capitalizeName - Version 2

capitalizeName.ts

export const capitalizeName = (obj: object): object => {

  if (!obj) {
    throw new Error('object is null or undefined');
  }

  if (!('name' in obj)) {
    return Object.assign(obj, {name: ''});
  }

  if (typeof obj['name'] !== 'string') {
    throw new Error("'name' key in object must be a string.");
  }

  const newObject = Object.assign({}, obj, { name: obj['name'].toUpperCase() });
  return newObject;

}