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=proto
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int duk_is_function(duk_context *ctx, int index);
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=stack
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[ ... val! ... ]
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=summary
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<p>Returns 1 if value at <tt>index</tt> is an object and is a function (has the
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internal class <tt>Function</tt>), otherwise returns 0. If <tt>index</tt> is
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invalid, also returns 0.</p>
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<p>This function returns 1 when the following Ecmascript expression is true:</p>
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<pre class="ecmascript-code">
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Object.prototype.toString.call(val) === '[object Function]'
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</pre>
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<p>To determine the specific type of the function, use:</p>
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<ul>
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<li><tt><a href="#duk_is_c_function">duk_is_c_function()</a></tt></li>
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<li><tt><a href="#duk_is_ecmascript_function">duk_is_ecmascript_function()</a></tt></li>
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<li><tt><a href="#duk_is_bound_function">duk_is_bound_function()</a></tt></li>
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</ul>
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=example
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if (duk_is_function(ctx, -3)) {
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/* ... */
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}
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=tags
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stack
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function
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