Julie Mao jules27

Introduction

After working through exercises for learning Ruby as part of preparation for the upcoming Dev Bootcamp (note: no longer exists), we had a friendly discussion about the exercise to implement a Reverse Polish notation calculator. At the end of discussion, one of the staff members, Jesse, posted his solution to students.

The solution is well-designed, clean, and easy to read. However, one line of code caught my eye:

tokenize(array).inject([]) do |stack, token|
      <...>
end.pop

	#!bash
	#
	# bash/zsh completion support for core Git.
	#
	# Copyright (C) 2006,2007 Shawn O. Pearce <[email protected]>
	# Conceptually based on gitcompletion (http://gitweb.hawaga.org.uk/).
	# Distributed under the GNU General Public License, version 2.0.
	#
	# The contained completion routines provide support for completing:
	#

	# Enable directory and file color highlighting
	export CLICOLOR=1
	export LSCOLORS=GxFxCxDxBxegedabagacad

	# Common aliases
	alias rm='rm -i'
	alias ll='ls -l'
	alias la='ls -a'
	alias vi='vim'

	set nocompatible
	set hidden
	set hlsearch
	set wildmenu
	set ruler
	syntax on
	set expandtab
	autocmd BufNewFile,BufRead Gemfile set filetype=ruby

	<?xml version="1.0" encoding="utf-8" ?>
	<!-- SQL XML created by WWW SQL Designer, http://code.google.com/p/wwwsqldesigner/ -->
	<!-- Active URL: http://socrates.devbootcamp.com/sql -->
	<sql>
	<datatypes db="mysql">
	<group label="Numeric" color="rgb(238,238,170)">
	<type label="Integer" length="0" sql="INTEGER" re="INT" quote=""/>
	<type label="Decimal" length="1" sql="DECIMAL" re="DEC" quote=""/>
	<type label="Single precision" length="0" sql="FLOAT" quote=""/>
	<type label="Double precision" length="0" sql="DOUBLE" re="DOUBLE" quote=""/>

	# 3 versions of Ruby installed
	jmao$ rvm list

	rvm rubies

	ruby-1.8.7-p352 [ i686 ]
	ruby-1.9.2-p290 [ x86_64 ]
	=* ruby-1.9.3-p194 [ x86_64 ]

	# => - current