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Math::PI
#=> 3.14159265358979

The rules are:

super               # passes all arguments
super()             # passes no arguments
super(arg1, arg2)   # passes these explicit arguments

So that:

class Chunk < ActiveRecord::Base  
    def initialize(*args)
        @count = 0
        super
    end
end
 
cnk = Chunk.create(:letter => ?a)

Inserts other_str before the character given at the index, modifying the string. Negative indices count from the end of the string, and insert after the given character. The intent is to insert a string so that it starts at the given index.

"abcd".insert(0, 'X')    #=> "Xabcd"
"abcd".insert(3, 'X')    #=> "abcXd"
"abcd".insert(4, 'X')    #=> "abcdX"
"abcd".insert(-3, 'X')   #=> "abXcd"
"abcd".insert(-1, 'X')   #=> "abcdX"

You could also do this:

"abcd".sub(/^.{2}/,'\0X') #=> abXcd

0.3.ceil
#=> 1
 
2.1.ceil
#=> 3

To find the index for the maximum value in an array, two array methods are chained together, Enumerable#each_with_index and Enumerable#max.

a = [3,4,5,2]
 
a.each_with_index.max
#=> [5, 2]
 
a.each_with_index.min
#=> [2, 3]