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20 lines
401 B
20 lines
401 B
=proto
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void duk_require_undefined(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>Throw an error if the value at <code>index</code> is not <code>undefined</code>
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or if the index is invalid.</p>
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<div class="note">
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There is no "get" primitive (<code>duk_get_undefined()</code>) because such a
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function would be a no-op.
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</div>
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=example
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duk_require_undefined(ctx, -3);
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=tags
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stack
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