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Showing content from https://www.mongodb.com/docs/realm-sdks/swift/latest/Classes/ObjectId.html below:

ObjectId Class Reference

ObjectId

@objc(RealmSwiftObjectId)
public final class ObjectId : RLMObjectId, Decodable, @unchecked Sendable

extension ObjectId: Encodable

extension ObjectId: Comparable

extension ObjectId: _RealmCollectionValueInsideOptional

A 12-byte (probably) unique object identifier.

ObjectIds are similar to a GUID or a UUID, and can be used to uniquely identify objects without a centralized ID generator. An ObjectID consists of:

A 4 byte timestamp measuring the creation time of the ObjectId in seconds since the Unix epoch.
A 5 byte random value
A 3 byte counter, initialized to a random value.

ObjectIds are intended to be fast to generate. Sorting by an ObjectId field will typically result in the objects being sorted in creation order.

Creates a new zero-initialized ObjectId.
Declaration
Swift
```
public override required init()
```
Creates a new randomly-initialized ObjectId.
Declaration
Swift
```
public override static func generate() -> ObjectId
```
Creates a new ObjectId from the given 24-byte hexadecimal string.

Throws if the string is not 24 characters or contains any characters other than 0-9a-fA-F.
Declaration
Swift
```
public override required init(string: String) throws
```
Parameters string
The string to parse.
Creates a new ObjectId using the given date, machine identifier, process identifier.
Declaration
Swift
```
public required init(timestamp: Date, machineId: Int, processId: Int)
```
Parameters timestamp
A timestamp as NSDate.
machineId
The machine identifier.
processId
The process identifier.
Creates a new ObjectId from the given 24-byte hexadecimal static string.

Aborts if the string is not 24 characters or contains any characters other than 0-9a-fA-F. Use the initializer which takes a String to handle invalid strings at runtime.
Declaration
Swift
```
public required init(_ str: StaticString)
```
Creates a new ObjectId by decoding from the given decoder.

This initializer throws an error if reading from the decoder fails, or if the data read is corrupted or otherwise invalid.
Declaration
Swift
```
public required init(from decoder: Decoder) throws
```
Parameters decoder
The decoder to read data from.
Encodes this ObjectId into the given encoder.

This function throws an error if the given encoder is unable to encode a string.
Declaration
Swift
```
public func encode(to encoder: Encoder) throws
```
Parameters encoder
The encoder to write data to.
Returns a Boolean value indicating whether the value of the first argument is less than that of the second argument.
Declaration
Swift
```
public static func < (lhs: ObjectId, rhs: ObjectId) -> Bool
```
Parameters lhs
An ObjectId value to compare.
rhs
Another ObjectId value to compare.
Returns a Boolean value indicating whether the ObjectId of the first argument is less than or equal to that of the second argument.
Declaration
Swift
```
public static func <= (lhs: ObjectId, rhs: ObjectId) -> Bool
```
Parameters lhs
An ObjectId value to compare.
rhs
Another ObjectId value to compare.
Returns a Boolean value indicating whether the ObjectId of the first argument is greater than or equal to that of the second argument.
Declaration
Swift
```
public static func >= (lhs: ObjectId, rhs: ObjectId) -> Bool
```
Parameters lhs
An ObjectId value to compare.
rhs
Another ObjectId value to compare.
Returns a Boolean value indicating whether the ObjectId of the first argument is greater than that of the second argument.
Declaration
Swift
```
public static func > (lhs: ObjectId, rhs: ObjectId) -> Bool
```
Parameters lhs
An ObjectId value to compare.
rhs
Another ObjectId value to compare.

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