explain what this code does and why `arr = [1, 2, 3, 4, 5] arr.each {|a| print a -= 10, " "}` in ruby

The given code snippet is written in Ruby and it performs the following actions:

1. Initialize an array arr with the values [1, 2, 3, 4, 5].
2. Use the each method on the arr array to iterate over each element.
3. For each iteration, subtract 10 from the current element a and then print the updated value followed by a space.

So, the code prints the results of subtracting 10 from each element of the arr array.

The each method is a built-in iterator in Ruby that allows you to iterate over elements of an array or any other enumerable object. In this case, it is used to iterate over each element of the array arr. The {|a| ... } syntax is a block, a piece of code that gets executed for each iteration. In the block, a represents each element of the array.

By using the compound assignment operator -= along with the print statement, the code subtracts 10 from each element of the array and then prints the updated value along with a space.

The output of the code will be: -9 -8 -7 -6 -5

This code snippet can be useful when you need to modify each element of an array or perform some operation on each element and also want to print the results.