Have you ever used
|| to set a default value if a variable was null or undefined?
For example, like this:
const myColor = color || 'red'
Well, nullish coalescing is going to replace
|| in there:
const myColor = color ?? 'red'
Well, there is a whole range of bugs that hide underneath the surface when using
|| to provide a fallback value.
|| handles values as falsy.
?? handles values as nullish (hence the name).
Which means that with
|| the second operand is evaluated if the first operand is
?? on the other hand limits this list to only
Which might suit your use case better!
The v8.dev blog has a much more detailed post on this operator, but you got the gist here.
It’s currently available in Chrome Canary, and in Babel!
Check my Babel guide