diff --git a/functions.js b/functions.js
index f6278ec..45556d1 100644
--- a/functions.js
+++ b/functions.js
@@ -1 +1,69 @@
 // YOUR CODE HERE
+//1. maxOrMin(num1, num2, max)
+function maxOrMin(num1, num2, max){
+  if(max){
+    if(num1 <= num2){
+      return num2;
+    }
+    else if(num2 <= num1){
+      return num1;
+    }
+  }
+  else if(num1<num2){
+    return num1;
+  }
+  else{return num2}
+  }
+  maxOrMin(2,22,true);
+
+//2. sillySum(arr)
+var array = [1,2,3];
+function sillySum(arr){
+var count =0;
+  for(var i =0; i <arr.length;i++){
+  count +=  (arr[i]*i);
+  }
+  return count;
+}
+sillySum(array);
+
+//3.numSquare(max)
+function numSquare(max) {
+  var sqArr = [];
+  for (i = 1; i * i <= max; i += 1) {
+    sqArr.push(i * i);
+  }
+  return sqArr;
+}
+numSquare(32);
+//4. isPrime(num)
+function isPrime(num) {
+  if (num < 2) {
+    return false;
+  }
+  for (var i = 2; i < num; i += 1) {
+    if (num % i === 0) {
+      return false;
+    }
+  }
+  return true;
+}
+
+isPrime(9); // returns false
+isPrime(7); // returns true
+
+// last. starter structure for our filter function
+var isOdd = function(num) {
+  return num % 2 !== 0;
+};
+var filter = function(arr, callback) {
+  var result = [];
+  arr.forEach(function(x){
+    if(callback(x)){
+      result.push(x);
+    }
+  });
+  return result;
+}
+
+filter([123,2345353,47,6867,754634524],isOdd);