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=proto
int duk_is_bound_function(duk_context *ctx, int index);
=stack
[ ... val! ... ]
=summary
<p>Returns 1 if value at <code>index</code> is a Function object which has
been created with Ecmascript <code>Function.prototype.bind()</code>,
otherwise returns 0. If <code>index</code> is invalid, also returns 0.</p>
<p>Bound functions are an Ecmascript concept: they point to a target
function and supply a <code>this</code> binding and zero or more argument
bindings. See
<a href="http://www.ecma-international.org/ecma-262/5.1/#sec-15.3.4.5">Function.prototype.bind (thisArg [, arg1 [, arg2, ...]])</a>.
</p>
=example
if (duk_is_bound_function(ctx, -3)) {
/* ... */
}
=tags
stack
function