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24 lines
602 B
24 lines
602 B
name: duk_is_null_or_undefined
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proto: |
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duk_bool_t duk_is_null_or_undefined(duk_context *ctx, duk_idx_t idx);
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stack: |
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[ ... val! ... ]
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summary: |
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<p>Returns 1 if value at <code>idx</code> is either <code>null</code> or <code>undefined</code>,
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otherwise returns 0. If <code>idx</code> is invalid, also returns 0.</p>
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<p>This API call is similar to a <code>(x == null)</code> comparison in ECMAScript, which
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is true for both <code>null</code> and <code>undefined</code>.</p>
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example: |
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if (duk_is_null_or_undefined(ctx, -3)) {
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/* ... */
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}
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tags:
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- stack
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introduced: 1.0.0
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