Exercise 7: R string processing

Find a function `FUN` that leads to the following output:

``FUN("mile")``
``## [1] "e" "i" "l" "m"``
``FUN("lime")``
``## [1] "e" "i" "l" "m"``
``FUN("camel")``
``## [1] "a" "c" "e" "l" "m"``
``FUN(paste(sample(letters), collapse = ""))``
``````##  [1] "a" "b" "c" "d" "e" "f" "g" "h" "i" "j" "k" "l" "m"
## [14] "n" "o" "p" "q" "r" "s" "t" "u" "v" "w" "x" "y" "z"``````

Hint: aim to keep the answer simple. The main logic of the function can often be summarized in a single line of R code.

Answer: click to reveal

We can write the function as follows:

``````  FUN <- function(x) {
return(sort(strsplit(x, split = "")[[1]]))
}``````

This function splits the input string into single characters and then performs an alphabetical sort. For example:

``````  x <- "camel"
strsplit(x, split = "")``````
``````  ## [[1]]
## [1] "c" "a" "m" "e" "l"``````
``  sort(strsplit(x, split = "")[[1]])``
``  ## [1] "a" "c" "e" "l" "m"``

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