This guide is now superseded by more recent efforts at documenting tidy evaluation in a user-friendly way. We now recommend reading:
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The new Programming with dplyr vignette.
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The Using ggplot2 in packages vignette.
We are keeping this bookdown guide online for posterity, but please know that it is missing a lot of advances that make tidy eval more palatable, such as the embracing operator {{ arg }} and glue support for custom names.