Swift Language Logging in Swift Debug Print
Example
Debug Print shows the instance representation that is most suitable for debugging.
print("Hello")
debugPrint("Hello")
let dict = ["foo": 1, "bar": 2]
print(dict)
debugPrint(dict)
Yields
>>> Hello
>>> "Hello"
>>> [foo: 1, bar: 2]
>>> ["foo": 1, "bar": 2]
This extra information can be very important, for example:
let wordArray = ["foo", "bar", "food, bars"]
print(wordArray)
debugPrint(wordArray)
Yields
>>> [foo, bar, food, bars]
>>> ["foo", "bar", "food, bars"]
Notice how in the first output it appears that there are 4 elements in the array as opposed to 3. For reasons like this, it is preferable when debugging to use debugPrint
Updating a classes debug and print values
struct Foo: Printable, DebugPrintable {
var description: String {return "Clear description of the object"}
var debugDescription: String {return "Helpful message for debugging"}
}
var foo = Foo()
print(foo)
debugPrint(foo)
>>> Clear description of the object
>>> Helpful message for debugging
