familiarity.rb

# Building Ruby Familiarity
 
# In this exercise you will take a first look at some common commands in Ruby
# The idea here is to build familiary with Ruby syntax
# This will likely be the first time you've seen some of these commands
# Just type them in and see the displayed output
 
# Steps:
#   1. Open up a new terminal window
#   2. Launch irb
#   3. Paste a line of code into irb
#   4. Press return
#   5. Write down the displayed output
#   6. Repeat steps 3-5 for all lines below in order
 
 
first_ans = 7 / 2
# 3

puts first_ans
# 3

print first_ans
# 3

first_ans = 7 / 2.to_f
#3.5
 
first_ans = 7.to_f / 2
#3.5 

first_ans = 7 / 2.0
#3.5
 
first_ans = 7.0 / 2
#3.5
 
first_ans = first_ans.round * 4
# 16
 
 
def get_character(full_string, index)
  full_string[index]
end
# nil
 
 
message_string = "oicdlcwhejkeenoemrstuo"
# oicdlcwhejkeenoemrstuo 
 
 
character_1 = get_character(message_string, 4)
# l 
character_2 = get_character(message_string, 7)
 # h
character_3 = get_character(message_string, 2)
 # c
 
message_array = [character_1, character_2]
 # ["l", "h"] 
message_array.push(character_2)
 # ["l", "h", "h"] 
message_array.pop()
 # h
message_array.push(character_3)
# ["l", "h", "c"] 
 
 
message_array
 # ["l", "h", "c"] 
puts message_array
#l
#h
#c
 
print message_array
 # ["l", "h", "c"] => nil
 
 
value_float_1 = Math.sin(Math::PI / 2)
#1.0 
value_float_2 = Math.cos(Math::PI)
#-1.0 
 
 
value_float_3 = (value_float_1 + value_float_2)
 #0.0
value_integer_1 = (value_float_1 + value_float_2).to_i
 #0
 
value_float_1 = value_float_1 * 4
 #4.0
value_float_2 *= 5
#-5.0 
value_float_2 = value_float_2.abs
 #5.0
value_integer_1 += 8
 #8
value_float_4 = value_integer_1 * 3
 #24
value_float_3 -= 1
#-1.0 
 
 
number_array = [value_float_1, value_float_2, value_float_3, value_float_4]
# [4.0, 5.0, -1.0, 24] 
number_array.push(first_ans)
 #  => [4.0, 5.0, -1.0, 24, 16] 
number_array.unshift(value_integer_1)
#  => [8, 4.0, 5.0, -1.0, 24, 16] 
number_array.push(value_integer_1)
 # => [8, 4.0, 5.0, -1.0, 24, 16, 8] 

number_array.unshift( Math.sqrt(36) )
 # => [6.0, 8, 4.0, 5.0, -1.0, 24, 16, 8] 

number_array.delete_at(5)
 
# 24 
 
number_array.push( [19, 21, 6, 3, 1] )
 #  => [6.0, 8, 4.0, 5.0, -1.0, 16, 8, [19, 21, 6, 3, 1]] 

number_array.flatten!
 # => [6.0, 8, 4.0, 5.0, -1.0, 16, 8, 19, 21, 6, 3, 1] 

 
number_array.each { |current_index| puts get_character(message_string, current_index) }
#welcome to wdi