diff --git a/.idea/.gitignore b/.idea/.gitignore
new file mode 100644
index 0000000..26d3352
--- /dev/null
+++ b/.idea/.gitignore
@@ -0,0 +1,3 @@
+# Default ignored files
+/shelf/
+/workspace.xml
diff --git a/.idea/coding-challenges.iml b/.idea/coding-challenges.iml
new file mode 100644
index 0000000..d6ebd48
--- /dev/null
+++ b/.idea/coding-challenges.iml
@@ -0,0 +1,9 @@
+
+
+
+
+
+
+
+
+
\ No newline at end of file
diff --git a/.idea/misc.xml b/.idea/misc.xml
new file mode 100644
index 0000000..639900d
--- /dev/null
+++ b/.idea/misc.xml
@@ -0,0 +1,6 @@
+
+
+
+
+
+
\ No newline at end of file
diff --git a/.idea/modules.xml b/.idea/modules.xml
new file mode 100644
index 0000000..1e88721
--- /dev/null
+++ b/.idea/modules.xml
@@ -0,0 +1,8 @@
+
+
+
+
+
+
+
+
\ No newline at end of file
diff --git a/.idea/vcs.xml b/.idea/vcs.xml
new file mode 100644
index 0000000..35eb1dd
--- /dev/null
+++ b/.idea/vcs.xml
@@ -0,0 +1,6 @@
+
+
+
+
+
+
\ No newline at end of file
diff --git a/README.md b/README.md
index debb56b..cf6c922 100644
--- a/README.md
+++ b/README.md
@@ -9,6 +9,18 @@ Create a function that receives an integers array and returns the number that ap
| (1,1,2) | 2 |
| (2,2,1) | 1 |
+fun OnlyOnce(var numbers: Array):Int{
+ foreach (i in numbers.size){
+ var x : Int
+ if (i == x){
+ //do nothing its existed
+ }
+ else{
+ return i
+ }
+ x = i
+ }
+}
## 2nd Challenge
Create a function that receives a string then it converts uppercase letters into lowercase and vice versa. The function then should print the converted value.
@@ -21,6 +33,14 @@ Create a function that receives a string then it converts uppercase letters into
| My name is Ali | mY NAME IS aLI |
| sHroog | ShROOG |
+fun Strings.toLowercase (val h :String ){
+ this.super()
+ if(h.char){}
+}
+
+
+
+
## 3rd Challenge
Create a function that receives an array of items & arrays and returns one flattened array with all items exluding null values.
@@ -33,6 +53,10 @@ Create a function that receives an array of items & arrays and returns one flatt
| 4 | [3, 5, [5, 9, 0]] | [3, 5, 5, 9, 0] |
+fun (array:Array):Array{
+return array.filter(Number)
+}
+
## 4th Challenge
Create a function that receives a string that contains combination of parentheses, square brackets, and curly braces. Then, it returns true if every opening bracket has a closing pair.
@@ -49,5 +73,11 @@ Create a function that receives a string that contains combination of parenthese
| {[(}]) | true |
| {[}]) | false |
-
+fun g (var g : String):Boolean{
+if (g.count > 1){
+return false
+}
+elseif(){
+}
+}