Alternative to the spread operator.

TLDR: Object.assign(object, object)

I was doing some work on a serverless function and I didn't have ES6 support so I had to figure out how to supplement the spread operator. Below is an example of the spread operator with some objects that hold some food.

const moreFood = {'pizza': '🍕', 'steak': '🥩',}const food = { 'chocolate': '🍫', 'icecream': '🍦', 'pizza': 'pizza', ...moreFood }//results{'chocolate': '🍫', 'icecream': '🍦','pizza': '🍕','steak': '🥩',}

One of the alternatives to the spread operator is the Object.assign function. Here is the same function using the object.assign function.

const moreFood = {'pizza': '🍕', 'steak': '🥩',}const food = { 'chocolate': '🍫', 'icecream': '🍦', 'pizza': 'pizza' }Object.assign(food, moreFood)//results{'chocolate': '🍫', 'icecream': '🍦','pizza': '🍕','steak': '🥩',}

Side note:

If there is a duplicate key like in the example with pizza both the spread operator and the Object.assign function both will take what the right objects says pizza is.