diff --git a/README.md b/README.md
index 958568d..31fefa9 100644
--- a/README.md
+++ b/README.md
@@ -5,7 +5,14 @@
 Fork and clone this repo.
 
 	* Run the command `npm i` to install needed node packages.
+		* Done √
 	* Run the command `npm test` to run the tests.
+		* Done √
 	* Work through the files and make the tests pass.
+		* Done √
 	* Suggested order: `es6.js`, `arrays.js`, `objects.js`, `this.js`, `class.js`, `closure.js`, and then `recursion.js`.
+		* Done √
 	* Submit a pull request when you are finished and we will review your code.
+		* Done √
+
+Notes: Thank you. These are great test exercises. I feel pretty confident about my ability to solve them all. Still not 100% confident about matchingLeaves tho. I am looking fwd to revisiting these tests later in the course to check my retention of the material and incorporation of the more advanced techniques we are learning now and as ES7+ comes into the world. :)
diff --git a/package-lock.json b/package-lock.json
new file mode 100644
index 0000000..c5275d3
--- /dev/null
+++ b/package-lock.json
@@ -0,0 +1,2826 @@
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+      "integrity": "sha1-d3mLLaD5kQ1ZXxrOWwwiWFIfIdw=",
+      "dev": true
+    },
+    "webidl-conversions": {
+      "version": "4.0.1",
+      "resolved": "https://registry.npmjs.org/webidl-conversions/-/webidl-conversions-4.0.1.tgz",
+      "integrity": "sha1-gBWherg+fhsxFjhIas6B2mziBqA=",
+      "dev": true
+    },
+    "whatwg-encoding": {
+      "version": "1.0.1",
+      "resolved": "https://registry.npmjs.org/whatwg-encoding/-/whatwg-encoding-1.0.1.tgz",
+      "integrity": "sha1-PGxFGhmO567FWx7GHQkgxngBpfQ=",
+      "dev": true
+    },
+    "whatwg-url": {
+      "version": "4.8.0",
+      "resolved": "https://registry.npmjs.org/whatwg-url/-/whatwg-url-4.8.0.tgz",
+      "integrity": "sha1-0pgaqRSMHgCkHFphMRZqtGg7vMA=",
+      "dev": true,
+      "dependencies": {
+        "webidl-conversions": {
+          "version": "3.0.1",
+          "resolved": "https://registry.npmjs.org/webidl-conversions/-/webidl-conversions-3.0.1.tgz",
+          "integrity": "sha1-JFNCdeKnvGvnvIZhHMFq4KVlSHE=",
+          "dev": true
+        }
+      }
+    },
+    "which": {
+      "version": "1.2.14",
+      "resolved": "https://registry.npmjs.org/which/-/which-1.2.14.tgz",
+      "integrity": "sha1-mofEN48D6CfOyvGs31bHNsAcFOU=",
+      "dev": true
+    },
+    "which-module": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/which-module/-/which-module-1.0.0.tgz",
+      "integrity": "sha1-u6Y8qGGUiZT/MHc2CJ47lgJsKk8=",
+      "dev": true
+    },
+    "window-size": {
+      "version": "0.1.0",
+      "resolved": "https://registry.npmjs.org/window-size/-/window-size-0.1.0.tgz",
+      "integrity": "sha1-VDjNLqk7IC76Ohn+iIeu58lPnJ0=",
+      "dev": true,
+      "optional": true
+    },
+    "wordwrap": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/wordwrap/-/wordwrap-1.0.0.tgz",
+      "integrity": "sha1-J1hIEIkUVqQXHI0CJkQa3pDLyus=",
+      "dev": true
+    },
+    "worker-farm": {
+      "version": "1.4.1",
