Building on my original Ruby Arrays article a few more things you can do with Ruby Arrays.
a = [1,2,3] b = [4,5,6] c = [a,b] > [[1,2,3],[4,5,6]] # Not quite what we wanted. c = [a,b].flatten > [1,2,3,4,5,6]
This can be achieved much simpler via addition
a = [1,2,3] b = [4,5,6] c = a + b > [1,2,3,4,5,6]
Another cool fact that you can subtract array from each other. It will subtract objects which have matching object ids.
a = [1,2,3] b = [4,5,6] c = a + b - [3,4] > [1,2,5,6]
This can also be used to list the unique methods of an object by subtracting all base methods.
fl = 0.0 # a float count_this = fl.methods.sort - Object.methods count_this.count => 52 Object.methods.count => 102 fl.methods.count => 127