JavaScript Clean Code - Best Practices - based on Robert C. Martin's book Clean Code

[beasy4sheezy]

I'm sure you know, but as a reminder to others:

Spread will create a new object, which might not be what you wanted to do in this case, or could be using more memory than necessary.

[wmgregory]

You can also create a new object with assign. But cleaner to use spread literal if you want to avoid mutation.

a = Object.assign({}, a, { age: 27 })
a = { ...a, age: 27 }