+      "resolved": "https://registry.npmjs.org/worker-farm/-/worker-farm-1.4.1.tgz",
+      "integrity": "sha512-tgFAtgOYLPutkAyzgpS6VJFL5HY+0ui1Tvua+fITgz8ByaJTMFGtazR6xxQfwfiAcbwE+2fLG/K49wc2TfwCNw==",
+      "dev": true
+    },
+    "wrap-ansi": {
+      "version": "2.1.0",
+      "resolved": "https://registry.npmjs.org/wrap-ansi/-/wrap-ansi-2.1.0.tgz",
+      "integrity": "sha1-2Pw9KE3QV5T+hJc8rs3Rz4JP3YU=",
+      "dev": true
+    },
+    "wrappy": {
+      "version": "1.0.2",
+      "resolved": "https://registry.npmjs.org/wrappy/-/wrappy-1.0.2.tgz",
+      "integrity": "sha1-tSQ9jz7BqjXxNkYFvA0QNuMKtp8=",
+      "dev": true
+    },
+    "write": {
+      "version": "0.2.1",
+      "resolved": "https://registry.npmjs.org/write/-/write-0.2.1.tgz",
+      "integrity": "sha1-X8A4KOJkzqP+kUVUdvejxWbLB1c=",
+      "dev": true
+    },
+    "xml-name-validator": {
+      "version": "2.0.1",
+      "resolved": "https://registry.npmjs.org/xml-name-validator/-/xml-name-validator-2.0.1.tgz",
+      "integrity": "sha1-TYuPHszTQZqjYgYb7O9RXh5VljU=",
+      "dev": true
+    },
+    "xtend": {
+      "version": "4.0.1",
+      "resolved": "https://registry.npmjs.org/xtend/-/xtend-4.0.1.tgz",
+      "integrity": "sha1-pcbVMr5lbiPbgg77lDofBJmNY68=",
+      "dev": true
+    },
+    "y18n": {
+      "version": "3.2.1",
+      "resolved": "https://registry.npmjs.org/y18n/-/y18n-3.2.1.tgz",
+      "integrity": "sha1-bRX7qITAhnnA136I53WegR4H+kE=",
+      "dev": true
+    },
+    "yargs": {
+      "version": "6.6.0",
+      "resolved": "https://registry.npmjs.org/yargs/-/yargs-6.6.0.tgz",
+      "integrity": "sha1-eC7CHvQDNF+DCoCMo9UTr1YGUgg=",
+      "dev": true,
+      "dependencies": {
+        "camelcase": {
+          "version": "3.0.0",
+          "resolved": "https://registry.npmjs.org/camelcase/-/camelcase-3.0.0.tgz",
+          "integrity": "sha1-MvxLn82vhF/N9+c7uXysImHwqwo=",
+          "dev": true
+        },
+        "cliui": {
+          "version": "3.2.0",
+          "resolved": "https://registry.npmjs.org/cliui/-/cliui-3.2.0.tgz",
+          "integrity": "sha1-EgYBU3qRbSmUD5NNo7SNWFo5IT0=",
+          "dev": true
+        }
+      }
+    },
+    "yargs-parser": {
+      "version": "4.2.1",
+      "resolved": "https://registry.npmjs.org/yargs-parser/-/yargs-parser-4.2.1.tgz",
+      "integrity": "sha1-KczqwNxPA8bIe0qfIX3RjJ90hxw=",
+      "dev": true,
+      "dependencies": {
+        "camelcase": {
+          "version": "3.0.0",
+          "resolved": "https://registry.npmjs.org/camelcase/-/camelcase-3.0.0.tgz",
+          "integrity": "sha1-MvxLn82vhF/N9+c7uXysImHwqwo=",
+          "dev": true
+        }
+      }
+    }
+  }
+}
diff --git a/poop.txt b/poop.txt
new file mode 100644
index 0000000..ed5fff8
--- /dev/null
+++ b/poop.txt
@@ -0,0 +1 @@
+Where the FUCK is our Lambda School SWAG?!?!?!?!?!?!?!?
diff --git a/src/arrays.js b/src/arrays.js
index f24d6ef..0364014 100644
--- a/src/arrays.js
+++ b/src/arrays.js
@@ -1,38 +1,200 @@
 // Complete the following functions.
 // These functions only need to work with arrays.
 
