Bloc Web Development Blocks Checkpoint

blocks

##Sorting

# This method should take an array of strings or hashes as an argument, and sort each element by its length

def sort_by_length(sort_this_array)
  sort_this_array.sort { |x,y| x.length <=> y.length }
end

# Create method named filter that takes an array of numbers as an argument 
# and returns an array consisting of numbers that are greater than 5.

def filter(filter_this_array)
  filter_this_array.select { |num| num > 5 }
end

##Mapping

# Create an add_two method that takes an array of numbers and returns an array of strings.

def add_two(map_this_array)
  map_this_array.map { |item| "#{item} + 2 = #{item + 2}" }
end

## Practice with Yield

class Array
  def new_map
    a = []
    self.each do |item|
    a << yield(item)
    end
    a
  end
  
  def new_map!(&block)
  array = self
  self.replace(self.new_map(&block))
  end
end

Notes -

The spaceship operator returns 1,0 or -1 based on the value of the left argument relative to the value of the right argument. For example: a <=> b returns:

-1 if a < b
0 if a = b
1 if a > b