回答編集履歴
3
Update
test
CHANGED
@@ -60,13 +60,11 @@
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60
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# testing
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63
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-
["A", "B", "C", "D", "String", "", 1, true, nil].each{|input|
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+
["A", "B", "C", "D", "Parent", "String", "", 1, true, nil].each{|input|
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64
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65
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-
output = (Class.const_
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+
output = ((Class.const_get(input) < Parent rescue false) || nil) &&
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66
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-
Class.const_get(input) < Parent &&
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68
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-
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-
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+
Class.const_get(input).new.greeting
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printf("%8p: %p\n", input, output)
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70
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@@ -76,13 +74,15 @@
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#
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-
"A": "Hi, I'm A, now 1
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+
"A": "Hi, I'm A, now 2021-12-01 03:21:21 +0900."
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78
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"B": "Hi, I'm B, rolling dice and got
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"B": "Hi, I'm B, rolling dice and got 2."
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"C": "Hi, I'm C, 1 + 1 = 2 // Q.E.D."
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"D": nil
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+
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"Parent": nil
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"String": nil
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2
Update
test
CHANGED
@@ -52,34 +52,46 @@
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52
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53
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-
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+
class D
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-
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end
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-
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-
Class.const_get(input) < Parent && Class.const_get(input).new.greeting
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-
in
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+
# testing
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-
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["A", "B", "C", "D", "String", "", 1, true, nil].each{|input|
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65
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output = (Class.const_defined?(input) rescue nil) &&
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-
Class.const_get(input) < Parent &&
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Class.const_get(input) < Parent &&
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68
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Class.const_get(input).new.greeting
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printf("%8p: %p\n", input, output)
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}
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-
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+
#
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78
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-
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"A": "Hi, I'm A, now 1970-01-01 00:00:00."
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80
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75
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-
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"B": "Hi, I'm B, rolling dice and got 1."
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"C": "Hi, I'm C, 1 + 1 = 2 // Q.E.D."
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"D": nil
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-
in
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"String": nil
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-
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"": nil
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1: nil
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+
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-
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true: nil
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+
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nil: nil
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```
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1
Update
test
CHANGED
@@ -54,32 +54,32 @@
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input = "A"
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puts (Object.const_defined?(input) rescue false) &&
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-
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Class.const_get(input) < Parent && Class.const_get(input).new.greeting
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input = "B"
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puts (Object.const_defined?(input) rescue false) &&
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-
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Class.const_get(input) < Parent && Class.const_get(input).new.greeting
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65
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70
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input = "C"
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puts (Object.const_defined?(input) rescue false) &&
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-
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+
Class.const_get(input) < Parent && Class.const_get(input).new.greeting
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76
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77
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78
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input = "D"
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80
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75
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-
puts
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81
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+
puts (Object.const_defined?(input) rescue false) &&
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76
82
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77
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-
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-
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79
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-
#["A", "B", "C", "D"].each{|i|
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-
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81
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-
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83
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+
Class.const_get(input) < Parent && Class.const_get(input).new.greeting
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82
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-
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83
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-
#}
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84
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```
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