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

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

function autodetectByMap(itemsA, itemsB) {
  if (itemsA.length === 0 || itemsB.length === 0)
    return {};
  const keysA = Object.keys(itemsA[0]);
  const keysB = Object.keys(itemsB[0]);
  const byMap = {};
  for (const key of keysA) {
    if (keysB.includes(key)) {
      byMap[key] = key;
    }
  }
  return byMap;
}
function makeByMap(by) {
  if (Array.isArray(by)) {
    const byMap = {};
    for (const key of by) {
      byMap[key] = key;
    }
    return byMap;
  } else if (typeof by === "object") {
    return by;
  }
  return {[by]: by};
}
function isMatch(d, j, byMap) {
  for (const jKey in byMap) {
    const dKey = byMap[jKey];
    if (d[dKey] !== j[jKey]) {
      return false;
    }
  }
  return true;
}
function innerJoin(itemsToJoin, options) {
  const _innerJoin = (items) => {
    const byMap = (options == null ? void 0 : options.by) == null ? autodetectByMap(items, itemsToJoin) : makeByMap(options.by);
    const joined = items.flatMap((d) => {
      const matches = itemsToJoin.filter((j) => isMatch(d, j, byMap));
      return matches.map((j) => ({...d, ...j}));
    });
    return joined;
  };
  return _innerJoin;
}

export { autodetectByMap, innerJoin, isMatch, makeByMap };
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