@@ -2,34 +2,75 @@
 // Reference http://underscorejs.org/ for examples.
 
 const keys = (obj) => {
+  return Object.getOwnPropertyNames(obj);
   // Retrieve all the names of the object's properties.
   // Return the keys as strings in an array.
   // Based on http://underscorejs.org/#keys
 };
 
 const values = (obj) => {
+  const tvalues = [];
+  const thekeys = keys(obj);
+  for (let i = 0; i < thekeys.length; i++) {
+    if (typeof (obj[thekeys[i]]) === 'function');
+    else {
+      tvalues.push(obj[thekeys[i]]);
+    }
+  }
+  return tvalues;
   // Return all of the values of the object's own properties.
   // Ignore functions
   // http://underscorejs.org/#values
 };
 
 const mapObject = (obj, cb) => {
+  const mappedobj = {};
+  const thekeys = keys(obj);
+  const thevalues = values(obj);
+  for (let i = 0; i < thekeys.length; i++) {
+    mappedobj[thekeys[i]] = cb(thevalues[i]);
+  }
+  return mappedobj;
   // Like map for arrays, but for objects. Transform the value of each property in turn.
   // http://underscorejs.org/#mapObject
 };
 
 const pairs = (obj) => {
+  const thekeys = keys(obj);
+  const thevalues = values(obj);
+  const pairarray = [];
+  for (let i = 0; i < thekeys.length; i++) {
+    pairarray.push([thekeys[i], thevalues[i]]);
+  }
+  return pairarray;
   // Convert an object into a list of [key, value] pairs.
   // http://underscorejs.org/#pairs
 };
 
 const invert = (obj) => {
+  const newobj = {};
+  const thekeys = keys(obj);
+  const thevalues = values(obj);
+  for (let i = 0; i < thekeys.length; i++) {
+    newobj[thevalues[i]] = thekeys[i];
+  }
+  return newobj;
   // Returns a copy of the object where the keys have become the values and the values the keys.
   // Assume that all of the object's values will be unique and string serializable.
   // http://underscorejs.org/#invert
 };
 
 const defaults = (obj, defaultProps) => {
+  const defaultkeys = keys(defaultProps);
+  const defaultvalues = values(defaultProps);
+  const thekeys = keys(obj);
+  for (let i = 0; i < defaultkeys.length; i++) {
+    if (Object.prototype.hasOwnProperty.call(obj, defaultkeys[i]));
+    else {
+      obj[defaultkeys[i]] = defaultvalues[i];
+    }
+  }
+  return obj;
   // Fill in undefined properties that match properties on the `defaultProps` parameter object.
   // Return `obj`.
   // http://underscorejs.org/#defaults