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  • Explain how http works in detail. Use diagrams.

  • Write a method that appends the words “in Ruby” to any English sentence, in Ruby.

  • Explain how APIs work. In detail. Diagrams would be helpful.

  • Explain how method_missing works. Show an example.

  • What is the purpose of yield? Show an example.

  • Explain how MVC works. Why is it beneficial? Diagrams, please.

=================================================== Implement a calculator in Ruby.

Calculator should be able to understand expressions like “1 + 1”, “2 * 2”, “5 - 4”.
Bonus: Implement (or explain how) a calculator that can handle order of operations.

=================================================== Write a function ‘interleave’ that alternates the contents of two or more arrays (or strings):

interleave(“123”, “abc”, “ABC”) # => “1aA2bB3cC”
interleave(“abc”, “12345”) # => “a1b2c345”
interleave(“abc”, “12345”, “efghi”) # => “a1eb2fc3g4h5i”

=================================================== Write a function ‘truncate’ that shortens a string to the provided length, INCLUDING a trailing ellipsis:

truncate(“this string”, 6) # => “thi…”

=================================================== Write a function ‘hashify’ that takes a 2D array (each inner array is a k/v pair) and creates a hash:

hashify([[‘k1’, ‘v1’], [‘k2’, ‘v2’]]) # => {‘k1’ => ‘v1’, ‘k2’ => ‘v2’}

=================================================== Write a function ‘fizzbuzz’ that prints the numbers 1..100, replacing:

numbers divisible by 3 with ‘fizz’
numbers divisible by 5 with ‘buzz’
numbers divisible by 3 and 5 with ‘fizzbuzz’

===================================================

  • Write a function that reverses an array, without using the reverse method.

=================================================== Flatten array

  • Write a method that flattens an array without using .flatten (turns an array with nested arrays (which could also hold more nested arrays) into one flat array.

=================================================== Search Sorted Array

  • Write a method to search a sorted array for a specific number. What is the runtime of the implementation?

===================================================

  • Write a function that counts the occurrences of each character in a string. Choosing a suitable data structure for storage is up to you.

    If the string was really really long (like all of Wikipedia) what would you need to do?

===================================================

  • Write a function called ‘map2x’ that takes an array of integers and returns a new array with each integer from the first array, doubled. Write this in Ruby, then Javascript or Coffeescript.

    map2x([1, 2, 3]) # => [2, 4, 6]

===================================================

  • Write a function called ‘map’ that takes an array and returns a new array with the result of applying the passed-in block to each element of the original array. Write this in Ruby, then Javascript or Coffeescript.

    map([1, 2, 3]) { |x| 2 * x } # => [2, 4, 6]

===================================================

  • Design a few SQL tables for storing Users, Posts, and allowing Users to upvote/downvote the Posts.

===================================================

  • Write a method that converts x amount of dollars into change and specify how much of each coin will you have. E.g. convert $2.65 and return the amount of quarters, dimes, nickels, and pennies.

===================================================

  • Construct a regular expression that matches a valid email address. You may use Rubular

===================================================

  • Pig latin string conversion - convert "hello" to "ellohay" & "Hello" to "Ellohay"