Ruby : Crazy Syntax (#244)

* Create CrazySyntax.rb

* Create README.md
* Update /README.md

Author: kimpro82

README.md

@@ -14,6 +14,7 @@ miscellaneous petty works
 - [My **C#** Practice](#my-c-practice)
 - [My **Java** Practice](#my-java-practice)
 - [My **Golang** Practice](#my-golang-practice)
+- [My **Ruby** Practice](#my-ruby-practice)
 - [My **BASIC** Practice](#my-basic-practice)
 - [My **Verilog** Practice](#my-verilog-practice)
 - [My **Auto Hot Key** Practice](#my-auto-hot-key-practice)
@@ -124,6 +125,11 @@ making a dashboard for managing Gitgub contributions by using `Github API`
 - [Grade (2021.12.06)](/Golang#grade-20211206)
 
 
+## [My Ruby Practice](./Ruby/)
+
+- [Ruby's Crazy Syntax (2022.12.24)](./Ruby/README.md#rubys-crazy-syntax-20221224)
+
+
 ## [My BASIC Practice](/BASIC#my-qbasic-practice)
 
 - [Draw A Car (2022.02.09)](/BASIC#draw-a-car-20220209)

Ruby/CrazySyntax.rb

@@ -0,0 +1,70 @@
+# Ruby's crazy syntax
+
+# 2022.12.24 (It is a good day to code!)
+
+
+# Falsey 0
+
+if 0 == false
+    puts "0 is false."
+elsif 0 == true
+    puts "0 is true, surprisingly."
+else
+    puts "0 is neither false nor true but falsey."
+end
+
+
+# Comparison operator vs eql?
+
+puts 1 == 1.0                                               # true
+puts 1.eql?(1.0)                                            # false
+
+
+# Range : .. vs ...
+
+rng1 = (1..10).to_a                                         # 1 ~ 10
+rng2 = (1...10).to_a                                        # 1 ~  9
+
+print rng1, "\n"
+print rng2, "\n"
+
+
+# Array : reverse vs reverse!
+
+arr = [1, 2, 3]
+
+arr.reverse                                                 # not save
+print arr, "\n"
+
+arr.reverse!                                                # save
+print arr, "\n"
+
+
+# Symbol : similar with strings but immutable and faster
+
+str = "I"
+sym = :U
+str += "♥"
+# sym += "2"                                                # undefined method `+' for :U:Symbol (NoMethodError)
+print str
+print sym, "\n"
+
+
+# .times : an iterator for numbers
+
+10.times do
+    print "no"
+end
+print "\n"
+
+
+# Return : return the last line's evaluated result without return in UDF
+
+def Say()
+    a = "I hate you"
+    b = "You make me crazy"
+    c = "I want to leave you, but"
+    d = "I love you"
+end
+
+puts Say()

Ruby/README.md

@@ -0,0 +1,97 @@
+# [My Ruby Practice](../README.md#my-ruby-practice)
+
+Like a red ruby, she told me with confidence that she loved you more than I did
+
+
+## \<List>
+
+- [Ruby's Crazy Syntax (2022.12.24)](#rubys-crazy-syntax-20221224)
+
+
+## [Ruby's Crazy Syntax (2022.12.24)](#list)
+
+#### `CrazySyntax.rb`
+
+```ruby
+# Falsey 0
+
+if 0 == false
+    puts "0 is false."
+elsif 0 == true
+    puts "0 is true, surprisingly."
+else
+    puts "0 is neither false nor true but falsey."
+end
+```
+> 0 is neither false nor true but falsey.
+
+```ruby
+# Comparison operator vs eql?
+
+puts 1 == 1.0                                               # true
+puts 1.eql?(1.0)                                            # false
+```
+> true  
+> false
+
+```ruby
+# Range : .. vs ...
+
+rng1 = (1..10).to_a                                         # 1 ~ 10
+rng2 = (1...10).to_a                                        # 1 ~  9
+
+print rng1, "\n"
+print rng2, "\n"
+```
+> [1, 2, 3, 4, 5, 6, 7, 8, 9, 10]  
+> [1, 2, 3, 4, 5, 6, 7, 8, 9]
+
+```ruby
+# Array : reverse vs reverse!
+
+arr = [1, 2, 3]
+
+arr.reverse                                                 # not save
+print arr, "\n"
+
+arr.reverse!                                                # save
+print arr, "\n"
+```
+> [1, 2, 3]  
+> [3, 2, 1]
+
+```ruby
+# Symbol : similar with strings but immutable and faster
+
+str = "I"
+sym = :U
+str += "♥"
+# sym += "2"                                                # undefined method `+' for :U:Symbol (NoMethodError)
+print str
+print sym, "\n"
+```
+> I♥U
+
+```ruby
+# .times : an iterator for numbers
+
+10.times do
+    print "no"
+end
+print "\n"
+```
+> nononononononononono
+
+```ruby
+# Return : return the last line's evaluated result without return in UDF
+
+def Say()
+    a = "I hate you"
+    b = "You make me crazy"
+    c = "I want to leave you, but"
+    d = "I love you"
+end
+
+puts Say()
+```
+> I love you