title: How do {{}} double curly brackets work in dplyr?
body: <p>I saw Hadley's talk at <a href="https://rstudio.com/resources/rstudioconf-2020/state-of-the-tidyverse/" rel="noreferrer">RConf</a> and he mentioned using double brackets for calling variables in tidy evals.</p>
  <p>I searched Google but I couldn't find anything talking about when to use them.</p>
  <p>What's the use case for double brackets in dplyr?</p>