-
 const each = (elements, cb) => {
   // Iterates over a list of elements, yielding each in turn to the `cb` function.
   // This only needs to work with arrays.
   // based off http://underscorejs.org/#each
+  // Q: I AM CONFUSED, WHY DOES CB TAKE 2 PARAMETERS???
+  // A: somewhat arbitrary, discernable from the test suite
+  //    just emulating forEach and underscore's each
+
+  // version 1 √
+  for (let i = 0; i < elements.length; i++) {
+    cb(elements[i], i);
+  }
+
+  // version 2 - using forEach √
+  // elements.forEach((value, index) => {
+  //   cb(value, index);
+  // });
+
+  // version 3 - jsfiddle has underscore library √
+  // _.each(elements, (value, index) => {
+  //   cb(value, index);
+  // });
 };
 
 const map = (elements, cb) => {
   // Produces a new array of values by mapping each value in list through a transformation function (iteratee).
   // Return the new array.
+
+  // version 1 √
+  // // const newArray = new Array(); <--- no bueno syntax per linter
+  // const newArray = [];
+  // for (let i = 0; i < elements.length; i++) {
+  //   newArray.push(cb(elements[i]));
+  // }
+  // return newArray;
+
+  // version 2 √
+  // solution using previous function
+  const results = [];
+  each(elements, (item) => { // <---- Calls above "each" method *****************************
+    results.push(cb(item));
+  });
+  return results;
+
+  // version 3 √
+  // solution using map() - map returns a new array of elements
+  // return elements.map(cb);
 };
 
+// =============================================================
+// REDUCE SOLUTION modifying the parameter with a default value:
+// =============================================================
+// const reduce = (elements, cb, memo = elements.shift()) => {
+//   Combine all elements into a single value going from left to right.
+//   Elements will be passed one by one into `cb`.
+//   `memo` is the starting value.  If `memo` is undefined then make `elements[0]` the initial value.
+//
+//   version 1 √
+//   for (let i = 0; i < elements.length; i++) {
+//     memo = cb(memo, elements[i]);
+//   }
+//   return memo;
+//
+//   version 2 - NOPE
+//   using previous solutions
+//   return map(memo, cb);
+// };
+//
+// =======================================================
+// REDUCE SOLUTION NOT modifying parameter default values:
+// =======================================================
 const reduce = (elements, cb, memo) => {
   // Combine all elements into a single value going from left to right.
   // Elements will be passed one by one into `cb`.
   // `memo` is the starting value.  If `memo` is undefined then make `elements[0]` the initial value.
+
+  // version 1 √
+  // elements NOT passed into cb
+  // let sum;
+  // if (typeof (elements[0]) === 'number') {
+  //   sum = 0;
+  //   if (memo) sum = memo;
+  // } else if (typeof (elements[0]) === 'string') {
+  //   sum = '';
+  //   if (memo) sum = memo;
+  // }
+  // for (let i = 0; i < elements.length; i++) {
+  //   sum += elements[i];
+  // } return sum;
+
+  // version 2 √
+  // elements passed into cb
+  // let sum;
+  // if (typeof (elements[0]) === 'number') {
+  //   sum = 0;
+  //   if (memo) sum = memo;
+  // } else if (typeof (elements[0]) === 'string') {
+  //   sum = '';
+  //   if (memo) sum = memo;
+  // }
+  // for (let i = 0; i < elements.length; i++) {
+  //   sum = cb(sum, elements[i]);
+  // } return sum;
+
+  // version 3 - NOPE
+  // solution using reduce()
+  // const total = elements.reduce(cb, memo);
+  // return total;
+
+  // Karthik's version A: passing the 2nd test only, "should accept a memo argument" √
+  // each(elements, (elem) => {
+  //   memo = cb(memo, elem); // <-- returns a new memo which is used for the next callback
+  // });
+  // return memo;
+
+  // Karthik's version B: passes all tests √
+  // if (memo === undefined) {
+  //   memo = elements.shift(); // <--- removes first element from array and returns it to memo variable
+  // }
+  // each(elements, (elem) => {
+  //   memo = cb(memo, elem);
+  // });
+  // return memo;
+
+  // Karthik's version C: a better way √
+  let i = 0;
+  if (memo === undefined) {
+    memo = elements[0];
+    i = 1; // <--- starting at second item when no memo is passed in
+  }
+  for (; i < elements.length; i++) {
+    memo = cb(memo, elements[i]);
+  }
+  return memo;
+
+  // Ryan's solution √
+  // no string/number check, nice!
+  // if (memo === undefined) {
+  //   memo = elements[0];
+  //   for (let i = 1; i < elements.length; i++) {
+  //     memo = cb(memo, elements[i]);
+  //   }
+  //   return memo;
+  // }
+  // for (let i = 0; i < elements.length; i++) {
+  //   memo = cb(memo, elements[i]);
+  // }
+  // return memo;
 };
 
 const find = (elements, cb) => {
   // Look through each value in `elements` and pass each element to `cb`.
   // If `cb` returns `true` then return that element.
   // Return `undefined` if no elements pass the truth test.
+
+  // version 1 √
+  for (let i = 0; i < elements.length; i++) {
+    if (cb(elements[i]) === true) {
+      return elements[i];
+    }
+    // Q: why does uncommenting this return out make it fail?????
+    // return undefined;
+  }
 };
 
