In Ruby, you can get the length of an array using either Array#length or its alias Array#size. These methods return the total count of elements in an array.
For example:
puts [1, 2, 3].length #=> 3 puts [1, 2, 3].size #=> 3
puts [].length #=> 0 puts [].size #=> 0
Additionally, you can use the Array#count method for the same purpose when it's used without any arguments:
puts [1, 2, 3].count #=> 3
puts [].count #=> 0
However, Array#count has multiple uses beyond just getting the length of an array.
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