AnyDecodable
@frozen
struct AnyDecodable
extension AnyDecodable : CustomDebugStringConvertible, CustomStringConvertible, Decodable, Equatable, Equatable, Hashable, _AnyDecodable
A type-erased Decodable
value.
The AnyDecodable
type forwards decoding responsibilities
to an underlying value, hiding its specific underlying type.
You can decode mixed-type values in dictionaries
and other collections that require Decodable
conformance
by declaring their contained type to be AnyDecodable
:
let json = """
{
"boolean": true,
"integer": 42,
"double": 3.141592653589793,
"string": "string",
"array": [1, 2, 3],
"nested": {
"a": "alpha",
"b": "bravo",
"c": "charlie"
},
"null": null
}
""".data(using: .utf8)!
let decoder = JSONDecoder()
let dictionary = try! decoder.decode([String: AnyDecodable].self, from: json)
-
Undocumented
Declaration
Swift
let value: Any
-
Undocumented
Declaration
Swift
init<T>(_ value: T?)
-
Returns a Boolean value indicating whether two values are equal.
Equality is the inverse of inequality. For any values
a
andb
,a == b
implies thata != b
isfalse
.Declaration
Swift
static func == (lhs: AnyDecodable, rhs: AnyDecodable) -> Bool
Parameters
lhs
A value to compare.
rhs
Another value to compare.
-
A textual representation of this instance.
Calling this property directly is discouraged. Instead, convert an instance of any type to a string by using the
String(describing:)
initializer. This initializer works with any type, and uses the customdescription
property for types that conform toCustomStringConvertible
:struct Point: CustomStringConvertible { let x: Int, y: Int var description: String { return "(\(x), \(y))" } } let p = Point(x: 21, y: 30) let s = String(describing: p) print(s) // Prints "(21, 30)"
The conversion of
p
to a string in the assignment tos
uses thePoint
type’sdescription
property.Declaration
Swift
var description: String { get }
-
A textual representation of this instance, suitable for debugging.
Calling this property directly is discouraged. Instead, convert an instance of any type to a string by using the
String(reflecting:)
initializer. This initializer works with any type, and uses the customdebugDescription
property for types that conform toCustomDebugStringConvertible
:struct Point: CustomDebugStringConvertible { let x: Int, y: Int var debugDescription: String { return "(\(x), \(y))" } } let p = Point(x: 21, y: 30) let s = String(reflecting: p) print(s) // Prints "(21, 30)"
The conversion of
p
to a string in the assignment tos
uses thePoint
type’sdebugDescription
property.Declaration
Swift
var debugDescription: String { get }
-
Hashes the essential components of this value by feeding them into the given hasher.
Implement this method to conform to the
Hashable
protocol. The components used for hashing must be the same as the components compared in your type’s==
operator implementation. Callhasher.combine(_:)
with each of these components.Important
In your implementation of
hash(into:)
, don’t callfinalize()
on thehasher
instance provided, or replace it with a different instance. Doing so may become a compile-time error in the future.Declaration
Swift
func hash(into hasher: inout Hasher)