 const filter = (elements, cb) => {
   // Similar to `find` but you will return an array of all elements that passed the truth test
   // Return an empty array if no elements pass the truth test
+
+  // version 1 √
+  const trueArray = []; // ----> WHY ISN'T THIS let???
+  for (let i = 0; i < elements.length; i++) {
+    if (cb(elements[i]) === true) {
+      trueArray.push(elements[i]);
+    }
+  }
+  return trueArray;
 };
 
 const flatten = (elements) => {
   // Flattens a nested array (the nesting can be to any depth).
   // Example: flatten([1, [2], [3, [[4]]]]); => [1, 2, 3, 4];
+
+  // version 1 √
+  let flat = [];
+  for (let i = 0; i < elements.length; i++) {
+    // if (elements[i] instanceof Array) { // <---- Also works
+    if (Array.isArray(elements[i])) {
+      flat = flat.concat(flatten(elements[i]));
+    } else {
+      flat.push(elements[i]);
+    }
+  }
+  return flat;
 };
 
 /* eslint-enable no-unused-vars, max-len */
diff --git a/src/class.js b/src/class.js
index 8276e29..8052845 100644
--- a/src/class.js
+++ b/src/class.js
@@ -6,9 +6,17 @@
 // for a potential password that will be compared to the `password` property.
 // Return true if the potential password matches the `password` property.  Otherwise return false.
 
+class User {
+  constructor(options) {
+    this.email = options.email;
+    this.password = options.password;
+  }
+  comparePasswords(potentialPassword) {
+    return this.password === potentialPassword;
+  }
+}
 
-/* eslint-disable no-undef */ // Remove this comment once you write your classes.
-
+// /* eslint-disable no-undef */ // Remove this comment once you write your classes.
 
 // Create a class called `Animal` and a class called `Cat`.
 // `Cat` should extend the `Animal` class.
@@ -19,6 +27,32 @@
 // `meow` that should return the string `<name> meowed!` where `<name>` is the `name`
 // property set on the Cat instance.
 
+class Animal {
+  constructor(options) {
+    this.age = options.age;
+  }
+  growOlder() {
+    // return this.age + 1;
+    // return this.age++;
+    return ++this.age;
+  }
+}
+
+// vvv NOPE vvv Q: HOW TO SOLVE THIS USING PROTOTYPE?
+// const Cat = Object.create(Animal.prototype);
+// // Cat.prototype.name = this.name;
+// Cat.prototype.name = 'whiskers';
+// Cat.prototype.meow = () => `${this.name} meowed!`;
+
+class Cat extends Animal {
+  constructor(options) {
+    super(options);
+    this.name = options.name;
+  }
+  meow() {
+    return `${this.name} meowed!`;
+  }
+}
 
 module.exports = {
   User,
diff --git a/src/closure.js b/src/closure.js
index 4c98af0..483aa11 100644
--- a/src/closure.js
+++ b/src/closure.js
@@ -5,17 +5,93 @@ const counter = () => {
   // Example: const newCounter = counter();
   // newCounter(); // 1
   // newCounter(); // 2
+
+  // version 1 √
+  // let value = 0;
+  // const increment = () => value += 1;
+  // return increment;
+
+  // verion 2 √
+  // let value = 0;
+  // const increment = i => value += 1; // Interesting that this works - why?
+  // return increment;
+
+  // version 3 √
+  let value = 0;
+  return () => value += 1;
 };
 
 const counterFactory = () => {
   // Return an object that has two methods called `increment` and `decrement`.
   // `increment` should increment a counter variable in closure scope and return it.
   // `decrement` should decrement the counter variable and return it.
+
+  // version 1 √
+  let value = 0;
+  const obj = {
+    increment() { return value += 1; },
+    decrement() { return value -= 1; }
+  };
+  return obj;
+
+  // version 2 √
+  // let value = 0;
+  // return {
+  //   increment() { return value += 1; },
+  //   decrement() { return value -= 1; }
+  // };
+
+  // version 3 √
+  // let value = 0;
+  // return {
+  //   increment: () => value += 1,
+  //   decrement: () => value -= 1
+  // };
 };
 
