JS DeleteElement2

From MDC

Remove a specified numeric property from an object.

Contents 1 Syntax 2 Description 2.1 Notes 3 See Also

[edit] Syntax

JSBool JS_DeleteElement2(JSContext *cx, JSObject *obj,
    jsint index, jsval *rval);

Name	Type	Description
cx	JSContext *	The context in which to delete the property. Requires request. (In a JS_THREADSAFE build, the caller must be in a request on this JSContext.)
obj	JSObject *	The object from which to delete the property.
index	jsint	Index of the property to delete.
rval	jsval *	Out parameter. On success, *rval receives the stored value of the deleted property. (???)

[edit] Description

JS_DeleteElement2 removes a specified numeric property, index, from an object, obj. If rval is non-null, the final stored value of the deleted property is stored in *rval. If obj inherits the specified property from a prototype, the property is removed from the object, but not from the prototype. If deletion is successful, JS_DeleteElement2 returns JS_TRUE. Otherwise it returns JS_FALSE.

[edit] Notes

Per the ECMA standard, JS_DeleteElement2 removes read-only properties from objects as long as they are not also permanent.

For JavaScript 1.2 and earlier, if deletion fails because the property is permanent, JS_DeleteElement2 reports the error and returns JS_FALSE. For JavaScript 1.3, the attempt is silently ignored. In both these cases, *rval will receive the stored value of the property that was not deleted.

To remove all properties from an object, call JS_ClearScope.

[edit] See Also

LXR ID Search for JS_DeleteElement2

JS_DefineElement, JS_DeleteElement, JS_GetArrayLength, JS_GetElement, JS_IsArrayObject, JS_LookupElement, JS_NewArrayObject, JS_SetArrayLength, JS_SetElement