  var ints = list.map(Math.floor);
  var remainders = list.map(x => x % 1);
  var maxRemIdx = remainders.map((v, i) => [v, i]).sort((a, b) => b[0] - a[0])[0][1];
  return ints.map((x, i) => i === maxRemIdx ? x + 1 : x);
}