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Step 14: Drag the ‘splash’ block from ‘Game’, and add ‘join’ block. In join block, write ‘Sum
of array is:’ in first part and in second part drag and drop ‘y’ variable.
Step 15: Move the ‘splash’ block to ‘on start’ block. Click on the ‘Start the simulator’ button,
and the output is:
Well done, you have learned to calculate the sum of the elements in an array!
Coding fact
Mark Zuckerburg, the most well-known computer scientists and the founder
of “Facebook”, is credited with his influence over the way you use social media
today.
HOW CAN WE ITERATE OVER COLLECTIONS?
Collections contains lists, sets, or maps. There is a lot of data which you can store in
collections and as per the program requirement you can perform modifications on the
stored data.
To perform the modification operation, you need to iterate or traverse the data which is
stored in these collections.
You can iterate or traverse through the elements of collection in a sequential manner.
You need to traverse through the elements of collections to fetch the data or make any
modifications.
MODIFYING COLLECTIONS
You cannot modify every collection as there is a limitation on what can be modified in a
collection.
Understanding Arrays & Collections 67

