Object Cloning (Object.assign) Comparison

const a = { 
  stringField: 'Joe',
  nestedField: {field: 'Nested'},
  functionField: () => 'aReturn'
};
const b = Object.assign({}, a);
b.stringField = 'Bob';
b.nestedField.field = 'Changed';
b.functionField = () => 'bReturn';
console.log(
  a.stringField,
  a.nestedField.field,
  a.functionField()
);