The Book of Ruby

Blocks Within Blocks

You’ve already seen how to use a block to iterate over an array. In the next example (also in 4blocks.rb), I use one block to iterate over an array of strings, assigning each string in turn to the block variable s. A second block is then passed to the caps method in order to capitalize the string:

["hello","good day","how do you do"].each{
    |s|
    caps( s ){ |x| x.capitalize!
        puts( x )
    }
}

This results in the following output:

Hello
Good day
How do you do