How to check if `Any(not Any?)` is nil or not in swift

Using if case:

You can use if case Optional<Any>.none = a to test if a is nil:

var b: Bool?
var a = b as Any
if case Optional<Any>.none = a {
    print("nil")
} else {
    print("not nil")
}

nil

b = true
a = b as Any
if case Optional<Any>.none = a {
    print("nil")
} else {
    print("not nil")
}

not nil

Using switch:

You can use the pattern test with switch as well:

var b: Bool?
var a = b as Any

switch a {
case Optional<Any>.none:
    print("nil")
default:
    print("not nil")
}

nil

Related