Swift: print() vs println() vs NSLog()

A few differences:

1. print vs println:

The print function prints messages in the Xcode console when debugging apps.

The println is a variation of this that was removed in Swift 2 and is not used any more. If you see old code that is using println, you can now safely replace it with print.

Back in Swift 1.x, print didn't add newline characters at the end of the printed string, whereas println did. But nowadays, print always adds the newline character at the end of the string, and if you don't want it to do that, supply a terminator parameter of "".

2 NSLog

• NSLog is slower;
• NSLog adds a timestamp and identifier to the output, whereas print will not;
• NSLog statements appear in both the device's console and debugger's console whereas print only appears in the debugger console.
• NSLog uses printf-style format strings, e.g.
• NSLog("%0.4f", CGFloat.pi)
• that will produce:

2017–06–09 11:57:55.642328–0700 MyApp[28937:1751492] 3.1416

For more about iOS development : https://medium.com/@javedmultani16

Some useful codes and libraries: https://github.com/javedmultani16

Know more about me: https://www.linkedin.com/in/javedmultani16/