freeCodeCamp/guide/english/miscellaneous/learn-about-ruby-arrays/index.md

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Learn About Ruby Arrays

Basics:

• Arrays are a list of indexed items stored inside <a href='http://ruby-doc.org/core-2.2.0/Array.html' target='_blank' rel='nofollow'>] brackets.
• Ruby uses zero-based indexing. This means the first item in the array is stored in index number 0, then the second is at index number 1, and so on incrementing by values of 1 for each additional item stored in the array.
• Arrays can be created using [] or Array.new syntax.
• Ruby has many build in methods to perform operations on arrays such as reversing or finding an element stored in the array.

Examples:

arr = [1,2,3]
# is equivalent to:
arr = Array.new(3)
arr[0] = 1
arr[1] = 2
arr[2] = 3
# is also equivalent to:
arr = Array(1..3)
# All three of these examples return:
[1,2,3]

References:

• The official Ruby documentation for arrays.