Logger

Monday, 17 September 2018

Logger

Hello friends this article is use for developer debugging print values in LLDB debug area.
There are multiple functions available in swift

print(),debugPrint(),dump(),NSLog()

use of these functions in swift

print : print(_ items: Any..., separator: String = default, terminator: String = default)

print is use for some textual representations in debug area. 

example : 

print("hello friends")

Output : 

hello friends

debugPrint : debugPrint(_ items: Any..., separator: String = default, terminator: String = default)

debugPrint is use for shows the instance of some textual representations in debug area.

example : 

debugPrint("hello friends")

Output : 

"hello friends"

dump : dump<T>(_ value: T, name: String? = default, indent: Int = default, maxDepth: Int = default, maxItems: Int = default)

dump is use for print the contents of an object via reflection like mirroring. dump prints details hierarchy

example : 

dump(["iOS","Android"])

Output : 

2 elements
  - "iOS"
  - "Android"

NSLog : NSLog(_ format: String, _ args: CVarArg...)

NSLog is use for print the contents with timestamp. It will also print project_name along with timestamp.

example :

NSLog("hello iOS developers")

Output : 

2018-09-17 15:18:10.522 DebuggerDemo[2022:4583274]hello iOS developers

print() vs dump()

Let’s create simple “Student” class

class Student{
    let name = "Pratik"
    let lname = "Lad"
}

now print Student() class using print() & dump() 

print(Student())

Output :

__lldb_expr_81.Student

dump(Student())

Output : 

__lldb_expr_81.Student #0
  - name: "Pratik"
  - lname: "Lad"

You can see the difference of printing in debug area result. print() simple print the class name where as dump() print the whole class hierarchy. 

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