diff --git a/lexm13.js b/lexm13.js
new file mode 100644
index 0000000..c3423a5
--- /dev/null
+++ b/lexm13.js
@@ -0,0 +1,133 @@
+// Tests for each function commented out below
+
+var testArr = [7, 13, 9, -3, 4, 22, -30];
+
+function Print1To255() {
+  for(var i = 1; i < 256; i++) {
+    console.log(i);
+  }
+}
+// Print1To255();
+
+function PrintIntsAndSum0To255() {
+  var sum = 0
+  for(var i = 1; i < 255; i++) {
+    sum += i;
+    console.log(i, sum);
+  }
+}
+// PrintIntsAndSum0To255();
+
+function PrintMaxOfArray(arr) {
+  var max = arr[0];
+  for(i = 1; i < arr.length; i++) {
+    if(max < arr[i]) {
+      max = arr[i];
+    }
+  }
+  console.log(max);
+}
+// PrintMaxOfArray(testArr);
+
+function ReturnOddsArray1To255() {
+  var result = new Array(128);
+  for(i = 0; i < 128; i++) {
+    result[i] = 2 * i + 1;
+  }
+  return result;
+}
+// var testArr = ReturnOddsArray1To255();
+// console.log(testArr[testArr.length -1]);
+
+function ReturnArrayCountGreaterThanY(arr, y) {
+  var count = 0;
+  for(i = 0; i < arr.length; i++) {
+    if(arr[i] > y) {
+      count++;
+    }
+  }
+  console.log(count);
+}
+// ReturnArrayCountGreaterThanY(testArr, 7);
+
+function PrintMaxMinAverageArrayVals(arr) {
+  var max = min = arr[0];
+  var sum = 0;
+  for(var i = 0; i < arr.length; i++) {
+    sum += arr[i];
+    if(arr[i] > max) {
+      max = arr[i];
+    } else if(arr[i] < min) {
+      min = arr[i];
+    }
+  }
+  console.log('max is ' + max);
+  console.log('min is ' + min);
+  console.log('mean is ' + (sum / arr.length));
+}
+// PrintMaxMinAverageArrayVals(testArr);
+
+function SwapStringForArrayNegativeValues(arr) {
+  for(var i = 0; i < arr.length; i++) {
+    if(arr[i] < 0) {
+      arr[i] = 'Dojo';
+    }
+  }
+}
+// SwapStringForArrayNegativeValues(testArr);
+// console.log(testArr);
+
+function PrintOdds1To255() {
+  for(var i = 1; i < 256; i += 2) {
+    console.log(i);
+  }
+}
+// PrintOdds1To255();
+
+function PrintArrayVals(arr) {
+  for(var i = 0; i < arr.length; i++) {
+    console.log(arr[i]);
+  }
+}
+// PrintArrayVals(testArr);
+
+function PrintAverageOfArray(arr) {
+  sum = 0;
+  for(var i = 0; i < arr.length; i++) {
+    sum += arr[i];
+  }
+  console.log(sum / arr.length);
+}
+// PrintAverageOfArray(testArr);
+
+function SquareArrayVals(arr) {
+  var newArr = [];
+  for(var i = 0; i < arr.length; i++) {
+    newArr[i] = Math.pow(arr[i], 2);
+  }
+  return newArr;
+}
+// console.log(SquareArrayVals(testArr));
+
+function ZeroOutNegativeNumbers(arr) {
+  var newArr = [];
+  for(var i = 0; i < arr.length; i++) {
+    if(arr[i] < 0) {
+      newArr[i] = 0;
+    } else {
+      newArr[i] = arr[i];
+    }
+  }
+  return newArr;
+}
+// console.log(ZeroOutNegativeNumbers(testArr));
+
+function ShiftArrayValsLeft(arr) {
+  var newArr = new Array(arr.length)
+  for(i = 1; i < arr.length; i++) {
+    newArr[i - 1] = arr[i]
+  }
+  newArr[arr.length - 1] = 0;
+  return newArr;
+}
+// console.log(ShiftArrayValsLeft(testArr));
diff --git a/lucky13.py b/lucky13.py
new file mode 100644
index 0000000..2d9917f
--- /dev/null
+++ b/lucky13.py
@@ -0,0 +1,99 @@
+test_list = [7,13.3,9,-3.25,4,22,-30]
+
+def print_1_to_255():
+    for i in range(1,255+1):
+        print i
+# print_1_to_255()
+
+def print_sum_ints_255():
+    sum = 0.0
+    for i in range(256):
+        sum += float(i)
+        print i, sum
+# print_sum_ints_255()
+
+def print_max_of_list(lst):
+    max = lst[0]
+    for i in range(1, len(lst)):
+        if float(lst[i]) > float(max):
+            max = lst[i]
+    print max
+# print_max_of_list(test_list)
+
+def odds_list_1_255():
+    result = []
+    for i in range(128):
+        result.append(2 * i + 1)
+    return result;
+# print odds_list_1_255()
+
+def list_count_greater(lst, y):
+    count = 0;
+    for i in range(len(lst)):
+        if float(lst[i]) > float(y):
+            count += 1
+    return count
+# print list_count_greater(test_list, 7)
+
+def max_min_avg(lst):
+    max = 0.0
+    min = 0.0
+    sum = 0.0
+    for i in range(len(lst)):
+        sum += float(lst[i])
+        if lst[i] > max:
+            max = float(lst[i])
+        elif lst[i] < min:
+            min = float(lst[i])
+    print "max is", max
+    print "min is", min
+    print "mean is", sum / len(lst)
+# max_min_avg(test_list)
+
+def swap_str_for_neg(lst, str):
+    for i in range(len(lst)):
+        if float(lst[i]) < 0.0:
+            lst[i] = str
+# swap_str_for_neg(test_list, "Dojo")
+# print test_list
+
+def odds_to_255():
+    for i in range(128):
+        print 2 * i + 1
+# odds_to_255()
+
+def print_list_vals(lst):
+    for val in lst:
+        print val
+# print_list_vals(test_list)
+
+def print_list_average(lst):
+    sum = 0.0
+    for val in lst:
+        sum += float(val)
+    print sum / len(lst)
+# print_list_average(test_list)
+
+def square_list_vals(lst):
+    res = []
+    for val in lst:
+        res.append(val * val)
+    return res
+# print square_list_vals(test_list)
+
+def zero_negatives(lst):
+    result = []
+    for val in lst:
+        if val < 0:
+            result.append(0)
+        else:
+            result.append(val)
+    return result
+# print zero_negatives(test_list)
+
+def shift_list_vals_left(lst):
+    result = []
+    for i in range(1, len(lst)):
+        result.append(lst[i])
+    return result
+# print shift_list_vals_left(test_list)