Ruby Homework Help l Homework in Ruby l Project
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Ruby is a modern language that gained popularity for web development with Ruby on Rails. Ruby is a mix of Python, C, Java and Pascal. So if you need help with ruby programming assignment, please get in touch with us.
Variables that are in all capitals are constants (in C/Java code this is by convention but not enforced). 0 and “” (empty string, empty list, etc) all evaluate as false, unlike Python/C/Javascript, nil however is treated as false so is often used to indicate failure. Class variables are private are are only exposed by getter and setter methods. The until statement is more like the while statement in Python/C/Java.
Ruby Programming Homework Help
The classic Hello World in Ruby is simply
puts "Hello World"
Integer literals are objects and can have methods called on them, this means that decimal values need a digit after the . (so 1. should be 1.0).
-1.abs # get the absolute value "Hello".length # 5 "Hello".uniq.sort.join # Hello (method calls can be chained) print "Hello" # can use print instead of puts
Since puts is used to “put” a string to the console, gets is used to get a string from the console.
Strings in ruby can be represented in a few ways
html = "<html>\n<bosy>\n" # A string that takes 2 lines html = %Q{<html>\n<bosy>\n} # An alternate form (useful if you want to use " in the text) html = %{<html>\n<bosy>\n} # The Q is not needed html = %/<html>\n<bosy>\n/ # We can use / instead of {} html = <<-BLOCK # PHP style multiline <html> <body> BLOCK path = "/pics/ruby.jpg" html = %/<img src="#{path}">/ # <img src="/pics/ruby.jpg">
Arrays are similar to Python.
arr = [1, 2, 4, 8, [16, 32]] arr[3] # 8 arr.reverse # [[16, 32], 8, 4, 2, 1] arr.flatten # [1, 2, 4, 8, 16, 32]
A dictionary is called a Hash in Ruby.
phone = { :police -> '911', :information -> '411' } print phone[:police] # prints 911
The if statement does not use endif but end
if rand(2) == 1: print "Heads" else print "Tails" end
You can use either { } or do / end to create a block
File.readlines('readme.txt').each do |line| # we pass the line to the block puts line end
And to enumerate over a collection
names = ['Tom', 'Dick', 'Harry'] names.each {|name| puts %/Hello #{name}/}
It supports classes
class Employee attr_reader :name, :salary def initialize(name, salary) @name, @age = name, salary end def <=>(employee) # for comparing employees we use the salary salary <=> employee.salary end def to_s # Convert to a string "#{name} ($#{salary}.00)" end end staff = [ Employee.new("Boss", 10000), Employee.new("Manager", 5000), Employee.new("Janitor", 1000) ] puts staff.sort.reverse # Displays the staff in order of salary
So you may have a Ruby programming project help in which you need assistance with, or it could be Ruby on Rails which is a web framework written in Ruby. Rails is a MVC (Model, View, Controller) framework, that includes a database backend as well as templates for the html.
Normally you define a model in a file of the entity, and it creates a table of the plural form.
So employee.rb defines the employees table.
class Employee attr_accessor :name, :salary def initialize(attributes = {}) @name = attributes[:name] @salary = attributes[:salary] end def monthly_pay @salary / 12 end end
A controller is used to make changes to the model, for example to increase salary or it can be a function such as issue pay check.
The view is handled with a mixture of html and Ruby in a file with a .erb extension.
<% provide(:title, 'Staff directory') %> <h1>Staff Directory</h1> <table class="staff"> <tr> <th>Name</th><th>Salary</th> </tr> <% @employees.each do |employee| %> <tr> <td><%= employee.name %></td> <td>$<%= employee.salary %>.00</td> </tr> <% end %> </table>
Ruby on Rails is used on some big sites including AirBNB, GitHub and Hulu, so if you need use to do a Ruby on rails project then we can help with ruby programming assignment.
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