diff --git a/RGTichy/.DS_Store b/RGTichy/.DS_Store
index 61e1c2a..cd2cba4 100644
Binary files a/RGTichy/.DS_Store and b/RGTichy/.DS_Store differ
diff --git a/RGTichy/arrayRemoveDuplicates copy.js b/RGTichy/arrayRemoveDuplicates copy.js
index c92f465..9505eee 100644
--- a/RGTichy/arrayRemoveDuplicates copy.js	
+++ b/RGTichy/arrayRemoveDuplicates copy.js	
@@ -1,24 +1,29 @@
 
 function arrayRemoveDuplicates(arr) {
-  var off=1;
-  for (var i = 0; i < arr.length; i++) {
-    console.log("Before: idx="+i+", off="+off+", arr="+arr)
-    if (arr[i] === arr[i + 1]|| arr[i] > arr[i+1]) {
-      arr[i+1]=arr[i+1+off];
-      off++;
-      i--;
-      console.log("After: idx="+i+", off="+off+", arr="+arr)
+  var offset = 1;
+  var i = 0;
+    while (i < arr.length  && offset<arr.length) {
+      // console.log("i= "+i+",offset="+offset+", arr= ["+arr+"]")
+      if (arr[i] < arr[i + 1]) {
+        // console.log('advanced the index')
+        i++;
+      }
+      else {
+        // console.log("shift arr["+offset+"] to arr["+(i+1)+"]")
+        arr[i+1]=arr[offset];
+        offset++;
+      }
     }
-    else {
-      console.log("--moved forward on index")
-      off--;
+    if (arr[i]<arr[i+1]) {
+      i++;
     }
-  }
-  arr.length=arr.length-off;
+    console.log("i= "+i+",offset="+offset+", arr= ["+arr+"]")
+    arr.length=i+1;
 return(arr);
 }
-array=[3,3,4,5,6,6,6,7,7,8,9,10,10,10,10,'10','Pam',"Pam",'Robert'];
-//array=[3,3,4,4,4,5,5,5];
+array=[3,3,4,5,6,6,6,7,7,8,9,10,10,10,10];
 console.log(array);
-arrayRemoveDuplicates(array);
-console.log(array)
+console.log(arrayRemoveDuplicates(array));
+array=[3,3,4,5,6,6,6,7,7,8,9,10,10,10,11];
+console.log(array);
+console.log(arrayRemoveDuplicates(array));
diff --git a/RGTichy/ch4/arraysZip.js b/RGTichy/ch4/arraysZip.js
new file mode 100644
index 0000000..1375e92
--- /dev/null
+++ b/RGTichy/ch4/arraysZip.js
@@ -0,0 +1,13 @@
+function arraysZip(arr1,arr2) {
+  object={};
+  if (arr1.length == arr2.length) {
+    for (var i = 0; i < arr1.length; i++) {
+      object[arr1[i]]=arr2[i];
+    }
+  }
+  else {
+    console.log(arr1.length, arr2.length)
+  }
+return(object)
+}
+console.log(arraysZip([1,2,3,5],['a','d',16,'j']))
diff --git a/RGTichy/ch4/coinChangeWithObject.js b/RGTichy/ch4/coinChangeWithObject.js
new file mode 100644
index 0000000..039f479
--- /dev/null
+++ b/RGTichy/ch4/coinChangeWithObject.js
@@ -0,0 +1,19 @@
+function optimalPocket(amount) {
+  function fn(r,array) {
+    pocket[array[0]] = Math.floor(r/array[1]);
+    return(r % array[1]);
+  }
+  var coins = [['dollars',1.00],
+               ['half-dollars',0.50],
+               ['quarters',0.25],
+               ['dimes',0.10],
+               ['nickels',0.05],
+               ['pennies',0.01]
+              ];
+  var pocket = {};
+  for (var i = 0; i < coins.length; i++){
+    amount = fn(amount, coins[i]);
+  }
+  return(pocket);
+}
+console.log(optimalPocket(2.93))
diff --git a/RGTichy/ch4/commonSuffix2.js b/RGTichy/ch4/commonSuffix2.js
new file mode 100644
index 0000000..300a5b2
--- /dev/null
+++ b/RGTichy/ch4/commonSuffix2.js
@@ -0,0 +1,23 @@
+function rhymeFinder(array){
+  if(typeof array === "object" && array.length > 0){
+    var suffix = [];
+    var j = 1;
+    var match = true;
+    while (match) {
+      var letter = array[0].charAt(array[0].length - j);
+      for (var i = 1; i < array.length; i++) {
+        if(array[i].charAt(array[i].length - j) !== letter){
+          match = false;
+          break;
+        }
+      }
+      if(match){
+        suffix=letter+suffix;
+        j++;
+      }
+    }
+    return suffix;
+  }
+}
+var rhymeArray = ['book', 'look', 'shook', 'mistook', 'took'];
+console.log(rhymeFinder(rhymeArray));
diff --git a/RGTichy/ch4/invertHash.js b/RGTichy/ch4/invertHash.js
new file mode 100644
index 0000000..0ab2ee6
--- /dev/null
+++ b/RGTichy/ch4/invertHash.js
@@ -0,0 +1,11 @@
+function invertHash(obj1) {
+  obj2 = {};
+  // for "each key" in object obj1,
+  // flip the value/key pair and write
+  //them into obj2
+  for (key in obj1) {
+    obj2[ obj1[key] ] = key;
+  }
+  return(obj2)
+}
+console.log(invertHash({'A':1,'B':2,'C':4}))
diff --git a/RGTichy/ch4/maxMinAvgwithObject.js b/RGTichy/ch4/maxMinAvgwithObject.js
new file mode 100644
index 0000000..6242e22
--- /dev/null
+++ b/RGTichy/ch4/maxMinAvgwithObject.js
@@ -0,0 +1,21 @@
+function maxMinAvgObject(array) {
+  var object = {};
+  var min = array[0];
+  var max = array[0];
+  var avg = 0;
+  var sArray=[];
+  for (var i = 0; i < array.length; i++){
+    avg = avg + array[i];
+    if (array[i] < min) {min = array[i];}
+    if (array[i] > max) {max = array[i];}
+    sArray.push(array[i]);
+  }
+  avg = avg / (array.length);
+  object['maximum']=max;
+  object['minimum']=min;
+  object['average']=avg;
+  sArray.sort();
+  object['median']=array[Math.floor(sArray.length/2)];
+  return(object);
+}
+console.log(maxMinAvgObject([4,6,1,8,1,2,4,3,2,1,4,8,95,70,32]))
diff --git a/RGTichy/ch4/numberOfValues.js b/RGTichy/ch4/numberOfValues.js
new file mode 100644
index 0000000..bc3e347
--- /dev/null
+++ b/RGTichy/ch4/numberOfValues.js
@@ -0,0 +1,14 @@
+function numberOfValues(obj) {
+  var size = 0;
+  for (key in obj) {
+    size++;
+  }
+  return(size);
+}
+console.log(numberOfValues({
+  a:1,
+  32768:2,
+  ama:'zing',
+  g:7,
+  14:19,
+}))