 const limitFunctionCallCount = (cb, n) => {
   // Should return a function that invokes `cb`.
   // The returned function should only allow `cb` to be invoked `n` times.
+  //
+  // Ely and Sarah helped me in Slack, but i do not understand what's going on here
+  // I got the limitFuncCall example from the JS course with sayHi... but still not solid on my understanding
+
+  // version 1 √
+  let limit = 0;
+  return (...args) => {
+    limit++;
+    if (n > limit) {
+      // limit++; // <--- acts the same as limit++ before if eval
+      // console.log(limit);
+      return cb(...args);
+    }
+    return null; // <--- still not sure why we need to return null, just because the test is set up that way?
+  };
+
+  // Ely's solution √
+  // let limit = 0;
+  // const funcToReturn = (x, y, z) => {
+  //   if (limit < n) {
+  //     limit += 1;
+  //     return cb(x, y, z);
+  //   }
+  //   return null;
+  //   // return undefined;
+  // };
+  // return funcToReturn;
+
+  // Sarah's solution √
+  // let num = 0;
+  // return function inner(...args) {
+  //   num++;
+  //   if (num <= n) {
+  //     if (arguments.length) {
+  //       return cb(...args);
+  //     }
+  //     return cb();
+  //   }
+  //   return null;
+  // };
 };
 
 const cacheFunction = (cb) => {
@@ -25,6 +101,27 @@ const cacheFunction = (cb) => {
   // If the returned function is invoked with arguments that it has already seen
   // then it should return the cached result and not invoke `cb` again.
   // `cb` should only ever be invoked once for a given set of arguments.
+  const cache = {};
+
+  // version 1 - NOPE
+  // return (x) => {
+  //   // if there is already a cached cb(), then return it from
+  //   // the cache instead of executing the cb again
+  //   if (cache[x]) {
+  //     return cache[x];
+  //   }
+  //   // otherwise, put the cb(x) into the cache for later use
+  //   cache[x] = cb(x);
+  //   return cache[x];
+  // };
+
+  // version 2 √ - Not sure why the above doesn't work and this does
+  return (x) => {
+    if (x in cache) {
+      return cache[x];
+    }
+    return cache[x] = cb(x);
+  };
 };
 
 /* eslint-enable no-unused-vars */
diff --git a/src/es6.js b/src/es6.js
index eb846ab..c694454 100644
--- a/src/es6.js
+++ b/src/es6.js
@@ -7,50 +7,84 @@
 //----------------
 // const, =>, default parameters, arrow functions default return statements using ()
 
-var food = 'pineapple';
+// var food = 'pineapple';
+//
+// var isMyFavoriteFood = function(food) {
+//   food = food || 'thousand-year-old egg'; //This sets a default value if `food` is falsey
+//   return food === 'thousand-year-old egg';
+// };
+//
+// var isThisMyFavorite = isMyFavoriteFood(food);
+const food = 'pineapple';
 
-var isMyFavoriteFood = function(food) {
-  food = food || 'thousand-year-old egg'; //This sets a default value if `food` is falsey
-  return food === 'thousand-year-old egg';
-};
-
-var isThisMyFavorite = isMyFavoriteFood(food);
+// const isMyFavoriteFood = (food = 'thousand-year-old egg') => food === 'thousand-year-old egg';
+// just double checking scope of keyword "food" & lintr doesn't like
+const isMyFavoriteFood = (foodItem = 'thousand-year-old egg') => foodItem === 'thousand-year-old egg';
+// False case
+const isThisMyFavorite = isMyFavoriteFood(food);
+console.log(isThisMyFavorite);
+// True case
+const egg = 'thousand-year-old egg';
+const thisIsMyFavorite = isMyFavoriteFood(egg);
+console.log(thisIsMyFavorite);
 
 //----------------
-//const, class, template literals, enhanced object literals (foo: foo, -> foo,)
-
-var User = function(options) {
-  this.username = options.username;
-  this.password = options.password;
-  this.sayHi = function() {
-    return this.username + ' says hello!';
-  };
+// const, class, template literals, enhanced object literals (foo: foo, -> foo,)
+
+// var User = function(options) {
+//   this.username = options.username;
+//   this.password = options.password;
+//   this.sayHi = function() {
+//     return this.username + ' says hello!';
+//   };
+// }
+//
+// var username = 'JavaScriptForever';
+// var password = 'password';
+//
+// var me = new User({
+//   username: username,
+//   password: password,
+// });
+
+class User {
+  constructor(options) {
+    this.username = options.username;
+    this.password = options.password;
+    this.sayHi = function () { // <--------------------------- Unexpected unnamed function
+      return `${this.username} says hello!`; // <--- template literals √
+    };
+  }
 }
 
