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<!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: Check a function has specified arguments</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 has_args {assertthat}"><tr><td>has_args {assertthat}</td><td style="text-align: right;">R Documentation</td></tr></table> <h2>Check a function has specified arguments</h2> <h3>Description</h3> <p>Check a function has specified arguments </p> <h3>Usage</h3> <pre> has_args(f, args, exact = FALSE) f %has_args% args </pre> <h3>Arguments</h3> <table summary="R argblock"> <tr valign="top"><td><code>f</code></td> <td> <p>a function</p> </td></tr> <tr valign="top"><td><code>args</code></td> <td> <p>a character vector of argument names</p> </td></tr> <tr valign="top"><td><code>exact</code></td> <td> <p>if <code>TRUE</code>, argument names must match <code>args</code> exactly (order and value); otherwise <code>f</code> just must have at least <code>args</code> in any order</p> </td></tr> </table> <h3>Examples</h3> <pre> has_args(mean, "x") has_args(mean, "x", exact = TRUE) see_if(mean %has_args% "x") see_if(mean %has_args% "y") </pre> <hr /><div style="text-align: center;">[Package <em>assertthat</em> version 0.2.1 <a href="00Index.html">Index</a>]</div> </body></html>