Module-Data-Groups/Sprint-2/implement/querystring.js at e4288da17430ac7dcd4940ca0f216bbb1198c8a5 · CodeYourFuture/Module-Data-Groups · GitHub

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function parseQueryString(queryString) {
  const queryParams = {};
  if (queryString.length === 0) {
    return queryParams;
  }
  const keyValuePairs = queryString.split("&");

  for (const pair of keyValuePairs) {
    let key = "",
      value = "";
    let equalSignIndex = pair.indexOf("=");

    if (equalSignIndex === -1) {
      key = pair;
      value = "";
    } else {
      key = pair.slice(0, equalSignIndex);
      value = pair.slice(equalSignIndex + 1);
    }

    const existingKeys = Object.keys(queryParams);
    if (key === "" && value === "") continue;
    if (existingKeys.includes(key)) {
      if (queryParams[key] === value) continue;
      if (Array.isArray(queryParams[key])) {
        queryParams[key].push(value);
      } else {
        const temp = queryParams[key];
        queryParams[key] = [temp, value];
      }
    } else queryParams[key] = value;
  }

  return queryParams;
}

module.exports = parseQueryString;