@modern-kit/utils/dist/array/countBy/index.mjs

modern-kit/utils

import { identity } from '../../common/identity/index.mjs';

function countBy(arr, iteratee) {
  const iterateeToUse = iteratee ?? identity;
  const result = {};
  for (let i = 0; i < arr.length; i++) {
    const value = arr[i];
    const key = iterateeToUse(value);
    result[key] = (result[key] || 0) + 1;
  }
  return result;
}

export { countBy };
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