name: duk_get_error_code

proto: |

duk_errcode_t duk_get_error_code(duk_context *ctx, duk_idx_t idx);

stack: |

[ ... val! ... ]

summary: |

<p>Map the value at <code>idx</code> to the error codes <code>DUK_ERR_xxx</code>

based on which <code>Error</code> subclass the value inherits from. For example,

if the value at the stack top is an user-defined error which inherits from

<code>ReferenceError</code>, the return value will be <code>DUK_ERR_REFERENCE_ERROR</code>.

If the value inherits from <code>Error</code> but doesn't inherit from any of

the standard subclasses (EvalError, RangeError, ReferenceError, SyntaxError,

TypeError, URIError) <code>DUK_ERR_ERROR</code> is returned.

If the value is not an object, does not inherit from <code>Error</code>, or

<code>idx</code> is invalid, returns 0 (= <code>DUK_ERR_NONE</code>).</p>

example: |

if (duk_get_error_code(ctx, -3) == DUK_ERR_URI_ERROR) {

printf("Invalid URI\n");

}

tags:

- stack

- error

introduced: 1.1.0