diff options
| -rw-r--r-- | exercises.rb | 50 | ||||
| -rw-r--r-- | exercises_solutions.rb | 82 |
2 files changed, 90 insertions, 42 deletions
diff --git a/exercises.rb b/exercises.rb index c857a82..aee42e6 100644 --- a/exercises.rb +++ b/exercises.rb @@ -1,46 +1,33 @@ +# Exercise 1 # Write a function called `divide` that takes 2 arguments. # This function will divide the first argument by the second argument and return # the result. -def divide(a, b) - a / b -end +# Exercise 2 # Write a function called `hello5` that will print the string "hello" 5 times, # with each "hello" on a separate line -def hello5 - 5.times do - puts 'hello' - end -end +# Exercise 3 # Write a function called `hello_x_times` that takes 1 argument which is a # number. If the argument is 4, "hello" will be printed 4 times. Each "hello" # must be printed on the same line (e.g. "hellohellohellohello"). -def hello_x_times(count) - count.times do - print 'hello' - end -end +# Exercise 4 # Write a function called `string_plus` that takes 2 string arguments. It will # return a string with the second argument concatenated to the first ('working' # and 'example' become 'workingexample'). -def string_plus(str1, str2) - str1 + str2 -end +# Exercise 5 # Write a function called `join_reverse_array` that takes 1 argument, an array # of strings. It will return a string with each element of the array # concatenated in reverse order (['az', 'by', 'cx', 'dw'] becomes 'dwcxbyaz'). -def join_reverse_array(arr) - arr.reverse.join -end +# Exercise 6 # Write a function called `array_tack_join` that takes 2 arguments, an array of # strings, and a string. It will concatenate the second argument to each string # in the array and return a string with one string in the array per line (e.g. @@ -48,35 +35,14 @@ end # "banana cat # orange cat # apple cat" -def array_tack_join(arr, tack_str) - arr.map do |s| - s + tack_str - end.join "\n" -end +# Exercise 7 # Write a class called `Table`. When initialising `Table`, a decimal height must # be passed to the initialiser. The table instance's height can then be read and # set using `my_table.height` and `my_table.height = 20.9` -class Table - attr_accessor :height - - def initialize(height) - @height = height - end -end +# Exercise 8 # Copy your `Table` class and change the copy's name to `Table2`. Add a method # `height_times2` that returns the table's height * 2. -class Table2 - attr_accessor :height - - def initialize(height) - @height = height - end - - def height_times2 - @height * 2 - end -end diff --git a/exercises_solutions.rb b/exercises_solutions.rb new file mode 100644 index 0000000..c857a82 --- /dev/null +++ b/exercises_solutions.rb @@ -0,0 +1,82 @@ +# Write a function called `divide` that takes 2 arguments. +# This function will divide the first argument by the second argument and return +# the result. +def divide(a, b) + a / b +end + + +# Write a function called `hello5` that will print the string "hello" 5 times, +# with each "hello" on a separate line +def hello5 + 5.times do + puts 'hello' + end +end + + +# Write a function called `hello_x_times` that takes 1 argument which is a +# number. If the argument is 4, "hello" will be printed 4 times. Each "hello" +# must be printed on the same line (e.g. "hellohellohellohello"). +def hello_x_times(count) + count.times do + print 'hello' + end +end + + +# Write a function called `string_plus` that takes 2 string arguments. It will +# return a string with the second argument concatenated to the first ('working' +# and 'example' become 'workingexample'). +def string_plus(str1, str2) + str1 + str2 +end + + +# Write a function called `join_reverse_array` that takes 1 argument, an array +# of strings. It will return a string with each element of the array +# concatenated in reverse order (['az', 'by', 'cx', 'dw'] becomes 'dwcxbyaz'). +def join_reverse_array(arr) + arr.reverse.join +end + + +# Write a function called `array_tack_join` that takes 2 arguments, an array of +# strings, and a string. It will concatenate the second argument to each string +# in the array and return a string with one string in the array per line (e.g. +# ['banana', 'orange', 'apple'], ' cat' would become: +# "banana cat +# orange cat +# apple cat" +def array_tack_join(arr, tack_str) + arr.map do |s| + s + tack_str + end.join "\n" +end + + +# Write a class called `Table`. When initialising `Table`, a decimal height must +# be passed to the initialiser. The table instance's height can then be read and +# set using `my_table.height` and `my_table.height = 20.9` +class Table + attr_accessor :height + + def initialize(height) + @height = height + end +end + + +# Copy your `Table` class and change the copy's name to `Table2`. Add a method +# `height_times2` that returns the table's height * 2. +class Table2 + attr_accessor :height + + def initialize(height) + @height = height + end + + def height_times2 + @height * 2 + end +end |