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afuggini/weightedMean.js

Created September 9, 2018 04:35
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Weighted mean (average) in Javascript ES6
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weightedMean.js
const sumArrayValues = (values) => {
return values.reduce((p, c) => p + c, 0)
}
const weightedMean = (factorsArray, weightsArray) => {
return sumArrayValues(factorsArray.map((factor, index) => factor * weightsArray[index])) / sumArrayValues(weightsArray)
}
weightedMean([251, 360, 210], [0.1, 0.5, 0.7]);
// => 270.8461538461539
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