assessments.md

Ruby and General Programming:

• What is a class? What is an object? What are the differences in Ruby?

• Are instance variables available to class methods?

• What are the differences between blocks, procs and lambdas in Ruby?

• Write a method that sorts the keys in a hash by the length of the key as a string. For instance, the hash:

  { abc: 'hello', 'another_key' => 123, 4567 => 'third' }

  should result in:

  [ "abc", "4567", "another_key" ]

• Write a function to return the Nth number of Fibonacci sequence.

• Write a method that returns if a string is a palindrome. For example, "racecar" is a palindrome but "apple" is not.

  def palindrome?(string)
  end

• Pangrams are sentences constructed by using every letter of the alphabet at least once. For example, this sentence "The quick brown fox jumps over the lazy dog" is a pangram. Write a method that given a string, it tells if it is a pangram.

• Find all job postings with the word "Ruby" in it from here: https://news.ycombinator.com/item?id=9996333

Web:

• What happens when you type "www.google.com" into your browser? Give me as much details as possible
• Tell me some HTTP headers in HTTP request and response
• What does "Cross Site Scripting" mean?

SQL/DB:

• what are the 4 basic commands of SQL? What do they do?
• what is a join? what are differnet types of SQL joins?
• what is an index? what does it do?
• what is a foreign key? what does it do?

Rails

• What are Rails helpers? Why would you use them?

• What is "SQL Injection"?

• Explain how Rails handles an incoming request

• What's the difference between render vs redirect

• what's "Strong Parameters"?

• What's the issue with the controller code below? How would you fix it?

  class CommentsController < ApplicationController
    def users_comments
      posts = Post.all
      comments = posts.map(&:comments).flatten
      @user_comments = comments.select do |comment|
        comment.author.username == params[:username]
      end
    end
  end