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A MODULE cannot be subclassed or INSTANTIATED, and MODULES can IMPLEMENT MIXINS.

A module cannot be subclassed or instantiated, and modules can implement mixins.

For LOOP, While loop, Until Loop.

For loop, While loop, Until Loop.

Public, PROTECTED, and PRIVATE.

• Public methods can be called by all objects and SUBCLASSES of the class in which they are defined in.
• Protected methods are only accessible to objects within the same class.
• Private methods are only accessible within the same INSTANCE.

Public, protected, and private.

symbols are IMMUTABLE and reusable, retaining the same object_id.

Be prepared to DISCUSS the benefits of using symbols vs. STRINGS, the EFFECT on memory usage, and in which situations you would USE one over the other.

symbols are immutable and reusable, retaining the same object_id.

Be prepared to discuss the benefits of using symbols vs. strings, the effect on memory usage, and in which situations you would use one over the other.

Setter and getter methods in RUBY are generated with the attr_accessor METHOD. attr_accessor is USED to GENERATE instance variables for DATA that’s not stored in your database column.

You can also take the long route and create them manually.

Setter and getter methods in Ruby are generated with the attr_accessor method. attr_accessor is used to generate instance variables for data that’s not stored in your database column.

You can also take the long route and create them manually.

To CREATE MIGRATION command INCLUDES

C:rubyapplication>RUBY script/generate migration table_name

To create migration command includes

C:rubyapplication>ruby script/generate migration table_name

RUBY REGULAR expression is a special sequence of characters that helps you MATCH or find other strings. A regular expression literal is a PATTERN between ARBITRARY delimiters or slashes followed by %r.

Ruby regular expression is a special sequence of characters that helps you match or find other strings. A regular expression literal is a pattern between arbitrary delimiters or slashes followed by %r.

Free format – You can start writing from program from any line and column.
Case sensitive – The UPPERCASE and LOWERCASE letters are distinct.
Comments – Anything followed by an unquoted #, to the END of the line on which it appears, is ignored by the interpreter.
Statement delimiters- Multiple STATEMENTS on one line must be SEPARATED by semicolons, but they are not required at the end of a line.

Free format – You can start writing from program from any line and column.
Case sensitive – The uppercase and lowercase letters are distinct.
Comments – Anything followed by an unquoted #, to the end of the line on which it appears, is ignored by the interpreter.
Statement delimiters- Multiple statements on one line must be separated by semicolons, but they are not required at the end of a line.

The difference between PROCS and BLOCKS,

• Block is just the part of the SYNTAX of a METHOD while proc has the characteristics of a block.
• Procs are objects, blocks are not.
• At most ONE block can appear in an argument list.
• Only block is not able to be stored into a variable while Proc can.

The difference between Procs and Blocks,

The DIFFERENCES of the methods nil and false are:

• nil cannot be a VALUE, where as a false can be a value.
• A method RETURNS TRUE or false in case of a predicate, other wise nil is returned.
• false is a boolean data type, where as nil is not.
• nil is an object for NilClass, where as false is an object of for FalseClass

The differences of the methods nil and false are:

The function super is used to invoke the ORIGINAL method, SEARCHING of the method body starts in the super class of the OBJECT that was found to contain the original method. The following example DEPICTS the same.

def url=(address)
super (address.blank? || address.starts_with?('http')) ? address : http://#{address}
END

The function super is used to invoke the original method, searching of the method body starts in the super class of the object that was found to contain the original method. The following example depicts the same.

def url=(address)
super (address.blank? || address.starts_with?('http')) ? address : http://#{address}
end

INSERTING a string into a literal is called as INTERPOLATION. Interpolation is a very important process in Ruby. Interpolation can be done by using only one way by embedding # within {}. A new name is REFERRED to the COPY of the original name.

Inserting a string into a literal is called as interpolation. Interpolation is a very important process in Ruby. Interpolation can be done by using only one way by embedding # within {}. A new name is referred to the copy of the original name.

