mirror of
https://github.com/System-End/Rooms-We-Share.git
synced 2026-04-20 00:35:20 +00:00
277 lines
8.7 KiB
Ruby
Executable file
277 lines
8.7 KiB
Ruby
Executable file
# frozen_string_literal: true
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# ===============================================================
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# Welcome to repl.rb
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# ===============================================================
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# You can experiement with code within this file. Code in this
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# file is only executed when you save (and only excecuted ONCE).
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# ===============================================================
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# ===============================================================
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# REMOVE the "x" from the word "xrepl" and save the file to RUN
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# the code in between the do/end block delimiters.
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# ===============================================================
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# ===============================================================
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# ADD the "x" to the word "repl" (make it xrepl) and save the
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# file to IGNORE the code in between the do/end block delimiters.
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# ===============================================================
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# Remove the x from xrepl to run the code. Add the x back to ignore to code.
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xrepl do
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puts "The result of 1 + 2 is: #{1 + 2}"
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end
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# ====================================================================================
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# Ruby Crash Course:
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# Strings, Numeric, Booleans, Conditionals, Looping, Enumerables, Arrays
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# ====================================================================================
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# ====================================================================================
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# Strings
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# ====================================================================================
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# Remove the x from xrepl to run the code. Add the x back to ignore to code.
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xrepl do
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message = 'Hello World'
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puts "The value of message is: #{message}"
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puts "Any value can be interpolated within a string using \#{}."
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puts "Interpolated message: #{message}."
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puts "This #{message} is not interpolated because the string uses single quotes."
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end
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# ====================================================================================
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# Numerics
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# ====================================================================================
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# Remove the x from xrepl to run the code. Add the x back to ignore to code.
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xrepl do
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a = 10
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puts "The value of a is: #{a}"
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puts "a + 1 is: #{a + 1}"
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puts "a / 3 is: #{a / 3}"
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end
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# Remove the x from xrepl to run the code. Add the x back to ignore to code.
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xrepl do
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b = 10.12
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puts "The value of b is: #{b}"
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puts "b + 1 is: #{b + 1}"
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puts "b as an integer is: #{b.to_i}"
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puts ''
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end
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# ====================================================================================
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# Booleans
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# ====================================================================================
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# Remove the x from xrepl to run the code. Add the x back to ignore to code.
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xrepl do
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c = 30
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puts "The value of c is #{c}."
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puts 'This if statement ran because c is truthy.' if c
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end
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# Remove the x from xrepl to run the code. Add the x back to ignore to code.
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xrepl do
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d = false
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puts "The value of d is #{d}."
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puts 'This if statement ran because d is falsey, using the not operator (!) makes d evaluate to true.' unless d
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e = nil
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puts "Nil is also considered falsey. The value of e is: #{e}."
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puts 'This if statement ran because e is nil (a falsey value).' unless e
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end
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# ====================================================================================
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# Conditionals
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# ====================================================================================
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# Remove the x from xrepl to run the code. Add the x back to ignore to code.
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xrepl do
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i_am_true = true
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i_am_false = false
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puts '======== if statement'
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i_am_one = 1
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puts 'This was printed because i_am_one is truthy.' if i_am_one
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puts '======== if/else statement'
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if i_am_false
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puts 'This will NOT get printed because i_am_false is false.'
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else
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puts 'This was printed because i_am_false is false.'
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end
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puts '======== if/elsif/else statement'
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if i_am_false
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puts 'This will NOT get printed because i_am_false is false.'
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elsif i_am_true
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puts 'This was printed because i_am_true is true.'
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else
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puts 'This will NOT get printed i_am_true was true.'
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end
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puts '======== case statement '
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i_am_one = 1
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case i_am_one
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when 10
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puts 'case equaled: 10'
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when 9
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puts 'case equaled: 9'
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when 5
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puts 'case equaled: 5'
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when 1
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puts 'case equaled: 1'
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else
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puts "Value wasn't cased."
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end
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puts '======== different types of comparisons'
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puts 'equal (4 == 4)' if 4 == 4
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puts 'not equal (4 != 3)' if 4 != 3
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puts 'less than (3 < 4)' if 3 < 4
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puts 'greater than (4 > 3)' if 4 > 3
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puts 'or statement ((4 > 3) || (3 < 4) || false)' if (4 > 3) || (3 < 4) || false
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puts 'and statement ((4 > 3) && (3 < 4))' if (4 > 3) && (3 < 4)
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end
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# ====================================================================================
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# Looping
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# ====================================================================================
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# Remove the x from xrepl to run the code. Add the x back to ignore to code.
