Swift Resource Library--development tool Playground

Playground is better than being able to write code while you see the value of the output constant variable. You do not need to run the emulator.

Let's try out the use of the tool.

Open the Xcode6 development tool and select Get started with a playground.

The following figure shows a playground program run interface, where the ① area is the code authoring area, the ② area is the run result area, and the ③ area is the timeline (timeline) area. The timeline allows you to see the results of the program running from top to bottom, and the results of running at different time periods can be presented to developers through text, graphs, and graph charts.

Playground interface

This feature allows you to enter code while you see the value of a constant or variable.

Save As Swiftplayground.playground, click Create to enter the editor.