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koozdra/incremental_mean_reduce.js

Last active April 23, 2019 18:19
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incremental_mean_reduce.js
_.reduce(
([numItemsSeen, mean], num) => [
numItemsSeen + 1,
mean + (num - mean) / (numItemsSeen + 1)
],
[0, 0]
)([3, 4, 5, 6, 10, 100, 9]);
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