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I just read Google's R Style Guide, and decide to be consist with the letter case in function names and variables. How to change letter case in RStudio's editor? To be specific, how to change words
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To convert an uppercase string to lowercase in R, use the tolower() method. It takes a string as an argument and returns the lowercase version. The tolower() method changes the case of a string to the lower.
To use a keyboard shortcut to change between lowercase, UPPERCASE, and Capitalize Each Word, select the text and press SHIFT + F3 until the case you want is applied.
You can modify a command's shortcut by clicking on the cell containing the current shortcut key sequence, and typing the new sequence you'd like to bind the command to.
Highlight the text you want to uppercase. Then hit CTRL + SHIFT + P to bring up the command palette. Then start typing the word "uppercase", and you'll see the Transform to Uppercase command.
To Lower case you can use the keyboard shortcut Ctrl + Shift + U, To Upper case you can use the keyboard shortcut Ctrl + U
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