hindenbug

  #Frg Jmp
  
def solution(x, y, d)
  # write your code in Ruby 1.9.3
  diff = (y - x)
  return 0 if diff.zero?
    
  i = (diff.to_f/d).ceil
  return i
end

hindenbug

; as clojure is built on top of Java, many of its types are old java types

(class 3)
=> java.lang.Long

hindenbug

; Comments start with semicolons.

; Clojure is written in "forms", which are just
; lists of things inside parentheses, separated by whitespace.
;
; The clojure reader  assumes that the first thing is a
; function or macro to call, and the rest are arguments.
;
; Here's a function that sets the current namespace:
(ns test)

hindenbug

; Comments start with semicolons.

; Clojure is written in "forms", which are just
; lists of things inside parentheses, separated by whitespace.
;
; The clojure reader  assumes that the first thing is a
; function or macro to call, and the rest are arguments.
;
; Here's a function that sets the current namespace:
(ns test)

hindenbug

;; eg: symbols in clojure, points to a verb or other values
;; when clojure evaluates a symbol it looks up that symbols meaning

inc

;; refer to symbols without evaluating its meaning
;; ' escapes a expression. Quote anything and get it back exactly
;; the same

'inc

hindenbug

• Clojure, the core data structures aren't mutable

Clojure Data Structures

Clojure has two types of expressions atoms and collections

ATOMS

Atoms represent Primitive Types in other languages, like:
Numbers, Strings, Boolean, Nil, Symbols, Keywords

hindenbug

###In order to use ruby-debug with ruby-1.9.3 you need to download the following from http://rubyforge.org/frs/?group_id=8883 ###

  linecache19-0.5.13.gem
  ruby_core_source-0.1.5.gem
  ruby-debug19-0.11.6.gem
  ruby-debug-base19-0.11.26.gem

###then from the terminal run,###

  gem install ruby_core_source-0.1.5.gem -- --with-ruby-include=$rvm_path/src/ruby-1.9.3-p0

hindenbug

# in Gemfile

gem "fastercsv", :platforms => [:mri_18, :ruby_18]


# in app/config/environment.rb

require "csv"
unless !CSV.const_defined? :Reader
 require "fastercsv"

hindenbug

l = "i am what i am"
# to integer
l.unpack('U*') # => [105, 32, 97, 109, 32, 119, 104, 97, 116, 32, 105, 32, 97, 109]  

# to hex
l.unpack('H*') # => ["6920616d2077686174206920616d"] 

# if you want the hex in array form then
l.unpack('U*').map{|i| i.to_s(16)} # => ["69", "20", "61", "6d", "20", "77", "68", "61", "74", "20", "69", "20", "61", "6d"]