Writes the textual representations of the given items most suitable for debugging into the standard output.
SDK
- Xcode 7.0+
Framework
- Swift Standard Library
Declaration
Parameters
itemsZero or more items to print.
separatorA string to print between each item. The default is a single space (
" ").terminatorThe string to print after all items have been printed. The default is a newline (
"\n").
Discussion
You can pass zero or more items to the debug function. The textual representation for each item is the same as that obtained by calling String(reflecting: item). The following example prints the debugging representation of a string, a closed range of integers, and a group of floating-point values to standard output:
debugPrint("One two three four five")
// Prints "One two three four five"
debugPrint(1...5)
// Prints "ClosedRange(1...5)"
debugPrint(1.0, 2.0, 3.0, 4.0, 5.0)
// Prints "1.0 2.0 3.0 4.0 5.0"
To print the items separated by something other than a space, pass a string as separator.
debugPrint(1.0, 2.0, 3.0, 4.0, 5.0, separator: " ... ")
// Prints "1.0 ... 2.0 ... 3.0 ... 4.0 ... 5.0"
The output from each call to debug includes a newline by default. To print the items without a trailing newline, pass an empty string as terminator.
for n in 1...5 {
debugPrint(n, terminator: "")
}
// Prints "12345"