omit.js

function omit(object, fields) {
  const shallowObject = Object.assign({}, object);
  if (typeof fields === Array) {
    fields.forEach(field => {
      if (!!shallowObject[field]) delete shallowObject[field];
    });
    return shallowObject;
  } else if (typeof fields === "string") return delete shallowObject[fields];
  else throw new Error(`fields ${fields} must be array or string`);
}