Julia samples (#108)

* Add julialang binary search sample

* Add unit test

* Add julialang selection sort sample

* Change julia suffix to jl

* Add recursion and quick sort with tests

* add quick sort

* Add hash table samples

* Add BFS

* Changed file names

* Add dijkstras

* Add Dijkstras test

03_recursion/julia/01_countdown.jl

@@ -0,0 +1,24 @@
+using Test
+using Suppressor
+
+function countdown(i)
+    println(i)
+    if i <= 0
+        return
+    end
+    countdown(i-1)
+end
+
+result = @capture_out(countdown(10)) # return stdout result
+@test result == "10
+9
+8
+7
+6
+5
+4
+3
+2
+1
+0
+"

03_recursion/julia/02_greet.jl

@@ -0,0 +1,24 @@
+using Test
+using Suppressor
+
+function greet2(name)
+    println("how are you, ",name,"?")
+end
+
+function bye()
+    println("ok bye!")
+end
+
+function greet(name)
+    println("hello, ",name,"!")
+    greet2(name)
+    println("getting ready to say bye...")
+    bye()
+end
+
+result = @capture_out greet("adit")
+@test result == "hello, adit!
+how are you, adit?
+getting ready to say bye...
+ok bye!
+"

03_recursion/julia/03_factorial.jl

@@ -0,0 +1,10 @@
+using Test
+
+function factorial(x)
+    if x == 1
+        return 1
+    end
+    return x * factorial(x-1)
+end
+
+@test factorial(5) == 120