teach me how to use `each_cons` in ruby

To learn how to use each_cons in Ruby, you can follow these steps:

1. Understand the purpose of each_cons: each_cons is a method provided by the Enumerable module in Ruby that allows you to iterate over consecutive elements in a collection. It takes a single argument, n, which specifies the size of each consecutive group.

2. Use each_cons with an array: One of the common use cases of each_cons is with arrays. Here's an example:

main.rb
array = [1, 2, 3, 4, 5]
array.each_cons(3) do |group|
  puts group.inspect
end
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5 lines

Output:

main.rb
[1, 2, 3]
[2, 3, 4]
[3, 4, 5]
30 chars
4 lines

In the above example, each_cons(3) is used to iterate over consecutive groups of 3 elements in the array. You can perform any desired operation in the block, in this case, we are printing each group.

3. Use each_cons with other enumerable objects: each_cons is not limited to arrays; it can also be used with other enumerable objects. Here's an example using a range:

main.rb
range = (1..5)
range.each_cons(2) do |group|
  puts group.inspect
end
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5 lines

Output:

main.rb
[1, 2]
[2, 3]
[3, 4]
[4, 5]
28 chars
5 lines

In this example, each_cons(2) is used to iterate over consecutive groups of 2 elements in the range.

4. Experiment and explore: To gain a better understanding of each_cons, you can try using it with different collection types and different values for n. Additionally, you can combine each_cons with other array or enumerable methods to achieve more complex functionality.

Remember to consult the Ruby documentation on each_cons for more details and additional options that you can utilize.