Obsolete since JSAPI 19
This feature is obsolete. Although it may still work in some browsers, its use is discouraged since it could be removed at any time. Try to avoid using it.
Retrieve the function flags of a given JavaScript function.
Syntax
unsigned int JS_GetFunctionFlags(JSFunction *fun);
| Name | Type | Description |
|---|---|---|
fun |
JSFunction * |
The function to examine. |
Description
JS_GetFunctionFlags retrieves the function flags of a given JavaScript function, fun. These flags are for the JavaScript engine’s internal use. Most applications can’t do anything useful with them.
Function flags are a value of type unsigned int, the bitwise OR of zero or more of the JSFUN flags described below. Once a function is created, its flags cannot be modified.
JSFUN_GENERIC_NATIVE-
The function is an
Arraygeneric, such asArray.map. JSFUN_HEAVYWEIGHT-
The function uses language features such as closures,
with, orevalthat require extra work on the part of the interpreter. JSFUN_LAMBDA-
The function is a JavaScript function written as a FunctionExpression rather than a FunctionDeclaration, a syntactic distinction. See ECMA 262-3 §13.
JSFUN_CONSTRUCTOR-
The function is native can be used as a constructor with the
newkeyword. (The meaning of this flag may change.)