Array

The Concept

A collection data structure often consisting of a of elements of the same type, each identified by an array index. The simplest type of array is a linear (one-dimensional) array.

What to cover

Tell a student what an array is in your language, how an array can be manipulated, and ensure they understand where to look for docs on arrays.

• Explain what arrays are in your language? Are the arrays fixed sized or not? Can an array contain elements of different types?
• How to access an array element? What is the syntax for accessing an array element? Where do indexes start from in your language?
• How to create an array? What is the syntax for creating a new array?
• How to add or remove elements from an array? What is the syntax for various manipulations of an array?

Exercises

Elyses Enchantments (Stack of cards)

This exercise deals with manipulating a stack of playing cards. The reference implementation (JavaScript) teaches:

• Create an array
• Accessing an element from an array
• Changing an element from an array
• Deleting an element from an array
• Adding an element to an array
• Using the length of an array

Implementations

Track	Exercise	Changes
JavaScript	arrays	None

Elyses Analytical Enchantments (Stack of cards)

This exercise deals with analysis on a stack of playing cards. The reference implementation (JavaScript) teaches:

• Find the index of an item in an array
• Find the index of an item matching a predicate in an array
• Test a predicate against all items in an array
  • short-circuit on one true (some)
  • short-circuit on one false (every)

Implementations

Track	Exercise	Changes
JavaScript	arrays	None

Garden bird count

This exercise has one working with garden bird counts. The reference implementation (C#) teaches:

• Define an array
• Access an element in an array
• Update an element in an array
• Use functions on an array

Implementations

Track	Exercise	Changes
C#	[arrays][implementation-csharp]	None
F#	[arrays][implementation-fsharp]	Replace looping task with pattern matching