Object.assign vs Object rest spread

object-assign-vs-rest-spread.js

{
  let options = {
    key1: "val1",
  };
  const optionsDefault = {
    key1: "default-val1",
    key2: "default-val2",
  };
  
  // object rest spread on es7
  options = {...optionsDefault, ...options};
  
  // test
  assert.deepEqual(options, {
    key1: "val1",
    key2: "default-val2",
  });
}
{
  let options = {
    key1: "val1",
  };
  const optionsDefault = {
    key1: "default-val1",
    key2: "default-val2",
  };

  // object asign
  options = Object.assign({}, optionsDefault, options);
  
  // test
  assert.deepEqual(options, {
    key1: "val1",
    key2: "default-val2",
  });
}