programming-for-dummies

348
Using a Collection
1 2
Billy Joe 99
3 4
Johnny McGruffin Hal Perkins
Figure 3-2:
You can
insert data
before a
specific
location in
an array.
1
2
Billy Joe 3.14
Adding new data in the middle of a collection
automatically renumbers the rest of the collection.
3 4 5
99 Johnny McGruffin Hal Perkins
This command would insert the name Gini Belkins after the third element
in the collection, as shown in Figure 3-3.
Figure 3-3:
You can
insert new
data after
an existing
location in a
collection.
1 2
Billy Joe 3.14
1
2
Billy Joe 3.14
Gini Belkins
Inserting new data after the third
item in a collection.
3 4 5
99 Johnny McGruffin Hal Perkins
3 4 5 6
99 Gini Belkins Johnny McGruffin Hal Perkins
Don’t worry about the extra spaces between the three commas in the preceding
command:
✦ The first extra space is reserved for using collections with keys (which
you read about later in this chapter).
✦ The second extra space is used to store data before a location in a
collection.
Deleting data from a collection
After you store data in a collection, you can always delete data from that collection.
To delete data, you must specify the location of that data by defining
an index number. So if you want to delete the fourth item in a collection,
you’d specify deleting data stored at index 4 like this:
HitList.Remove (4)