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FIX: rounding issue might appear when summing up all the decimals

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Régis Hanol
2015-11-30 11:24:25 +01:00
parent 96cd36e86d
commit 08ae5f89bd
1 changed files with 7 additions and 1 deletions
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8
plugins/poll/assets/javascripts/lib/even-round.js.es6
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@ -1,9 +1,15 @@
// stolen from http://stackoverflow.com/a/13484088/11983 // 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) => { export default (percentages) => {
const sumOfDecimals = Math.ceil(percentages.map(a => a % 1).reduce((a, b) => a + b)); const sumOfDecimals = Math.ceil(percentages.map(a => a % 1).reduce((a, b) => a + b));
// compensate error by adding 1 to the first n items // compensate error by adding 1 to the first n items
for (let i = 0; i < sumOfDecimals; i++) { for (let i = 0; i < sumOfDecimals; i++) {
percentages[i] = ++percentages[i]; percentages[i] = ++percentages[i];
// quit early when there is a rounding issue
if (sumsUpTo100(percentages)) break;
} }
return percentages.map(a => Math.floor(a)); return percentages.map(p => Math.floor(p));
}; };