If you DECLARE one variable as GLOBAL we can access any where, where as class variable VISIBILITY only in the class 

If you declare one variable as global we can access any where, where as class variable visibility only in the class 

• False is a BOOLEAN DATATYPE 
• Nil is not a data TYPE 

Ruby is a dynamic, open SOURCE programming language. It focuses on productivity and SIMPLICITY. The syntax is elegant which is natural to read and easy to write and use. The language is flexible, since it allows the developers alter freely all its parts. At will, one can remove essential parts and redefined. For instance , the symbol + can be redefined by the word ‘plus’ to one of the its classes – Numeric.

Ruby SUPPORTS multiple programming paradigms, such as, functional, imperative, object ORIENTED, relative. Dynamic memory management and dynamic TYPE systems are additional features of Ruby.

Ruby is a dynamic, open source programming language. It focuses on productivity and simplicity. The syntax is elegant which is natural to read and easy to write and use. The language is flexible, since it allows the developers alter freely all its parts. At will, one can remove essential parts and redefined. For instance , the symbol + can be redefined by the word ‘plus’ to one of the its classes – Numeric.

Ruby supports multiple programming paradigms, such as, functional, imperative, object oriented, relative. Dynamic memory management and dynamic type systems are additional features of Ruby.

RubyGems provides a standard FORMAT for distributing ruby programs and LIBRARIES. It works as a package MANAGER for the Ruby PROGRAMMING LANGUAGE. RubyGems is now a part of the standard library from Ruby version 1.9.

RubyGems provides a standard format for distributing ruby programs and libraries. It works as a package manager for the Ruby programming language. RubyGems is now a part of the standard library from Ruby version 1.9.

INTERPOLATION is a process of INSERTING a string into a literal. It is a very important process in RUBY. A string can be interpolated into a literal by placing a hash (#) WITHIN {} open and close BRACKETS.

Interpolation is a process of inserting a string into a literal. It is a very important process in Ruby. A string can be interpolated into a literal by placing a hash (#) within {} open and close brackets.

FOLLOWING are the DIFFERENT ENVIRONMENT VARIABLES present in the Ruby:

• RUBYOPT
• RUBYLIB
• RUBYPATH
• RUBYSHELL
• RUBYLIB_PREFIX

Following are the different environment variables present in the Ruby:

A single-quoted STRINGS don’t PROCESS ASCII escape codes, and they don’t do string INTERPOLATION.

A single-quoted strings don’t process ASCII escape codes, and they don’t do string interpolation.

• Gem: A gem is a just ruby code. It is installed on a machine, and it’s available for all ruby applications RUNNING on that machine.
• PLUGIN: Plugin is also ruby code, but it is installed in the APPLICATION folder and only available for that SPECIFIC application.

Ruby is known as a language of flexibility because it FACILITATES its AUTHOR to ALTER the programming elements. Some specific parts of the language can be removed or redefined. Ruby does not restrict the user. For EXAMPLE, to add two numbers, Ruby allows to use + sign or the word 'plus'. This alteration can be done with Ruby's built-in CLASS Numeric.

Ruby is known as a language of flexibility because it facilitates its author to alter the programming elements. Some specific parts of the language can be removed or redefined. Ruby does not restrict the user. For example, to add two numbers, Ruby allows to use + sign or the word 'plus'. This alteration can be done with Ruby's built-in class Numeric.

Ruby is a dynamic, reflective, general purpose, open source programming language that FOCUSES on simplicity and productivity. Ruby has a mixed features of Perl, small talk, Eiffel, ADA and LISP. Ruby was designed to create a new language which MAKES a balance with the FUNCTIONALITY of Imperative languages.

Ruby is a dynamic, reflective, general purpose, open source programming language that focuses on simplicity and productivity. Ruby has a mixed features of Perl, small talk, Eiffel, Ada and Lisp. Ruby was designed to create a new language which makes a balance with the functionality of Imperative languages.