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

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

'use strict';

Object.defineProperty(exports, '__esModule', { value: true });

var d3Array = require('d3-array');

function fcumsum(items, accessor) {
  let sum = new d3Array.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 ? d3Array.fsum(items, accessor) / n : void 0;
}

exports.fcumsum = fcumsum;
exports.mean = mean;
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