For 2021 - online Python 3 training - see ((here)).
Our plans were to retire in summer 2020 and see the world, but Coronavirus has lead us into a lot of lockdown programming in Python 3 and PHP 7. We can now offer tailored online training - small groups, real tutors - works really well for groups of 4 to 14 delegates. Anywhere in the world; course language English.
Please ask about private 'maintenance' training for Python 2, Tcl, Perl, PHP, Lua, etc. |
Standard methods available on all objects in Ruby
There are a lot of things I can do with any object in Ruby - there's a whole package deal of methods available to me by just defining and creating an object:
irb(main):003:0> class Thing
irb(main):004:1> end
=> nil
irb(main):005:0> widget = Thing.new
=> #<Thing:0x98c1e74>
irb(main):006:0> widget.methods
=> [:nil?, :===, :=~, :!~, :eql?, :hash, :<=>, :class, :singleton_class, :clone, :dup, :initialize_dup,
:initialize_clone, :taint, :tainted?, :untaint, :untrust, :untrusted?, :trust, :freeze, :frozen?, :to_s, :inspect,
:methods, :singleton_methods, :protected_methods, :private_methods, :public_methods,
:instance_variables, :instance_variable_get, :instance_variable_set, :instance_variable_defined?,
:instance_of?, :kind_of?, :is_a?, :tap, :send, :public_send, :respond_to?, :respond_to_missing?, :extend,
:display, :method, :public_method, :define_singleton_method, :object_id, :to_enum, :enum_for, :==,
:equal?, :!, :!=, :instance_eval, :instance_exec, :__send__, :__id__]
irb(main):007:0>
Question from last weeks course - But what do all of these DO?
Answer - I've added a list which describes most of them [here]. (written 2012-06-23, updated 2012-06-30)
Associated topics are indexed as below, or enter http://melksh.am/nnnn for individual articles R108 - Ruby - More Classes and Objects [184] MTBF of coffee machines - (2005-01-20) [656] Think about your design even if you don't use full UML - (2006-03-24) [1217] What are factory and singleton classes? - (2007-06-04) [1587] Some Ruby programming examples from our course - (2008-03-21) [2292] Object Orientation in Ruby - intermediate examples - (2009-07-16) [2601] Ruby - is_a? v instance_of? - what is the difference? - (2010-01-27) [2603] Ruby objects - a primer - (2010-01-29) [2604] Tips for writing a test program (Ruby / Python / Java) - (2010-01-29) [2616] Defining a static method - Java, Python and Ruby - (2010-02-01) [2620] Direct access to object variable (attributes) in Ruby - (2010-02-02) [2623] Object Oriented Ruby - new examples - (2010-02-03) [2717] The Multiple Inheritance Conundrum, interfaces and mixins - (2010-04-11) [2977] What is a factory method and why use one? - Example in Ruby - (2010-09-30) [2980] Ruby - examples of regular expressions, inheritance and polymorphism - (2010-10-02) [3142] Private and Public - and things between - (2011-01-22) [3154] Changing a class later on - Ruby - (2011-02-02) [3158] Ruby training - some fresh examples for string handling applications - (2011-02-05) [3260] Ruby - a training example that puts many language elements together to demonstrate the whole - (2011-04-23) [3760] Why you should use objects even for short data manipulation programs in Ruby - (2012-06-10) [3781] Private, Protected, Public in Ruby. What about interfaces and abstract classes in Ruby? - (2012-06-23) [4366] Changing what operators do on objects - a comparison across different programming languages - (2014-12-26) [4504] Where does Ruby load modules from, and how to load from current directory - (2015-06-03) [4550] Build up classes into applications sharing data types in Ruby - (2015-10-23) [4551] Testing your new class - first steps with cucumber - (2015-10-23)
Some other Articles
Improving Wiltshire Rail Offer - it WILL be happeningProgramming languages - what are the differences between them?Steam train calls at Melksham - PicturesLoad path, load and require in Ruby, and a change from 1.8 to 1.9Standard methods available on all objects in RubyRuby of Rails - cleanly displaying model data in the viewAdding validation to form entries and sticky fields - Ruby on RailsProviding a form to allow the user to add data to the model - Ruby on RailsMultiple views in a single appication - sharing common parts of the template - Ruby on Rails
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This is a page archived from The Horse's Mouth at
http://www.wellho.net/horse/ -
the diary and writings of Graham Ellis.
Every attempt was made to provide current information at the time the
page was written, but things do move forward in our business - new software
releases, price changes, new techniques. Please check back via
our main site for current courses,
prices, versions, etc - any mention of a price in "The Horse's Mouth"
cannot be taken as an offer to supply at that price.
Link to Ezine home page (for reading).
Link to Blogging home page (to add comments).
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