1.2 KiB
1.2 KiB
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Ruby Arrays |
Ruby Arrays
An array represents a list of values. The individual values are often called "elements" of the array. To make an array in Ruby, use square brackets and separate values with commas:
my_array = [1, 2, 3, 4, 5]
You can also create an empty array by using the 'new' method in the 'Array' class:
my_array = Array.new
That first example is an array of numbers, but a Ruby array can contain values of different types, even other arrays:
mixed_array = [5, "Hello World", true, [1,2,3]]
You can access the elements of an array with square brackets and numerical indexes. Notice that the first element is at index 0, not 1:
mixed_array[0] # 5
mixed_array[1] # "Hello World"
mixed_array[2] # true
You can check how many elements an array has with the length
method:
mixed_array.length # 3
[].length # 0
You can check the first element of an array with the first
method:
mixed_array.first # 5
You can check the last element of an array with the last
method:
mixed_array.last # true