ruby on heroku

A few Ruby tips and Ruby tips Sequential call of code blocksCopy codeThe Code is as follows:Def touch_downYield [3, 7]Puts "touchdown! "EndTouch_down do | (first_down, second_down) |Puts "# {first_down} yards on the run"Puts "# {second_down} yards passed"End=> "3 yards on the run"=> "7 yards passed"=> "Touchdown! " It mainly refers to the use of array in block Retrieve elements from arrayCopy codeThe Code i

Example of the use of hundreds of semicolons and literal values in Ruby: ruby percent Use % () (abbreviated as % Q) for a single line string that requires interpolation and embedding double quotation marks ). Multi-line string, preferably heredocs. # bad (no interpolation needed) %( Do not use % q for strings without 'and. Unless many characters need to be escaped, the normal string is more readable.

Ruby string and array maximization problems, ruby Problems Max Method b=[1,3,55,777,2,4,6,8,0] For numeric data, max obtains the maximum value of the array, and min obtains the minimum value of the array. b.max => 777b.min => 0 It has no practical significance for comparing the size of string arrays,The example in ruby is # enum.max -> obj# enum.max { |a,

Ruby uses the proxy mode and decoration mode code instance in the design mode, and the ruby Design Mode Proxy Mode Requirements: James asked Xiao Li to chase Xiao Li for him (send dolls, flowers, and chocolate) No proxy code: #-*-Encoding: UTF-8-*-# suer class Pursuit attr_accessor: mm def initialize (mm) @ mm = mm end def give_dolls puts "# {mm. name} Show you the doll "end def give_flowers puts" # {mm. na

Detailed description of matching and replacement operations on strings by regular expressions in Ruby, and ruby Regular Expressions Regular Expression matching Speaking of Ruby, of course, we need to mention its regular expression mechanism. As a powerful matching language, regular expressions are increasingly used in different fields, from string verification, m

Three methods for executing periodic tasks (scheduled tasks) IN ruby: ruby periodic 1. Preface Whether using ruby for system management or using rails for web development, periodic tasks may occur. They are scheduled to take a certain period of time (1 hour, 2 days ......) continuously triggered. In ruby, I think it is

Ruby vs Python advantages and disadvantages, ruby vs python Ruby and Python are too similar, and most of the trade-offs are personal preferences. For example, I think Python's "There is only one way to do it. "than Ruby's" There are always ways to do it. "Well, it's not just about team collaboration. More importantly, you can quickly understand what code you wrot

Ruby 7-day entry (2 functions, arrays and classes), ruby 7-dayDAY 2 Continue the next day. Today we will focus on the basic elements of functions, collections, classes, and other programming.2.1 simple definition of function 2.1.1 def tell_me puts true end Defining a simple function (No parameter and no return value) is simple. Use def end to wrap the function body. 2.1.2 Parameters def tell_me(a)puts ae

This section describes the regular expressions and Ruby Regular Expressions in ruby. A regular expression is a character of a special sequence. It matches or searches for other strings or string sets by using a pattern with special syntax.Syntax A regular expression is literally a pattern between a slash or any separator following % r, as shown below: /Pattern // pattern/im # You can specify the option % r!

Interpreting the usage of annotations in Ruby and interpreting ruby annotations The Code Annotated In the Ruby line is ignored at runtime. Single line comment # starts with the characters. They start from # To the end of the line as follows: #! /Usr/bin/ruby-w # This is a single line comment. puts "Hello,

A simple tutorial on JSON Processing Using Ruby, and a json tutorial on ruby Processing Environment Configuration Before using Ruby to encode or decode JSON data, we need to install the Ruby JSON module. Before installing this module, you must first install Ruby gem. We will

Recommended syntax style in Ruby programming, and ruby programming syntax Style Use: Reference constants (including classes and modules) and constructors (such as Array () or Nokogiri: HTML ()).Never use: to call methods. # bad SomeClass::some_method some_object::some_method # good SomeClass.some_method some_object.some_method SomeModule::SomeClass::SOME_CONST SomeModule::SomeClass() Enclose def pa

Ruby is a powerful object-oriented scripting language that allows you to easily and quickly perform object-oriented programming. sometimes using formal object-oriented languages such as Smalltalk, Eiffel, and C ++ to develop small projects seems a little complicated. Ruby can meet these object-oriented programming needs. of course, you can also use Ruby for gener

) [Ruby on Rails series]8, a simple code-word generator and interpreter (below) The next article focuses on how to deploy the developed ROR program to the Internet using the Heroku platform"2" code generatorThe main algorithm: using mobile phone nine lattice keyboard and Qwer keyboard mapping relationship. The mapping table is as follows: Mapping table: Nine Gongge keyboard L

entities are destroyed Delete_all: All associated entities are deleted directly from the database, unrecoverable nullify: foreign keys are Set to NULL, unrecoverable restrict_with_exception: Throw exception hint Restrict_with_error: Throw error prompt 5, Foreign_key: Define column name for foreign Key 6, inverse_of : Indicates the inverse associated entity 7, Primary_key: Indicates the associated item ID 8, through: Indicates that a many-to-many relationship uses a third-party entity 9, validat

Notes for variable reference IN Ruby: Ruby variable reference In the expression, when Ruby sees a name like a, it needs to determine whether a is a local variable reference or a call to method a without parameters. Ruby uses a heuristic method to determine this situation. When Rub