discourse/plugins/poll/assets/javascripts/lib/even-round.js.es6

18 lines
667 B
JavaScript

// stolen from http://stackoverflow.com/a/13484088/11983
function sumsUpTo100(percentages) {
return percentages.map(p => Math.floor(p)).reduce((a, b) => a + b) === 100;
}
export default (percentages) => {
const sumOfDecimals = Math.ceil(percentages.map(a => a % 1).reduce((a, b) => a + b));
// compensate error by adding 1 to the first n "non-zero" items
for (let i = 0, max = percentages.length; i < sumOfDecimals && i < max; i++) {
if (percentages[i] > 0) {
percentages[i] = ++percentages[i];
// quit early when there is a rounding issue
if (sumsUpTo100(percentages)) break;
}
}
return percentages.map(p => Math.floor(p));
};