Skip to main content

List of Common mistakes in Ruby



Always use spaces around operators, after commas, colons and semicolons, around { and before }. White space might be (mostly) irrelevant to the Ruby interpreter, but its proper use is the key to writing easily readable code. Also it makes the design more readable and code much cleaner.

product = 1 * 2
array = [1, 2, 3, 4, 5]
array.map { |a| a + 2 }


There should be no spaces after (, [ or before ], ) these brackets.

['ankur', 'vyas']
sum(a, b)

Also don't use spaces in while providing the range.

Use 5..9 over 5 .. 9
Use 'a'..'z' over 'a' .. 'z'

When using switch case statements use the following indentation.

case
  when input = '+'
    puts 'The operation is addition'
  when '-'
    puts 'The operation is subtraction'
  when '*'
    puts 'The operation is multiplication'
  else
    puts 'The operation is division'
end

Use following indentation if the parameters exceeds to more than one line.

def send_mail(source)
  Mailer.deliver( to: 'ankurvy1@gmail.com',
                  from: 'someone@someone.com',
                  subject: 'Message subject',
                  body: source.text)
end

Use splat for better assignments.

element_1, *other_elements = ['a', 'n', 'k', 'u', 'r']

If only 2 conditions are present use the ternary operators.

var_1 = condition ? assignment_1 : assignment_2


If you are setting a variable using the if condition the use following syntax.

variable_result = if condition_1
                    a
                  else_if condition_2
                    b
                  else
                    c
                  end

Avoid return statements at the end of the line. In ruby the last line of the method is returned.

Use snake case for all the ruby variables.

variable_1, some_variable

Use camel case for class names.

ClassOne, ClassTwo

Use screaming snake case for the constants' names.

CONSTANT_1, CONSTANT_2


Use %w for the string arrays and %i for the symbol arrays.

STATUS_MAP = %w(open closed draft paid)
SYMBOL_MAP = %i(symbol1 symbol2 symbol3)

Use interpolation over concatenation.

Use "#{string_1} < #{string2} >" over string_1 + '<' + string2 + '>'

Assign single quotes to the string which does not have interpolation.

Use 'string 1' over "string 1"

Do not use the word partial when you don't want to pass some variables in it.

Use render 'partial_1' over render partial: 'partial_1'


Reference:



Comments

Popular posts from this blog

5 Useful Android Apps

There are many apps available for Android but these are some useful apps which I use regularly.
1. Money View: Financial Planning
Description: With the Free Money View app, you get a real-time visibility into your entire Personal Finances. It works by itself without any manual data entry - their daily expense manager app organizes our financial summary by analyzing SMS sent by our bank and billers to our phone. The app auto-tracks your expense, bills and account balances across all our financial accounts to help us stay on top of our money. The app is highly secure as it never reads any sensitive data - no full bank account numbers, no OTP, and no Netbanking login/password.
As it anaylzes the money transactions via the SMS in our phone it is highly useful app for tracking our expenses, so we can know our money is going in which direction so we can control it.




More information:  https://play.google.com/store/apps/details?id=com.whizdm.moneyview&hl=en

2. Any.do To-do List | Task List
Descr…

OOP Polymorphism

Definition: "Poly" stands for "many" and "morph" stands for "forms". Generally, polymorphism means one name different uses. Technically, it means being able to send the same message to different objects and get different result.
Polymorphism through Inheritance
We can achieve polymorphism through inheritance. For example
classGenericParser defparseraiseNotImplementedError, 'You must implement the parse method'endendclassJsonParser < GenericParserdefparseputs'An instance of the JsonParser class received the parse message'endendclassXmlParser < GenericParserdefparseputs'An instance of the XmlParser class received the parse message'endendHere the GenericParser is the base class. Class JsonParser and XmlParser are inherited from the GenericParser.
Now suppose we run the below code.
puts'Using the XmlParser' parser = XmlParser.new parser.parse puts'Using the JsonParser' parser = JsonParser.new parser.parseThe o…