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Call it walrus operator, closes #1591

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Mine Çetinkaya-Rundel
2023-11-09 09:32:17 -05:00
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functions.qmd
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@@ -737,7 +737,7 @@ sorted_bars <- function(df, var) {
diamonds |> sorted_bars(clarity) diamonds |> sorted_bars(clarity)
``` ```
We have to use a new operator here, `:=`, because we are generating the variable name based on user-supplied data. We have to use a new operator here, `:=` (commonly referred to as the "walrus operator"), because we are generating the variable name based on user-supplied data.
Variable names go on the left hand side of `=`, but R's syntax doesn't allow anything to the left of `=` except for a single literal name. Variable names go on the left hand side of `=`, but R's syntax doesn't allow anything to the left of `=` except for a single literal name.
To work around this problem, we use the special operator `:=` which tidy evaluation treats in exactly the same way as `=`. To work around this problem, we use the special operator `:=` which tidy evaluation treats in exactly the same way as `=`.