smits
/
ruby-uebungen
1
3
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

Update of exercises

master
Thomas Smits 2023-05-25 17:49:42 +02:00
parent fe2c1c6eb6
commit 58bc23516c
41 changed files with 82 additions and 41 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

3
Assignment_001/solution/readme.md
View File

@ -1,6 +1,7 @@
# Lösung: Bedingte Zuweisung
<div style="border: 1px solid grey;"><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br></div>```ruby
```ruby
a = nil
a ||= 'leer'
```

3
Assignment_002/solution/readme.md
View File

@ -1,6 +1,7 @@
# Lösung: Case
<div style="border: 1px solid grey;"><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br></div>
```ruby
note = 3
text = case note

3
Assignment_003/solution/readme.md
View File

@ -1,6 +1,7 @@
# Lösung: String-Formatierung
<div style="border: 1px solid grey;"><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br></div>
```ruby
name = "Peter"
gewicht = 90

3
Assignment_004/solution/readme.md
View File

@ -1,6 +1,7 @@
# Lösung: Parallele Zuweisung
<div style="border: 1px solid grey;"><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br></div>
```ruby
def swap(a, b)
[ b, a ]

3
Assignment_005/solution/readme.md
View File

@ -1,6 +1,7 @@
# Lösung: Ranges
<div style="border: 1px solid grey;"><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br></div>
```ruby
(1..20).each { |e| puts e }
```

3
Assignment_006/solution/readme.md
View File

@ -1,6 +1,7 @@
# Lösung: Splat
<div style="border: 1px solid grey;"><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br></div>
```ruby
ort = [ 49.468408, 8.482504, \
'Hochschule Mannheim', \

3
Assignment_007/solution/readme.md
View File

@ -1,6 +1,7 @@
# Lösung: Symbole
<div style="border: 1px solid grey;"><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br></div>
```ruby
def ansage(ursache)

3
Assignment_008/solution/readme.md
View File

@ -1,6 +1,7 @@
# Lösung: Zugriffsmethoden
<div style="border: 1px solid grey;"><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br></div>
```ruby
class Professor
attr_reader :name

3
Assignment_009/solution/readme.md
View File

@ -1,6 +1,7 @@
# Lösung: Klasse deklarieren
<div style="border: 1px solid grey;"><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br></div>```ruby
```ruby
class Ticket
attr_reader :spiel

3
Assignment_010/solution/readme.md
View File

@ -1,6 +1,7 @@
# Lösung: Default Parameter
<div style="border: 1px solid grey;"><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br></div>```ruby
```ruby
def produkt(a, b, c = 1, d = 1)
a * b * c * d
end

3
Assignment_011/solution/readme.md
View File

@ -1,6 +1,7 @@
# Lösung: Vererbung
<div style="border: 1px solid grey;"><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br></div>```ruby
```ruby
class Mensch
attr_reader :name, :alte

3
Assignment_012/solution/readme.md
View File

@ -1,6 +1,7 @@
# Lösung: Keyword-Parameter
<div style="border: 1px solid grey;"><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br></div>```ruby
```ruby
def greet(vorname:, nachname:)
puts "Hello #{vorname} #{nachname}"
end

3
Assignment_013/solution/readme.md
View File

@ -1,6 +1,7 @@
# Lösung: Mixin benutzen
<div style="border: 1px solid grey;"><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br></div>```ruby
```ruby
class Squares
include Enumerable

3
Assignment_014/solution/readme.md
View File

@ -1,6 +1,7 @@
# Lösung: Modul schreiben
<div style="border: 1px solid grey;"><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br></div>```ruby
```ruby
module Chemie
N_a = 6.02214179E23
M_v = 22.413996

3
Assignment_015/solution/readme.md
View File

@ -1,6 +1,7 @@
# Lösung: Monkey Patch
<div style="border: 1px solid grey;"><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br></div>```ruby
```ruby
class String
def to_leet
self.tr('aeiou', '43107')

3
Assignment_016/solution/readme.md
View File

@ -1,6 +1,7 @@
# Lösung: Geschachtelte Methoden
<div style="border: 1px solid grey;"><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br></div>```ruby
```ruby
class Bomb
def self.activate
def explode

3
Assignment_017/solution/readme.md
View File

@ -1,6 +1,7 @@
# Lösung: Vararg-Methoden
<div style="border: 1px solid grey;"><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br></div>```ruby
```ruby
def produkt(*p)
p.reduce { |s, e| s *= e }
end

3
Assignment_018/solution/readme.md
View File

@ -1,6 +1,7 @@
# Lösung: Arrays
<div style="border: 1px solid grey;"><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br></div>```ruby
```ruby
stapel = []
for farbe in %w{P X H K}

3
Assignment_019/solution/readme.md
View File

@ -1,6 +1,7 @@
# Lösung: Callback mit Block
<div style="border: 1px solid grey;"><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br></div>```ruby
```ruby
def rechner(a, b)
ergebnis = yield a, b
ergebnis * 2

3
Assignment_020/solution/readme.md
View File

@ -1,6 +1,7 @@
# Lösung: Callback mit Proc
<div style="border: 1px solid grey;"><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br></div>```ruby
```ruby
def rechner(a, b, lam = nil, &block)
lam ||= block
ergebnis = lam.call(a, b)

3
Assignment_021/solution/readme.md
View File

@ -1,6 +1,7 @@
# Lösung: Closure
<div style="border: 1px solid grey;"><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br></div>```ruby
```ruby
def create_counter
n = 0 # closure
Proc.new { n += 1 }

3
Assignment_022/solution/readme.md
View File

@ -1,6 +1,7 @@
# Lösung: Hashes und Blöcke
<div style="border: 1px solid grey;"><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br></div>```ruby
```ruby
class Cache
def initialize(&callback)
@data = {}

