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    <h1>Conditional update of columns in data.table</h1>
    <small class="dont-index">Source: <a href="https://github.com/hope-data-science/tidyfst/blob/HEAD/R/mutate_when.R" class="external-link"><code>R/mutate_when.R</code></a></small>
    <div class="hidden name"><code>mutate_vars.Rd</cod