Collections - Scripting in Java: Integrating with Groovy and JavaScript - page 230

Stack = 10,20
After push(40), Stack = 10,20,40
After 2 pops, Stack = 10
stack.peek() = 10
stack.isEmpty() = false
After another pop(), stack.isEmpty() = true

Searching an Array
Two methods, indexOf() and lastIndexOf() , let you search an array for a specified
element. Their signatures are:

indexOf(searchElement, fromIndex) •

lastIndexOf(searchElement, fromIndex)
The indexOf() method searches for the specified searchElement in the array
starting at fromIndex . If fromIndex is not specified, 0 is assumed, meaning that the entire
array is searched. The method returns the index of the first element in the array that is
equal to the searchElement using the === operator. If the searchElement is not found, -1
is returned.
The lastIndexOf() method works the same as the indexOf() method, except that it
performs the search from the end to the beginning. That is, it returns the index of the last
found element in the array that is equal to the searchElement . The following code shows
how to use these methods:

•

var ids = [10, 20, 30, 20];
print("ids = " + ids);
print("ids.indexOf(20) = " + ids.indexOf(20));
print("ids.indexOf(20, 2) = " + ids.indexOf(20, 2));
print("ids.lastIndexOf(20) = " + ids.lastIndexOf(20));
print("ids.indexOf(25) = " + ids.lastIndexOf(25));

ids = 10,20,30,20
ids.indexOf(20) = 1
ids.indexOf(20, 2) = 3
ids.lastIndexOf(20) = 3
ids.indexOf(25) = -1