name: duk_has_prop_index

proto: |
  duk_bool_t duk_has_prop_index(duk_context *ctx, duk_idx_t obj_idx, duk_uarridx_t arr_idx);

stack: |
  [ ... obj! ... ] -> [ ... obj! ... ]

summary: |
  <p>Like <code><a href="#duk_has_prop">duk_has_prop()</a></code>,
  but the property name is given as an unsigned integer
  <code>arr_idx</code>.  This is especially useful for checking
  existence of array elements (but is not limited to that).</p>

  <p>Conceptually the number is coerced to a string for property
  existence check, e.g. <code>123</code> would be equivalent to a property
  name <code>"123"</code>.  Duktape avoids an explicit coercion whenever
  possible.</p>

example: |
  if (duk_has_prop_index(ctx, -3, 123)) {
      printf("obj has index 123\n");
  } else {
      printf("obj does not have index 123\n");
  }

tags:
  - property

introduced: 1.0.0