select non existing columns

b-rodrigues · Mar 20, 2020 · 6e2fee1 · 6e2fee1
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diff --git a/04-descriptives.Rmd b/04-descriptives.Rmd
@@ -1564,6 +1564,46 @@ gasoline %>%
   select(starts_with("l"))
 ```
 
+Another very neat trick is selecting columns that may or may not exist in your data frame. For this quick examples
+let's use the `mtcars` dataset:
+
+```{r}
+sort(colnames(mtcars))
+```
+
+Let's create a vector with some column names:
+
+```{r}
+cols_to_select <- c("mpg", "cyl", "am", "nonsense")
+```
+
+The following selects the columns that exist
+in the data frame but shows a warning for the column that does not exist:
+
+```{r}
+mtcars %>%
+  select(one_of(cols_to_select))
+```
+
+If you don't want a warning to show, use `any_of()` insetad:
+
+```{r}
+mtcars %>%
+  select(any_of(cols_to_select))
+```
+
+and finally, if you want it to fail, don't use any helper:
+
+```{r, eval = FALSE}
+mtcars %>%
+  select(cols_to_select)
+```
+
+```
+Error: Can't subset columns that don't exist.
+The column `nonsense` doesn't exist.
+```
+
 Bulk-renaming can be achieved using `rename_with()`
 
 ```{r}

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@@ -24,7 +24,7 @@
 <meta name="author" content="Bruno Rodrigues" />
 
 
-<meta name="date" content="2020-03-18" />
+<meta name="date" content="2020-03-20" />
 
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diff --git a/docs/getting-to-know-rstudio.html b/docs/getting-to-know-rstudio.html
@@ -24,7 +24,7 @@
 <meta name="author" content="Bruno Rodrigues" />
 
 
-<meta name="date" content="2020-03-18" />
+<meta name="date" content="2020-03-20" />
 
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@@ -24,7 +24,7 @@
 <meta name="author" content="Bruno Rodrigues" />
 
 
-<meta name="date" content="2020-03-18" />
+<meta name="date" content="2020-03-20" />
 
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@@ -376,7 +376,7 @@ <h1>
 <div id="header">
 <h1 class="title">Modern R with the tidyverse</h1>
 <p class="author"><em>Bruno Rodrigues</em></p>
-<p class="date"><em>2020-03-18</em></p>
+<p class="date"><em>2020-03-20</em></p>
 </div>
 <div id="preface" class="section level1 unnumbered">
 <h1>Preface</h1>

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@@ -24,7 +24,7 @@
 <meta name="author" content="Bruno Rodrigues" />
 
 
-<meta name="date" content="2020-03-18" />
+<meta name="date" content="2020-03-20" />
 
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@@ -24,7 +24,7 @@
 <meta name="author" content="Bruno Rodrigues" />
 
 
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@@ -24,7 +24,7 @@
 <meta name="author" content="Bruno Rodrigues" />
 
 
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