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Mastering the IDE: Completion
In Kotlin, it's easy to explore classes using IntelliJ IDEA, which has code completion. IDEA attempts to complete what you're typing and show you a list of options. After you type the dot, IDEA suggests members which can be called on a given element. You can also call completion explicitly by pressing &shortcut:CodeCompletion;.
Use &shortcut:EditorDown; and &shortcut:EditorUp; to select the required member and press &shortcut:EditorEnter; to paste it.
&shortcut:CodeCompletion; discovers all possible operations for a class. You can type the first letters of a member function or property to see all the available members starting with these letters, or simply containing these letters.
Type the identifier name r followed by a dot, then press
&shortcut:CodeCompletion; to see
the possible completions. Choose r.sum() and s.reversed() by typing only
the first letters and using code completion.