Ruby Developer

In Ruby, methods may either be public, protected, or private. Public methods can be called by anyone. Protected methods are only accessible within their defining class and its subclasses. Private methods can only be accessed and viewed within their defining class.

☛ 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.

To list out all routes for an application you can write rake routes in the terminal.

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

Rails will report errors from Apache in the log/Apache.log and errors from the Ruby code in log/development.log.

Rails active record is the Object/Relational Mapping (ORM) layer supplied with Rails. It follows the standard ORM model as

☛ Table map to classes

☛ Rows map to objects

☛ Columns map to object attributes

When migrating to a new version, self.up method is used while self.down method is used to roll back my changes if needed.

Rails Migration enables Ruby to make changes to the database schema, making it possible to use a version control system to leave things synchronized with the actual code.

Types of variables available in Ruby Class are,

☛ Local Variables

☛ Global Variables

☛ Class Variables

☛ Instance Variables

Ruby Interpolation is the process of inserting a string into a literal. By placing a Hash (#) within {} open and close brackets, one can interpolate a string into the literal.

Mixin in Ruby offers an alternative to multiple inheritances, using mixin modules can be imported inside other class.

RJs is a template that produces JavaScript which is run in an eval block by the browser in response to an AJAX request. It is sometimes used to define the JavaScript, Prototype and helpers provided by Rails.

☛ Float class is used whenever the function changes constantly.

☛ Dig is used whenever you want to represent a float in decimal digits.

☛ Max is used whenever there is a huge need of Float.

In Ruby, the code in the block is always enclosed within braces ({}). You can invoke a block by using “yield statement”.