3
Assignment_023/solution/readme.md
View File

@ -1,6 +1,7 @@
# Lösung: Hashes
<div style="border: 1px solid grey;"><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br></div>
```ruby
worte = %w{ Bier Schnaps Bier Vodka Rum Baileys Rum Bier Vodka Bier Hugo }

3
Assignment_024/solution/readme.md
View File

@ -1,6 +1,7 @@
# Lösung: Map
<div style="border: 1px solid grey;"><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br></div>
```ruby
def leeter(array)
array.map do |e|

3
Assignment_025/solution/readme.md
View File

@ -1,6 +1,7 @@
# Lösung: Map und Reduce
<div style="border: 1px solid grey;"><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br></div>
```ruby
def char_count(array)
counts = array.map { |e| e.length }

3
Assignment_026/solution/readme.md
View File

@ -1,6 +1,7 @@
# Lösung: Ausnahmen
<div style="border: 1px solid grey;"><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br></div>```ruby
```ruby
def division(a, b)
raise ArgumentError unless (a.is_a? Numeric) && (b.is_a? Numeric)
raise ZeroDivisionError if b == 0

3
Assignment_027/solution/readme.md
View File

@ -1,6 +1,7 @@
# Lösung: Klasse Dir und IO
<div style="border: 1px solid grey;"><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br></div>```ruby
```ruby
def print(f)
n = 0
puts f, "\n"

3
Assignment_028/solution/readme.md
View File

@ -1,5 +1,6 @@
# Lösung: Iteratoren auf Zahlen
<div style="border: 1px solid grey;"><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br></div>```ruby
```ruby
10.downto(0) { |n| puts n }
```

3
Assignment_029/solution/readme.md
View File

@ -1,5 +1,6 @@
# Lösung: Quine
<div style="border: 1px solid grey;"><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br></div>```ruby
```ruby
p = "p = \"%s\"; puts p %% [ p.gsub(/[\"\\\\]/, '\"' => '\\\"', '\\\\' => '\\\\\\\\') ]"; puts p % [ p.gsub(/["\\]/, '"' => '\\"', '\\' => '\\\\') ]
```

3
Assignment_030/solution/readme.md
View File

@ -1,6 +1,7 @@
# Lösung: Reguläre Ausdrücke: Match
<div style="border: 1px solid grey;"><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br></div>```ruby
```ruby
def tag?(text)
!!(/^<.*?>$/ =~ text)
end

3
Assignment_031/solution/readme.md
View File

@ -1,6 +1,7 @@
# Lösung: Reguläre Ausdrücke: Matching
<div style="border: 1px solid grey;"><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br></div>```ruby
```ruby
def reverser(s)
/(.*) (.*)/ =~ s
"#{$2} #{$1}"

3
Assignment_032/solution/readme.md
View File

@ -1,6 +1,7 @@
# Lösung: Klassen per Reflection analysieren
<div style="border: 1px solid grey;"><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br></div>```ruby
```ruby
def analyze(clazz)
puts "Name: #{clazz.to_s}"
puts "Elternklasse: #{clazz.superclass}"

3
Assignment_033/solution/readme.md
View File

@ -1,6 +1,7 @@
# Lösung: Methoden einer Klasse dynamisch erzeugen
<div style="border: 1px solid grey;"><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br></div>```ruby
```ruby
def to_leet(s)
s.tr('aeiou', '43107')
end

3
Assignment_034/solution/readme.md
View File

@ -1,6 +1,7 @@
# Lösung: Klasse dynamisch erzeugen
<div style="border: 1px solid grey;"><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br></div>```ruby
```ruby
def create_class(super_class)
Class.new(super_class) do
def who_am_i

3
Assignment_035/solution/readme.md
View File

@ -1,6 +1,7 @@
# Lösung: Methoden dynamisch aufrufen
<div style="border: 1px solid grey;"><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br></div>```ruby
```ruby
def crazy_caller(obj)
# Methoden suchen
obj.methods.each do |m|

3
Assignment_036/solution/readme.md
View File

@ -1,6 +1,7 @@
# Lösung: Eigenclass einer Klasse
<div style="border: 1px solid grey;"><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br></div>```ruby
```ruby
class Numeric
class << self
def to_binary(n)

3
Assignment_037/solution/readme.md
View File

@ -1,6 +1,7 @@
# Lösung: Eigenclass eines Objektes
<div style="border: 1px solid grey;"><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br></div>```ruby
```ruby
s1 = "Hallo"
s2 = "Welt"

3
Assignment_038/solution/readme.md
View File

@ -1,6 +1,7 @@
# Lösung: Macro
<div style="border: 1px solid grey;"><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br></div>```ruby
```ruby
module Javanator
def Javanator::javafy
def toString; to_s; end

3
Assignment_039/solution/readme.md
View File

@ -1,6 +1,7 @@
# Lösung: Metaprogrammierung: Die kleine Petze
<div style="border: 1px solid grey;"><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br></div>```ruby
```ruby
class Snitch
def method_missing(name, *args, **keywords, &block)
puts "Aufruf von Methode '#{name}'"

3
Assignment_040/solution/readme.md
View File

@ -1,6 +1,7 @@
# Lösung: Singleton Methoden
<div style="border: 1px solid grey;"><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br></div>```ruby
```ruby
s1 = "Hallo"
s2 = "Welt"

3
Assignment_041/solution/readme.md
View File

@ -1,6 +1,7 @@
# Lösung: Struct
<div style="border: 1px solid grey;"><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br></div>```ruby
```ruby
# Klasse (sic!) über Struct erzeugen
Studierender = Struct.new(:vorname, :nachname, :geboren, :matrikel, :fakultaet)