Today I Learned

Conditionally add properties to objects in JavaScript

This comes in handy when you want to completely omit a property from an object in case the value is undefined or null.

{prop1, prop2, ...(condition && prop3)}

The trick being here:

...(condition && prop3)

In case the condition evaluates to false, the property will be completely omitted from the object, otherwise, both the value and its corresponding key will show up in the end result.