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