Nick Jensen wrote:
> I agree that this should be an error. In javascript an empty array is
> truthy, which is a constant source of errors and confusion.
>
> ```javascript
> var arr = [];
> console.log(!!arr); // true
> arr = null;
> console.log(!!arr); // false
> ```
Yes, that's one of the things where Javascript/TypeScript is behaving
counter-intuitively. Let's avoid that.
> I think a type error here would lead to better and more readable code.
As mentioned before, I had been trying to follow TypeScript. But if we
are going to divert anyway, the question comes up if we should follow
TypeScript at all.
Assuming we require a condition to evaluate to a boolean, not a string,
list, etc., the question comes up what to do with "&&" and "||". In
TypeScript it is useful to do something like:
result = computed || 'empty'
If we go back to having "&&" and "||" resulting in true or false, then
we need something else for that. A trinary condition is a bit long:
result = computed ? computed : 'empty'
That can be shortened by introducing a new operator:
result = computed ?: 'empty'
Which is actually better, since here we don't expect "computed" to be a
boolean.
There is less use for this with "&&", "this && that" would always result
in "false" or "that", where "false" could be either the falsy "this" or
the falsy "that", the difference is hardly ever useful.
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