It's an interesting experiment but standard Ruby is expressive enough. [9, 64].map { Math.sqrt(_1) } #=> [3.0, 8.0] For the first example I would just define

It's an interesting experiment but standard Ruby is expressive enough. [9, 64].map { Math.sqrt(_1) } #=> [3.0, 8.0] For the first example I would just define a method that uses local variables. They're local so it's not polluting context.