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Filename : groupBy.js

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'use strict';

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

/**
 * Groups array items into a Map, given a function to produce grouping key.
 */
function groupBy(list, keyFn) {
  const result = new Map();

  for (const item of list) {
    const key = keyFn(item);
    const group = result.get(key);

    if (group === undefined) {
      result.set(key, [item]);
    } else {
      group.push(item);
    }
  }

  return result;
}