-var username = 'JavaScriptForever';
-var password = 'password';
+const username = 'JavaScriptForever';
+const password = 'password';
 
-var me = new User({
-  username: username,
-  password: password,
+const me = new User({
+  username,                                  // <--- enhanced object literals √
+  password,                                  // <--- enhanced object literals √
 });
 
+console.log(me);
+
 // ----------------
 // let, const, =>, ... (spread operator)
 
-var addArgs = function () {
-  var sum = 0;
-  for (var i = 0; i < arguments.length; i++) {
-    sum += arguments[i];
+const addArgs = function (...args) { // <--------------------- Unexpected unnamed function
+  let sum = 0;
+  for (let i = 0; i < args.length; i++) {
+    sum += args[i];
   }
   return sum;
 };
 
-var argsToCb = function (cb) {
-  var args = Array.prototype.slice.call(arguments);
-  return cb.apply(null, args.splice(1));
+const argsToCb = function (cb) { // <------------------------ Unexpected unnamed function
+  const args = Array.prototype.slice.call(arguments); // <--- Use the rest parameters instead of 'arguments'
+  return cb.apply(null, args.splice(1)); // <---------------- Use the spread operator instead of '.apply()'
 };
 
-var result = argsToCb(addArgs, 1, 2, 3, 4, 5); //result should be 15
+const result = argsToCb(addArgs, 1, 2, 3, 4, 5); // result should be 15
+
+console.log(result);
 
 /* eslint-enable */
diff --git a/src/objects.js b/src/objects.js
index ba39c6c..1473c8f 100644
--- a/src/objects.js
+++ b/src/objects.js
@@ -5,34 +5,157 @@ const keys = (obj) => {
   // Retrieve all the names of the object's properties.
   // Return the keys as strings in an array.
   // Based on http://underscorejs.org/#keys
+  return Object.keys(obj);
 };
 
 const values = (obj) => {
   // Return all of the values of the object's own properties.
   // Ignore functions
   // http://underscorejs.org/#values
+  return Object.values(obj);
 };
 
 const mapObject = (obj, cb) => {
   // Like map for arrays, but for objects. Transform the value of each property in turn.
   // http://underscorejs.org/#mapObject
+  //
+  // version 1 √
+  // // using previous functions to make array from all keys
+  // const keyArr = keys(obj);
+  // // using previous functions to make array from all values
+  // const valArr = values(obj);
+  // // apply callback function to each element in the array of values
+  // for (let i = 0; i < valArr.length; i++) {
+  //   valArr[i] = cb(valArr[i]);
+  // }
+  // // declare empty object
+  // const mappedObj = {};
+  // // use it to contain original keys mapped back to
+  // // previously corresponding, and now, modified values
+  // for (let i = 0; i < keyArr.length; i++) {
+  //   mappedObj[keyArr[i]] = valArr[i];
+  // }
+  // return mappedObj;
+
+  // version 2 - using forEach from Hamblin's 7/10 review √
+  // const newObj = {};
+  // Object.keys(obj).forEach((key) => {
+  //   newObj[key] = cb(obj[key]);
+  // });
+  // return newObj;
+
+  // version 3 - forEach using previous "each"
+  const newObj = {};
+  keys(obj).forEach((key) => {
+    newObj[key] = cb(obj[key]);
+  });
+  return newObj;
 };
 
 const pairs = (obj) => {
   // Convert an object into a list of [key, value] pairs.
   // http://underscorejs.org/#pairs
+  //
+  // version 1 √
+  // const keyArr = keys(obj);
+  // const valArr = values(obj);
+  // const pairArr = [];
+  // // prepare an array of empty array set to the length of the former object
+  // for (let i = 0; i < keyArr.length; i++) {
+  //   pairArr.push([]);
+  // }
+  // // populate nested arrays with object key:value pairs
+  // // such that key is [n][0] and value is [n][1]
+  // for (let i = 0; i < keyArr.length; i++) {
+  //   pairArr[i].push(keyArr[i]);
+  //   pairArr[i].push(valArr[i]);
+  // }
+  // return pairArr;
+
+  // version 2 - using forEach from Hamblin's 7/10 review √
+  // const newArr = [];
+  // Object.keys(obj).forEach((givenKey) => {
+  //   const tempArray = [];
+  //   tempArray.push(givenKey, obj[givenKey]);
+  //   newArr.push(tempArray);
+  // });
+  // return newArr;
+
+  // version 3 - using previous eys method √
+  const newArr = [];
+  keys(obj).forEach((givenKey) => {
+    const tempArray = [];
+    tempArray.push(givenKey, obj[givenKey]);
+    newArr.push(tempArray);
+  });
+  return newArr;
 };
 
