Non-null assertion operator (aka Swift's force unwrap)

💡 Ideas
11

For example, I would love to see something like this assertion idea go through. It would allow you to do something like TypeError.assert(someCondition). Many languages have some sort of assert function or statement. It would be nice if JavaScript does as well.

I guess someone could utilize the fact that null! will always throw an assertion error, and with a bit of hacking, emulate assertions as follows:

function operateOnArray(array) {
  Array.isArray(array) || null!
  ...
}

But, it would be preferable to just provide a native assert function.

function operateOnArray(array) {
  TypeError.assert(Array.isArray(array))
  ...
}