@tidyjs/tidy/dist/es/leftJoin.js

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

import { autodetectByMap, makeByMap, isMatch } from './innerJoin.js';

function leftJoin(itemsToJoin, options) {
  const _leftJoin = (items) => {
    if (!itemsToJoin.length)
      return items;
    const byMap = (options == null ? void 0 : options.by) == null ? autodetectByMap(items, itemsToJoin) : makeByMap(options.by);
    const joinObjectKeys = Object.keys(itemsToJoin[0]);
    const joined = items.flatMap((d) => {
      const matches = itemsToJoin.filter((j) => isMatch(d, j, byMap));
      if (matches.length) {
        return matches.map((j) => ({...d, ...j}));
      }
      const undefinedFill = Object.fromEntries(joinObjectKeys.filter((key) => d[key] == null).map((key) => [key, void 0]));
      return {...d, ...undefinedFill};
    });
    return joined;
  };
  return _leftJoin;
}

export { leftJoin };
//# sourceMappingURL=leftJoin.js.map