homework1.rb

# Q: Define a function to find the hypotenuse of a right triangle with side lengths a and b
# A:
def hypotenuse(a, b)
  # Return the hypotenuse of a triangle with lenght a and height b.
  return Math.sqrt(a **2 + b **2)
end
 
# Q: What methods do strings have that symbols don't? Describe a few. What methods do symbols have that strings don't?
# A: join, reverse, strip, chomp, sub - strings have many methods focused on manipulating strings
 
# Q: Why doesn't Fixnum.new work?
# A: Array and Hash are containers that hold other objects and are mutable, Fixnum is not a container and immutable

# Q: Write code using methods on at least one number, string, symbol, array and hash. Make a gist from the code.
# A:
4.modulo(2)
"Ruby, Ruby, Ruby".split(", ")
:ruby.to_s
[1, 2, "three", "four", 5].first
{ a: "Ruby", b: "is", c: "pretty", d: "cool" }.invert
 
# Q: Define Musher class such that Musher.new("+").mush(["array", "of", "strings"]) == "array + of + strings"
# A:
class Musher
  def initialize(sep)
    @sep = sep
  end
 
  def mush(arr)
    arr.join(" #{@sep} ")
  end
end
 
# Q: Define an Averager class that can compute the average of two numbers. Bonus: any number of numbers.
# A:
class Averager
  def self.average(*args)
    args.reduce(:+).to_f / args.length
  end
end
 
# Q: Write a script to read list of lines from a file and print one at random
# A:
def sample_line(fname)
  File.readlines(fname).sample.strip
end