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

Gem::Installer::ExtensionBuildError: ERROR: Failed to build gem native extension.

    /Users/manoj/.rvm/rubies/ruby-2.0.0-p247/bin/ruby extconf.rb
creating Makefile
Compiling v8 for x64
Using python 2.7.6
Configured with: --prefix=/Applications/Xcode.app/Contents/Developer/usr --with-gxx-include-dir=/usr/include/c++/4.2.1
Unable to find a compiler officially supported by v8.
It is recommended to use GCC v4.4 or higher

hindenbug

Start of Heisenbug logging ======================================
# Logfile created on 2013-10-27 21:17:25 +0530 by logger.rb/31641
Started GET "/users/user_273" for 127.0.0.1 at 2013-10-27 21:17:25 +0530
Processing by UsersController#show as HTML
  Parameters: {"id"=>"user_273"}
  Rendered shared/sidebar/_gravatar.haml (0.1ms)
  Rendered shared/_pagination.haml (0.0ms)
  Rendered updates/_list.html.haml (0.3ms)
  Rendered users/show.haml within layouts/application (5.7ms)
  Rendered shared/_head.html.haml (0.9ms)

hindenbug

1) PYTHON
2) CLOJURE
3) SCALA
4) HASKELL
5) Node.js

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"