Function JSObjectHasPropertyForKey 

pub unsafe extern "C-unwind" fn JSObjectHasPropertyForKey(
    ctx: JSContextRef,
    object: JSObjectRef,
    property_key: JSValueRef,
    exception: *mut JSValueRef,
) -> bool

Available on crate features JSBase and JSObjectRef only.

Tests whether an object has a given property using a JSValueRef as the property key.

Parameter object: The JSObject to test.

Parameter propertyKey: A JSValueRef containing the property key to use when looking up the property.

Parameter exception: A pointer to a JSValueRef in which to store an exception, if any. Pass NULL if you do not care to store an exception.

Returns: true if the object has a property whose name matches propertyKey, otherwise false.

This function is the same as performing “propertyKey in object” from JavaScript.

Safety

• ctx must be a valid pointer.
• object must be a valid pointer.
• property_key must be a valid pointer.
• exception must be a valid pointer.