EVOLUTION-MANAGER
Edit File: env_cache.html
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd"><html xmlns="http://www.w3.org/1999/xhtml"><head><title>R: Cache a value in an environment</title> <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> <link rel="stylesheet" type="text/css" href="R.css" /> </head><body> <table width="100%" summary="page for env_cache {rlang}"><tr><td>env_cache {rlang}</td><td style="text-align: right;">R Documentation</td></tr></table> <h2>Cache a value in an environment</h2> <h3>Description</h3> <p><code>env_cache()</code> is a wrapper around <code><a href="env_get.html">env_get()</a></code> and <code><a href="env_poke.html">env_poke()</a></code> designed to retrieve a cached value from <code>env</code>. </p> <ul> <li><p> If the <code>nm</code> binding exists, it returns its value. </p> </li> <li><p> Otherwise, it stores the default value in <code>env</code> and returns that. </p> </li></ul> <h3>Usage</h3> <pre> env_cache(env, nm, default) </pre> <h3>Arguments</h3> <table summary="R argblock"> <tr valign="top"><td><code>env</code></td> <td> <p>An environment.</p> </td></tr> <tr valign="top"><td><code>nm</code></td> <td> <p>Name of binding, a string.</p> </td></tr> <tr valign="top"><td><code>default</code></td> <td> <p>The default value to store in <code>env</code> if <code>nm</code> does not exist yet.</p> </td></tr> </table> <h3>Value</h3> <p>Either the value of <code>nm</code> or <code>default</code> if it did not exist yet. </p> <h3>Examples</h3> <pre> e <- env(a = "foo") # Returns existing binding env_cache(e, "a", "default") # Creates a `b` binding and returns its default value env_cache(e, "b", "default") # Now `b` is defined e$b </pre> <hr /><div style="text-align: center;">[Package <em>rlang</em> version 1.0.6 <a href="00Index.html">Index</a>]</div> </body></html>