Returns the last index of an element found in the array, searching backwards, starting at fromIndex. A value of -1 is returned if the element is not found.
pub fn array_last_index_of() {
let arr = js_sys::Array::new();
arr.push(&JsValue::from("Jane"));
arr.push(&JsValue::from("John"));
arr.push(&JsValue::from("Jane"));
arr.push(&JsValue::from("James"));
let idx=arr.last_index_of(&JsValue::from("Jane"),1);
web_sys::console::log_2(&"Index Found : %d ".into(),&JsValue::from(idx));
//Index Found : 0
}
pub fn last_index_of(&self, value: &JsValue, from_index: i32) -> i32