eloquent ruby

Tutorial on the basic usage of Regular Expressions in Ruby programs, ruby Regular Expressions Most of Ruby's built-in types are similar to other programming languages. Mainly include strings, integers, floats, and arrays. However, only script languages such as Ruby, Perl, and awk provide support for built-in expression types. Although the regular expression is re

Explain in detail the condition judgment statements in Ruby and explain the ruby judgment statements Ruby provides conditional structures, which are common in modern programming languages. Here, we will explain all the Ruby conditional statements and modifiers.Ruby if... else statement:Syntax: if conditional [then] co

Matrix concatenation algorithm implemented by Ruby and ruby matrix concatenation Dynamic Planning solves the problem of matrix concatenation, generates matrix sequences randomly, and outputs results in the form of (A1 (A2A3) (A4A5. Code: #encoding: utf-8=beginauthor: xu jin, 4100213date: Oct 28, 2012MatrixChainto find an optimum order by using MatrixChain algorithmexample output:The given array is:[30, 35,

Simple implementation of the Bubble Sorting Algorithm and Ruby version, and the Bubble Sorting Algorithm ruby Algorithm principle: Compares adjacent elements. If the first is bigger than the second, exchange the two of them.Perform the same operation on each adjacent element, from the first to the last. At this point, the final element should be the largest number.Repeat the preceding steps for all elements

machineInitialization completeStart the environment execution vagrant Halt shutdown environment by executing vagrant up in the appropriate directory when usedOther points of attentionAfter successful initialization, a configuration file named Vagrantfile is generated in the appropriate directory, which can be set for network, memory size, and other content.This article is from the "7692323" blog, please be sure to keep this source http://7702323.blog.51cto.com/7692323/1596334Build a

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

In the process of using ruby/rails, it is found that sometimes performance is unsatisfactory, such as the generation of a 3-layer tree with 600 items of the directory to spend 20ms, in order to improve performance in the learning to write Ruby module with C + +, the understanding of the Swig, Rubyinline a series of assistive tools that help you write C/A + + to improve