The problem is that when the type is inferred, then the type of o is: That’s not the same as { dic: { [name: string]: number } }. Critically, with the top signature you’re not allowed to do something like o.dic[‘x’] = 1. With the 2nd signature you are. They are equivalent types at runtime (indeed, they’re the exact … Read more
As simple as that. Basically you don’t need it if the variable is int.
Converting Int to String: And the other way around – converting String to Int: Or if you’re using Swift 2 or 3:
Here’s a rundown on static_cast<> and dynamic_cast<> specifically as they pertain to pointers. This is just a 101-level rundown, it does not cover all the intricacies. static_cast< Type* >(ptr) This takes the pointer in ptr and tries to safely cast it to a pointer of type Type*. This cast is done at compile time. It will only perform the cast if the types … Read more
You don’t typically need to do this, since PHP will coerce the type for you in most circumstances. For situations where you do want to explicitly convert the type, cast it:
Straight from the API Specifications for the ClassCastException: Thrown to indicate that the code has attempted to cast an object to a subclass of which it is not an instance. So, for example, when one tries to cast an Integer to a String, String is not an subclass of Integer, so a ClassCastException will be thrown.