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

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

import { processSelectors } from './select.js';

function pivotLonger(options) {
  const _pivotLonger = (items) => {
    var _a;
    const {namesTo, valuesTo, namesSep = "_"} = options;
    const cols = (_a = options.cols) != null ? _a : [];
    const colsKeys = processSelectors(items, cols);
    const namesToKeys = Array.isArray(namesTo) ? namesTo : [namesTo];
    const valuesToKeys = Array.isArray(valuesTo) ? valuesTo : [valuesTo];
    const hasMultipleNamesTo = namesToKeys.length > 1;
    const hasMultipleValuesTo = valuesToKeys.length > 1;
    const longer = [];
    for (const item of items) {
      const remainingKeys = Object.keys(item).filter((key) => !colsKeys.includes(key));
      const baseObj = {};
      for (const key of remainingKeys) {
        baseObj[key] = item[key];
      }
      const nameValueKeysWithoutValuePrefix = hasMultipleValuesTo ? Array.from(new Set(colsKeys.map((key) => key.substring(key.indexOf(namesSep) + 1)))) : colsKeys;
      for (const nameValue of nameValueKeysWithoutValuePrefix) {
        const entryObj = {...baseObj};
        for (const valueKey of valuesToKeys) {
          const itemKey = hasMultipleValuesTo ? `${valueKey}${namesSep}${nameValue}` : nameValue;
          const nameValueParts = hasMultipleNamesTo ? nameValue.split(namesSep) : [nameValue];
          let i = 0;
          for (const nameKey of namesToKeys) {
            const nameValuePart = nameValueParts[i++];
            entryObj[nameKey] = nameValuePart;
            entryObj[valueKey] = item[itemKey];
          }
        }
        longer.push(entryObj);
      }
    }
    return longer;
  };
  return _pivotLonger;
}

export { pivotLonger };
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