Ruby Training - Revision history

Iwiseman: /* Scrabble Scoring */

2026-05-20T04:46:47Z

Scrabble Scoring

← Older revision		Revision as of 04:46, 20 May 2026
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	end		end

			</syntaxhighlight>
			And homework

			<syntaxhighlight lang="rb">

			class Scrabble
			GROUPED_SCORES = {
			1 => "AEIOULNRST",
			2 => "DG",
			3 => "BCMP",
			4 => "FHVWY",
			5 => "K",
			8 => "JX",
			10 => "QZ"
			}.freeze

			LETTER_SCORES = GROUPED_SCORES.each_with_object({}) do \|(points, letters), score_map\|
			letters.each_char { \|letter\| score_map[letter] = points }
			end.freeze

			def initialize(string)
			@string = string
			end

			def score
			@string.each_char.sum { \|ch\| LETTER_SCORES.fetch(ch.upcase, 0) }
			end
			end
	</syntaxhighlight>		</syntaxhighlight>

2026-05-20T04:44:16Z

zip

← Older revision		Revision as of 04:44, 20 May 2026
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	end		end
	end</syntaxhighlight>		end</syntaxhighlight>
			=Scrabble Scoring=
			Something handy at last
			<syntaxhighlight lang="rb">

			class Scrabble
			LETTER_SCORES = {
			"A" => 1, "E" => 1, "I" => 1, "O" => 1, "U" => 1,
			"L" => 1, "N" => 1, "R" => 1, "S" => 1, "T" => 1,
			"D" => 2, "G" => 2,
			"B" => 3, "C" => 3, "M" => 3, "P" => 3,
			"F" => 4, "H" => 4, "V" => 4, "W" => 4, "Y" => 4,
			"K" => 5,
			"J" => 8, "X" => 8,
			"Q" => 10, "Z" => 10
			}.freeze

			def initialize(string)
			@string = string
			end

			def score
			@string.each_char.sum { \|ch\| LETTER_SCORES.fetch(ch.upcase, 0) }
			end
			end

			</syntaxhighlight>

2026-05-20T04:05:49Z

Reduce in Ruby

← Older revision		Revision as of 04:05, 20 May 2026
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	* Or		* Or
	* \b\w+ word boundary, letters		* \b\w+ word boundary, letters
			=zip=
			Never seen this but u can zip things provided they are the same lengths. So a is compared with b and it counts how many not equal.
			<syntaxhighlight lang="rb">
			module Hamming
			def self.compute(a, b)
			raise ArgumentError unless a.length == b.length
			a.chars.zip(b.chars).count { \|x, y\| x != y }
			end
			end</syntaxhighlight>

2026-05-20T04:02:29Z

Reduce in Ruby

← Older revision		Revision as of 04:02, 20 May 2026
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	end		end
	</syntaxhighlight>		</syntaxhighlight>
			And the regex /\b\w+'\w+\|\b\w+\b/ Always seems to be hard until explained.
			* \b\w+'\w+ word boundary, letters, apostrophe, letters - This allows for apostophe. so Iain's, don't
			* Or
			* \b\w+ word boundary, letters

2026-05-20T03:11:21Z

Floor and Ceil

@@ Line 356: / Line 356: @@
    # This will round down
    (score - 10) / 2
 </syntaxhighlight>

2026-05-20T02:22:53Z

Arrays

@@ Line 72: / Line 72: @@
 *sort
 *reverse
 =LINQ in Ruby?=

2026-05-19T22:59:08Z

Exceptions

← Older revision		Revision as of 22:59, 19 May 2026
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	end		end
	end		end
			</syntaxhighlight>
			=Floor and Ceil=
			Never does alot of this and always with unit tests so it does not matter. '''Floor''' round down, '''ceil''' round up. By default ruby floors so
			<syntaxhighlight lang="rb">
			# This will round down
			(score - 10) / 2
	</syntaxhighlight>		</syntaxhighlight>

2026-05-19T22:38:10Z

Interpolation

← Older revision		Revision as of 22:38, 19 May 2026
Line 65:		Line 65:
	puts my_var3		puts my_var3
	</syntaxhighlight>		</syntaxhighlight>
			=Arrays=
			These have a lot of functions e.g. array_name.blah which include
			*last
			*first
			*max
			*sort
			*reverse

	=LINQ in Ruby?=		=LINQ in Ruby?=

2026-05-19T22:30:11Z

Interpolation

← Older revision		Revision as of 22:30, 19 May 2026
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	puts my_var2		puts my_var2
	</syntaxhighlight>		</syntaxhighlight>
			Better is
			<syntaxhighlight lang="rb">
			my_var1 = "HELLO1"
			my_var2 = 123
			my_var3 = "FRED WAS HERE %s, %d" % [my_var1, my_var2]
			puts my_var3
			</syntaxhighlight>

	=LINQ in Ruby?=		=LINQ in Ruby?=
	So this is what was given		So this is what was given

2026-05-19T22:08:14Z

global substitute with regex

← Older revision		Revision as of 22:08, 19 May 2026
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	</syntaxhighlight>		</syntaxhighlight>
	==global substitute with regex==		==global substitute with regex==
	So will never learn regex just to difficult for me. Know how to solve so not an issue. ~~Here is replace anything~~ not ~~matching~~ a-z or A-Z with ""		So will never learn regex just to difficult for me. Know how to solve so not an issue.
			*[...] means set
			*^ inside bracket means not like maths
			*a-z means what it says a,b,...z
			*A-Z means what it says A,B,...Z
			*\s means whitespace, space, tab, newline, carriage return
			So substitute anything not in set with ""
	<syntaxhighlight lang="rb">		<syntaxhighlight lang="rb">
	phrase.gsub(/[^a-zA-Z\s]/, "")		phrase.gsub(/[^a-zA-Z\s]/, "")