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

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

import { singleOrArray } from './helpers/singleOrArray.js';
import { everything } from './selectors/everything.js';

function processSelectors(items, selectKeys) {
  let processedSelectKeys = [];
  for (const keyInput of singleOrArray(selectKeys)) {
    if (typeof keyInput === "function") {
      processedSelectKeys.push(...keyInput(items));
    } else {
      processedSelectKeys.push(keyInput);
    }
  }
  if (processedSelectKeys.length && processedSelectKeys[0][0] === "-") {
    processedSelectKeys = [...everything()(items), ...processedSelectKeys];
  }
  const negationMap = {};
  const keysWithoutNegations = [];
  for (let k = processedSelectKeys.length - 1; k >= 0; k--) {
    const key = processedSelectKeys[k];
    if (key[0] === "-") {
      negationMap[key.substring(1)] = true;
      continue;
    }
    if (negationMap[key]) {
      negationMap[key] = false;
      continue;
    }
    keysWithoutNegations.unshift(key);
  }
  processedSelectKeys = Array.from(new Set(keysWithoutNegations));
  return processedSelectKeys;
}
function select(selectKeys) {
  const _select = (items) => {
    let processedSelectKeys = processSelectors(items, selectKeys);
    if (!processedSelectKeys.length)
      return items;
    return items.map((d) => {
      const mapped = {};
      for (const key of processedSelectKeys) {
        mapped[key] = d[key];
      }
      return mapped;
    });
  };
  return _select;
}

export { processSelectors, select };
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