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name: duk_is_nan
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proto: |
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duk_bool_t duk_is_nan(duk_context *ctx, duk_idx_t index);
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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>index</code> is a <code>NaN</code> (a special
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number value), otherwise returns 0. If <code>index</code> is invalid,
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also returns 0.</p>
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<p>IEEE has a large number of different <code>NaN</code> values. Duktape
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normalizes <code>NaN</code> values internally. This function returns 1
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for any kind of a <code>NaN</code>.</p>
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example: |
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if (duk_is_nan(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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