 const invert = (obj) => {
   // 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
+  //
+  // version 1 √
+  const keyArr = keys(obj);
+  const valArr = values(obj);
+  const mappedObj = {};
+  for (let i = 0; i < keyArr.length; i++) {
+    // {key:value} inverted to {value:key}
+    mappedObj[valArr[i]] = keyArr[i];
+  }
+  return mappedObj;
+
+  // version 2 - using forEach from Hamblin's 7/10 review √
+  // const newObj = {};
+  // Object.keys(obj).forEach((givenKey) => {
+  //   newObj[obj[givenKey]] = givenKey;
+  // });
+  // return newObj;
+
+  // version 3 - using previous keys method √
+  // const newObj = {};
+  // keys(obj).forEach((givenKey) => {
+  //   newObj[obj[givenKey]] = givenKey;
+  // });
+  // return newObj;
 };
 
 const defaults = (obj, defaultProps) => {
   // Fill in undefined properties that match properties on the `defaultProps` parameter object.
   // Return `obj`.
   // http://underscorejs.org/#defaults
+
+  // version 1 √
+  // using previous keys method, turn defaultProps object into an array to iterate over
+  //
+  const dPKeys = keys(defaultProps);
+  for (let i = 0; i < dPKeys.length; i++) {
+    if (!obj[dPKeys[i]]) {
+      obj[dPKeys[i]] = defaultProps[dPKeys[i]];
+    }
+  }
+  return obj;
+
+  // version 2 √
+  // const dPKeys = Object.keys(defaultProps);
+  // dPKeys.forEach((value, i) => {
+  //   if (!obj[dPKeys[i]]) {
+  //     obj[dPKeys[i]] = defaultProps[dPKeys[i]];
+  //   }
+  // });
+  // return obj;
+
+  // version 3 - √
+  // worked out a solution with ELY
+  //
+  // const dPKeys = keys(defaultProps);
+  // dPKeys.forEach((value) => {
+  //   if (obj[value] === undefined) {
+  //     obj[value] = defaultProps[value];
+  //   }
+  // });
+  // return obj;
 };
 
 /* eslint-enable no-unused-vars */
diff --git a/src/recursion.js b/src/recursion.js
index a3e997e..cbf8b52 100644
--- a/src/recursion.js
+++ b/src/recursion.js
@@ -3,18 +3,112 @@
 const nFibonacci = (n) => {
   // fibonacci sequence: 1 2 3 5 8 13 ...
   // return the nth number in the sequence
+  // 1,   2,   3,   5,   8,   13,  21,  34,  etc... (Fibbonacci values)
+  // 1st, 2nd, 3rd, 4th, 5th, 6th, 7th, 8th, etc... [position, nth Fibbo #]
+
+  // version 1 √
+  if (n < 2) return 1; // <--------------------------- ***BASE CASE***
+  return nFibonacci(n - 2) + nFibonacci(n - 1); // <--- recursive call
+
+  // // version 1.1 - ternary √
+  // return (n < 2) ? 1 : nFibonacci(n - 2) + nFibonacci(n - 1);
+
+  // // version 2 - non-recursive √
+  // const fibArray = [1, 1];
+  // for (let i = 2; i <= n; i++) {
+  //   fibArray.push(fibArray[i - 2] + fibArray[i - 1]);
+  // }
+  // return fibArray[n];
 };
 
 const nFactorial = (n) => {
   // factorial example: !5 = 5 * 4 * 3 * 2 * 1
   // return the factorial of `n`
+
+  // // version 1 √
+  if (n === 1) return n;
+  return n * nFactorial(n - 1);
+
+  // // version 2: ternary solution √
+  // // declare variableName = ifCondition ? thenThis : otherwiseThat;
+  // const factorial = (n === 1) ? 1 : n * nFactorial(n - 1);
+  // return factorial;
+
+  // // version 2.1 √
+  // return (n === 1) ? n : n * nFactorial(n - 1);
+
+  // // version 3 non-recursive
+  // function nFactorial (num) {
+  //   let factorial = 1;
+  //   for (let i = 1; i <= num; i++) {
+  //     factorial *= i;
+  //   }
+  //   return factorial;
+  // }
 };
 
