Outline
In this blog, you’ll see how to use Array in Ruby.
Basic usage
You can define and use the array like the below.
cats = ['Nabi', 'Mini', 'Kitty']
puts cat[0]
# Navi
Like other languages, the Ruby array index is also started 0.
Array.new
Below is the easiest way to define the array.
cats = ['Nabi', 'Mini', 'Kitty']
But, you can also use Array.new to make an array.
cats = Array.new
# []
If you define with no parameter like above, the 0 element array is created.
cats = Array.new(2)
# [nil, nil]
If you set one parameter like above, the array is created with the size of the number, and filled nil.
cats = Array.new(3, 1)
# [1, 1, 1]
If you define the array as above, the array has 3 elements filled 1 value.
Array size
You can use size / length to get the array size.
cats = ['Nabi', 'Mini', 'Kitty']
cats.size
# 3
You can use length as below.
cats = ['Nabi', 'Mini', 'Kitty']
cats.length
# 3
Clear array
You can use the clear function to delete all values in the array.
cats = ['Nabi', 'Mini', 'Kitty']
cats.clear
# []
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