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25 lines
740 B
25 lines
740 B
=proto
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duk_bool_t duk_to_boolean(duk_context *ctx, duk_idx_t index);
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=stack
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[ ... val! ... ] -> [ ... ToBoolean(val)! ... ]
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=summary
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<p>Replace the value at <code>index</code> with an Ecmascript
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<a href="http://www.ecma-international.org/ecma-262/5.1/#sec-9.2">ToBoolean()</a>
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coerced value. Returns 1 if the result of the coercion <code>true</code>, 0 otherwise.
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If <code>index</code> is invalid, throws an error.</p>
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<p>Custom type coercion:</p>
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<ul>
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<li>Buffer: <code>false</code> for zero-size buffer, <code>true</code> otherwise</li>
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<li>Pointer: <code>false</code> for <code>NULL</code> pointer, <code>true</code> otherwise</li>
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</ul>
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=example
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if (duk_to_boolean(ctx, -3)) {
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printf("coerced value is true\n");
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}
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=tags
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stack
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