typedash/dist/sum/index.cjs

modern, type-safe collection of utility functions

'use strict';

// src/functions/sum/sum.ts
function sum(array, mapper) {
  if (array == null) {
    return 0;
  }
  const numbers = array.map((value, index, array_) => {
    const result = mapper?.(value, index, array_) ?? // if there's no iteratee, we're in the overload of `sum` that only takes an array of numbers
    (value ?? 0);
    return result;
  });
  return numbers.reduce((draft, value) => draft + value, 0);
}

exports.sum = sum;
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