name: duk_to_undefined

proto: |
  void duk_to_undefined(duk_context *ctx, duk_idx_t index);

stack: |
  [ ... val! ... ] -> [ ... undefined! ... ]

summary: |
  <p>Replace the value at <code>index</code> with <code>undefined</code>, regardless
  of the previous value.  Throws an error if index is invalid.</p>

  <div class="note">
  Equivalent to <code>duk_push_undefined()</code> followed by <code>duk_replace()</code>
  to target index.
  </div>

example: |
  duk_to_undefined(ctx, -3);

tags:
  - stack

introduced: 1.0.0