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xrepl do
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puts '======== times block'
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3.times do |i|
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puts i
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end
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puts '======== range block exclusive'
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(0...3).each do |i|
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puts i
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end
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puts '======== range block inclusive'
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(0..3).each do |i|
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puts i
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end
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end
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# ====================================================================================
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# Enumerables
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# ====================================================================================
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# Remove the x from xrepl to run the code. Add the x back to ignore to code.
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xrepl do
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puts '======== array each'
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colors = %w[red blue yellow]
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colors.each do |color|
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puts color
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end
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puts '======== array each_with_index'
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colors = %w[red blue yellow]
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colors.each_with_index do |color, i|
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puts "#{color} at index #{i}"
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end
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end
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# Remove the x from xrepl to run the code. Add the x back to ignore to code.
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xrepl do
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puts '======== single parameter function'
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def add_one_to(n)
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n + 5
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end
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puts add_one_to(3)
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puts '======== function with default value'
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def function_with_default_value(v = 10)
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v * 10
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end
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puts "passing three: #{function_with_default_value(3)}"
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puts "passing nil: #{function_with_default_value}"
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puts '======== Or Equal (||=) operator for nil values'
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def function_with_nil_default_with_local(a = nil)
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result = a
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result ||= 'or equal operator was exected and set a default value'
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end
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puts "passing 'hi': #{function_with_nil_default_with_local 'hi'}"
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puts "passing nil: #{function_with_nil_default_with_local}"
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end
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# ====================================================================================
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# Arrays
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# ====================================================================================
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# Remove the x from xrepl to run the code. Add the x back to ignore to code.
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xrepl do
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puts '======== Create an array with the numbers 1 to 10.'
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one_to_ten = (1..10).to_a
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puts one_to_ten
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puts '======== Create a new array that only contains even numbers from the previous array.'
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one_to_ten = (1..10).to_a
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evens = one_to_ten.find_all(&:even?)
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puts evens
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puts '======== Create a new array that rejects odd numbers.'
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one_to_ten = (1..10).to_a
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also_even = one_to_ten.reject(&:odd?)
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puts also_even
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puts '======== Create an array that doubles every number.'
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one_to_ten = (1..10).to_a
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doubled = one_to_ten.map do |number|
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number * 2
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end
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puts doubled
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puts '======== Create an array that selects only odd numbers and then multiply those by 10.'
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one_to_ten = (1..10).to_a
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odd_doubled = one_to_ten.find_all(&:odd?).map do |odd_number|
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odd_number * 10
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end
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puts odd_doubled
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puts '======== All combination of numbers 1 to 10.'
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one_to_ten = (1..10).to_a
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all_combinations = one_to_ten.product(one_to_ten)
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puts all_combinations
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puts '======== All uniq combinations of numbers. For example: [1, 2] is the same as [2, 1].'
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one_to_ten = (1..10).to_a
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uniq_combinations =
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one_to_ten.product(one_to_ten)
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.map(&:sort).uniq
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puts uniq_combinations
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end
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# ====================================================================================
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# Advanced Arrays
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# ====================================================================================
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# Remove the x from xrepl to run the code. Add the x back to ignore to code.
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xrepl do
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puts '======== All unique Pythagorean Triples between 1 and 40 sorted by area of the triangle.'
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one_to_hundred = (1..40).to_a
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triples =
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one_to_hundred.product(one_to_hundred).map do |width, height|
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[width, height, Math.sqrt(width**2 + height**2)]
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end.find_all do |_, _, hypotenuse|
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hypotenuse.to_i == hypotenuse
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end.map do |triangle|
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triangle.map(&:to_i)
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end.uniq(&:sort).map do |width, height, hypotenuse|
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[width, height, hypotenuse, (width * height) / 2]
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end.sort_by do |_, _, _, area|
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area
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end
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triples.each do |width, height, hypotenuse, area|
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puts "(#{width}, #{height}, #{hypotenuse}) = #{area}"
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end
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end
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