Toy iterator package

Slightly enamored with jQuery's selector notation, e.g., $('<a>').each(...) to iterate over objects, this implements a similar but reverse notation for R objects. So things like .(mtcars)$each(median) will apply the median to each object. Akin to sapply(mtcars, median) of course, but the point is more objects fit into the same form (no apply versus sapply).

This package needs some serious thought as to exactly what the interface should be, as it is now it is just an experiment

Example

The following examples illlustrate a bit.

> install_github("IterateR", "jverzani")
> require(IterateR)
> require(MASS)
> require(MASS)
## simple example
> .(mtcars)$each(median)
    mpg     cyl    disp      hp    drat      wt    qsec      vs      am    gear 
 19.200   6.000 196.300 123.000   3.695   3.325  17.710   0.000   0.000   4.000 
   carb 
  2.000 
## chaining of commands
> .(Cars93)$filter(is.numeric)$each(median)
         Min.Price              Price          Max.Price           MPG.city 
              14.7               17.7               19.6               21.0 
       MPG.highway         EngineSize         Horsepower                RPM 
              28.0                2.4              140.0             5200.0 
      Rev.per.mile Fuel.tank.capacity         Passengers             Length 
            2340.0               16.4                5.0              183.0 
         Wheelbase              Width        Turn.circle     Rear.seat.room 
             103.0               69.0               39.0               27.5 
      Luggage.room             Weight 
              14.0             3040.0