Realm.write() valid syntax

realm_write_syntax.swift

import RealmSwift

// Swift's syntax allows for a variety of ways to invoke closures.
// Here are some of them, specifically ways to making write transactions in Realm Swift.
// See https://realm.io/docs/swift/latest/#writes for Realm's docs on write transactions.

do {
    let realm = try Realm()

    // 1
    realm.beginWrite()
    try realm.commitWrite()

    // 2
    try realm.write {

    }

    // 3
    try realm.write() {

    }

    // 4
    try realm.write({

    })

    // 5: these closure arguments can be included in all other closure syntaxes as well
    try realm.write { () -> () in

    }
} catch {
    // handle error
}