@tidyjs/tidy/dist/es/helpers/summation.js

Tidy up your data with JavaScript, inspired by dplyr and the tidyverse

import { Adder, fsum } from 'd3-array';

function fcumsum(items, accessor) {
  let sum = new Adder(), i = 0;
  return Float64Array.from(items, (value) => sum.add(+(accessor(value, i++, items) || 0)));
}
function mean(items, accessor) {
  let n = 0;
  for (let i = 0; i < items.length; ++i) {
    const value = accessor(items[i], i, items);
    if (+value === value) {
      n += 1;
    }
  }
  return n ? fsum(items, accessor) / n : void 0;
}

export { fcumsum, mean };
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