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Merge pull request #14 from harrismcgehee/patch-1

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Update lists.Rmd
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Hadley Wickham
2015-12-11 11:17:41 -06:00
parent 323477d7e5 15947eca11
commit d7bda8ed2c
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lists.Rmd
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@@ -309,7 +309,7 @@ This pattern of looping over a list and doing something to each element is so co
* `map_chr()` returns a character vector. * `map_chr()` returns a character vector.
* `map_df()` returns a data frame. * `map_df()` returns a data frame.
* `walk()` returns nothing. Walk is a little different to the others because * `walk()` returns nothing. Walk is a little different to the others because
it's called exclusively its side effects, so it's described in more detail it's called exclusively for its side effects, so it's described in more detail
later in [walk](#walk). later in [walk](#walk).
Each functions takes a list as input, applies a function to each piece, and then returns a new vector that's the same length as the input. The type of the vector is determine by the specific map function. Usually you want to use the most specific avaiable; using `map()` only as a fallback when there is no specialised equivalent available. Each functions takes a list as input, applies a function to each piece, and then returns a new vector that's the same length as the input. The type of the vector is determine by the specific map function. Usually you want to use the most specific avaiable; using `map()` only as a fallback when there is no specialised equivalent available.