C-Level Extensibility > The C-level extensibility API > long JS_GetArrayLength()

 

long JS_GetArrayLength()

Description

Given a pointer to an array object, gets the number of elements in the array.

Arguments

JSContext *cx, JSObject *obj

cx is the opaque JSContext pointer that was passed to the JavaScript function.
obj is a reference to an array object.

Returns

The number of elements in the array, or -1 upon failure.