Module 4~9 min
Arrays and Lists
Programs often need to work with many related pieces of data at once. Arrays (also called lists) let you group them together.
What You'll Learn
- What an array is
- How items in an array are accessed
- A simple use case for arrays
Grouping Related Data
An array is an ordered collection of values stored under a single variable name, making it easy to work with many related items together instead of one at a time.
Accessing Items by Position
Each item in an array has a position, called an index, usually starting at zero. You can access or change a specific item using its index.
Example
An array of three colors might store ["red", "green", "blue"] -- the first item, "red", would be at index 0.
Key Concepts
ArrayIndexCollection
Key Takeaways
- An array is an ordered collection of values under one variable name
- Each item in an array has a position called an index
- Arrays make it easy to work with many related items together
Knowledge Check
What is an array?