makeLowerCase.js

/**
 * @nosideeffects
 * @param obj {Object}
 * @param props {string[]}
 * @return {Object}
 */
function makeLowerCase(obj, props) {
  const _obj = { ...obj };
  for (let prop of props) {
    _obj[prop] = obj[prop].toLowerCase();
  }
  return _obj;
}