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35 lines
1.2 KiB
35 lines
1.2 KiB
name: duk_next
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proto: |
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duk_bool_t duk_next(duk_context *ctx, duk_idx_t enum_idx, duk_bool_t get_value);
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stack: |
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[ ... enum! ... ] -> [ ... enum! ... ] (if enum empty; function returns zero)
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[ ... enum! ... ] -> [ ... enum! ... key! ] (if enum not empty and get_value == 0; function returns non-zero)
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[ ... enum! ... ] -> [ ... enum! ... key! value! ] (if enum not empty and get_value != 0; function returns non-zero)
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summary: |
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<p>Get the next key (and optionally value) from an enumerator created with
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<code><a href="#duk_enum">duk_enum()</a></code>. If the enumeration has been
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exhausted, nothing is pushed to the stack and the function returns zero.
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Otherwise the key is pushed to the stack, followed by the value if
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<code>get_value</code> is non-zero, and the function returns non-zero.
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</p>
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<p>Note that getting the value may invoke a getter or trigger a Proxy trap
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which may have arbitrary side effects (and may throw an error).</p>
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example: |
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while (duk_next(ctx, enum_idx, 1)) {
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printf("key=%s, value=%s\n", duk_to_string(ctx, -2), duk_to_string(ctx, -1));
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duk_pop_2(ctx);
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}
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tags:
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- object
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- property
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seealso:
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- duk_enum
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introduced: 1.0.0
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