diff --git a/calculateFrequency.js b/calculateFrequency.js
new file mode 100644
index 0000000..c31ec68
--- /dev/null
+++ b/calculateFrequency.js
@@ -0,0 +1,15 @@
+function calculateFrequency(string) {
+  let toReturn = {};
+  for (let i = 0; i < string.length; i++) {
+    if (string.charCodeAt(i) > 96 && string.charCodeAt(i) < 123) {
+      toReturn[string.charAt(i)] = 0;
+    }
+  }
+  for (let i = 0; i < string.length; i++) {
+    if (string.charCodeAt(i) > 96 && string.charCodeAt(i) < 123) {
+      toReturn[string.charAt(i)] = toReturn[string.charAt(i)] + 1;
+    }
+  }
+  return toReturn;
+}
+
diff --git a/flatten.js b/flatten.js
new file mode 100644
index 0000000..cf09839
--- /dev/null
+++ b/flatten.js
@@ -0,0 +1,16 @@
+function flatten(unflatObject) {
+  var toReturn = {},
+    count = 0;
+  for (var i in unflatObject) {
+    if ((typeof unflatObject[i]) == 'object') {
+      var flatObject = flatten(unflatObject[i]);
+      for (var x in flatObject) {
+        toReturn[i + '.' + x] = flatObject[x];
+      }
+    } else {
+      toReturn[i] = unflatObject[i];
+    }
+  }
+  return toReturn;
+}
+
diff --git a/readme.txt b/readme.txt
deleted file mode 100644
index e69de29..0000000
diff --git a/secondLargest.js b/secondLargest.js
new file mode 100644
index 0000000..cf63a2c
--- /dev/null
+++ b/secondLargest.js
@@ -0,0 +1,25 @@
+function secondLargest(array) {
+  let v = [];
+  v.length = 1000;
+  for (let i = 0; i < v.length; i++) {
+    v[i] = 0;
+  }
+  len = array.length;
+  for (let i = 0; i < array.length; i++) {
+    if (v[array[i]] == 1) {
+      len = len - 1;
+    } else {
+      v[array[i]] = 1;
+    }
+  }
+  let i = 0,
+    count = 0;
+  while (count < len - 1) {
+    if (v[i] == 1) {
+      count = count + 1;
+    }
+    i++;
+  }
+  return i - 1;
+}
+
diff --git a/unflatten.js b/unflatten.js
new file mode 100644
index 0000000..ed53293
--- /dev/null
+++ b/unflatten.js
@@ -0,0 +1,30 @@
+function unflatten(flatObject) {
+  temp = {};
+  for (var key in flatObject) {
+    array = key.split('.');
+    var ret = function (obj, array, count) {
+      if (count < array.length - 1) {
+        if (typeof obj[array[count]] == 'object') {
+          obj[array[count]];
+          ret(obj[array[count]], array, count + 1);
+        }
+        else {
+          obj[array[count]] = {};
+          ret(obj[array[count]], array, count + 1);
+        }
+      }
+      else {
+        obj[array[count]] = flatObject[key];
+      }
+      return obj;
+    }
+    var extend = function (obj, src) {
+      for (var key in src) {
+        if (src.hasOwnProperty(key)) obj[key] = src[key];
+      }
+      return obj;
+    }
+    temp = extend(ret(temp, array, 0), temp);
+  }
+  return temp;
+}
\ No newline at end of file