Just another update

Task/Topic-variable/Clojure/topic-variable.clj

@@ -0,0 +1,6 @@
+user=> 3
+3
+user=> (Math/pow *1 2)
+9.0
+user=> (Math/pow *2 0.5)
+1.7320508075688772

Task/Topic-variable/J/topic-variable-2.j

@@ -0,0 +1,2 @@
+   (*:, %:) 3
+9 1.73205

Task/Topic-variable/Python/topic-variable.py

@@ -0,0 +1,5 @@
+>>> 3
+3
+>>> _*_, _**0.5
+(9, 1.7320508075688772)
+>>>

Task/Topic-variable/REXX/topic-variable.rexx

@@ -0,0 +1,6 @@
+/*REXX pgm shows something close to a "topic variable" (for funcs/subs).*/
+parse arg N                            /*get an arg from CL, maybe a 3? */
+say  mysub(N)   '  ◄───'               /*invoke a function to square it.*/
+exit                                   /*stick a fork in it, we're done.*/
+/*──────────────────────────────────MYSUB subroutine (function)─────────*/
+mysub:  return arg(1)**2               /*return the square of passed arg*/

Task/Topic-variable/Ruby/topic-variable-1.rb

@@ -0,0 +1,7 @@
+while DATA.gets     # assigns to $_ (local scope)
+  print             # If no arguments are given, prints $_
+end
+__END__
+This is line one
+This is line two
+This is line three

Task/Topic-variable/Ruby/topic-variable-2.rb

@@ -0,0 +1,4 @@
+DATA.gets
+p [$_.to_i ** 2, Math.sqrt($_.to_i)]        #=> [9, 1.7320508075688772]
+__END__
+3

Task/Topic-variable/Standard-ML/topic-variable.ml

@@ -0,0 +1,7 @@
+- 3.0;
+val it = 3.0 : real
+- it * it;
+val it = 9.0 : real
+- Math.sqrt it;
+val it = 3.0 : real
+-