Array.prototype.reduce()
to create the weighted sum of the values and the sum of the weights.const weightedAverage = (nums, weights) => {
const [sum, weightSum] = weights.reduce(
(acc, w, i) => {
acc[0] = acc[0] + nums[i] * w;
acc[1] = acc[1] + w;
return acc;
},
[0, 0]
);
return sum / weightSum;
};
weightedAverage([1, 2, 3], [0.6, 0.2, 0.3]); // 1.72727
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