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Is there a keyboard shortcut for adding type definitions to Scala declarations in IntelliJ ? I cannot find any. I can find the tooltip though, but a shortcut would be nicer.
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Single-line comments in Java start with two forward slashes ( // ). To quickly add a line comment in IntelliJ IDEA, press ⌘ / on macOS or Ctrl + / on Windows and Linux.
In IntelliJ IDEA, you can identify the type of an expression in the following way: Place the caret at the necessary code element and press Ctrl+Shift+P (or select View | Type Info from the main menu).
On the Project pane on the left, right-click src and select New => Scala class. If you don't see Scala class, right-click on HelloWorld and click on Add Framework Support…, select Scala and proceed. If you see Error: library is not specified, you can either click download button, or select the library path manually.
Unfortunately, no. The best option is as @pamu explained. Move your cursor to the variable or function declaration, type ALT+ENTER, and select "Add type annotation to definition" in the menu. You can still avoid the mouse by navigating with the down arrow and selecting with enter.
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