Typescript conversion to boolean

Question

In Typescript I can do this:

var xxx : some_type;

if (xxx)
    foo();
else
    bar();

Here xxx will be treated as a boolean, regardless of its

Answer 1

While you can't cast a number directly to a boolean, you can cast it to the wrapper Boolean class and immediately unwrap it. For example:

foo(xxx);

While clumsy, it avoids the type erasure of casting to . It's also arguably less obscure & more readable than the !! approach (certainly so in the transpiled js code).