 const checkMatchingLeaves = (obj) => {
-  // return true if every property on `obj` is the same
+  //                                             { key: value, key:  vv value vv }
+  // INPUT: will either be a number or an object {   x:   1  ,   y: {key: value} }
+  //                                             typeof obj[y] >>> 'object'
+  // FUNCTION:
+  // leafValue
+  // recursive function()
+    // iterate over the keys on obj
+      // find first non object value         vvv    recursion    vvv
+      // if object[key] is an object, then checkMatchingLeaves(obj[key])
+      // if leafValue is undefined set it to obj[key]
+      // check if leafValue is equal to obj[key] - otherwise return false
+      // DEPTH FIRST SEARCH with recursion
+  // call recursive function()
+  // OUTPUT: return true if every property on `obj` is the same
   // otherwise return false
+
+  // version 1 √
+  // example nested object: const tree = { x: 1, y: 1, z: 1, xa: { xx: 1, xy: 1, xz: 1, zz: { a: { b: { z: 1, }, }, }, y: 2 }, };
+  // const tree1 = {
+  //   x: 1,
+  //   y: 1,
+  //   z: 1,
+  //   xa: {
+  //     xx: 1,
+  //     xy: 1,
+  //     xz: 1,
+  //     zz: {
+  //       a: {
+  //         b: {
+  //           z: 1,
+  //         },
+  //       },
+  //     },
+  //     y: 2
+  //   },
+  // };
+
+  // version 1 - Ben's solution √
+  let leafValue;
+  let leavesMatch = true;
+  const checkLeaf = (object) => {
+    Object.keys(object).forEach((key) => {
+      // if (leafValue === undefined && typeof key !== 'object') {
+      if (leafValue === undefined && key instanceof Object !== true) {
+        leafValue = object[key];
+        return undefined;
+      }
+      // if (typeof object[key] === 'object') return checkLeaf(object[key]); // <--- recursive
+      if (object[key] instanceof Object === true) return checkLeaf(object[key]); // <--- recursive
+      if (object[key] !== leafValue) {
+        leavesMatch = false;
+        return undefined;
+      }
+      return undefined;
+    });
+  };
+  checkLeaf(obj);
+  return leavesMatch;
 };
 
+
 /* eslint-enable no-unused-vars */
 
 module.exports = {
diff --git a/src/this.js b/src/this.js
index 8ea3020..1bf6f5d 100644
--- a/src/this.js
+++ b/src/this.js
@@ -1,3 +1,5 @@
+/* eslint-disable */
+
 // Follow the instructions and fill in the blank sections.
 // There are no tests for this file.
 // To verify your code works you can run this file using `node this.js` while in the `/src` folder
@@ -5,27 +7,41 @@
 class User {
   constructor(options) {
     // set a username and password property on the user object that is created
+    this.username = options.username;
+    this.password = options.password;
   }
   // create a method on the User class called `checkPassword`
   // this method should take in a string and compare it to the object's password property
   // return `true` if they match, otherwise return `false`
+  checkPwd(compareString) {
+    return compareString === this.password;
+  }
 }
 
 const me = new User({ username: 'LambdaSchool', password: 'correcthorsebatterystaple' });
-const result = me.checkPassword('correcthorsebatterystaple'); // should return `true`
+// true case
+const result = me.checkPwd('correcthorsebatterystaple'); // should return `true`
+console.log(result);// ---> true
+// false case
+const falseResult = me.checkPwd('staplehorsecorrectbattery'); // should return `false`
+console.log(falseResult);// ---> false
+
 
 const checkPassword = function comparePasswords(passwordToCompare) {
   // recreate the `checkPassword` method that you made on the `User` class
   // use `this` to access the object's `password` property.
   // do not modify this function's parameters
   // note that we use the `function` keyword and not `=>`
+  return this.password === passwordToCompare;
 };
 
 // invoke `checkPassword` on `me` by explicitly setting the `this` context
 // use .call, .apply, and .bind
 
 // .call
-
+console.log(checkPassword.call(me, 'correcthorsebatterystaple')); // --> true
 // .apply
-
+console.log(checkPassword.apply(me, ['correcthorsebatterystaple'])); // --> true
 // .bind
+const bindCheck = checkPassword.bind(me);
+console.log(bindCheck('correcthorsebatterystaple')); // --> true