Data Science Desktop Survival Guide by Graham Williams
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Case Conversion

20180606 Often during data transformations strings have to be converted from one case to the other. These simple transformations can be achieved by base::tolower() and base::toupper(). The base::casefold() function can also be used as a wrapper to the two functions.

toupper("String Manipulation")

## [1] "STRING MANIPULATION"

tolower("String Manipulation")

## [1] "string manipulation"

casefold("String Manipulation")

## [1] "string manipulation"

casefold("String Manipulation", upper=TRUE)

## [1] "STRING MANIPULATION"