callbacks attempted

src/arrays.js

@@ -14,12 +14,26 @@ const each = (elements, cb) => {
   // This only needs to work with arrays.
   // You should also pass the index into `cb` as the second argument
   // based off http://underscorejs.org/#each
+  for (let i = 0; i < elements.length; i++) {
+    cb(elements[i], i);
+  }
+
+
+
+
+
+
 };
 
 const map = (elements, cb) => {
   // Do NOT use .map, to complete this function.
   // Produces a new array of values by mapping each value in list through a transformation function (iteratee).
   // Return the new array.
+  const NewArray = [];
+  for (let i = 0; i< elements.length; i++) {
+    newArray.push(cb(elements[i]))
+    return Array;
+  }
 };
 
 const reduce = (elements, cb, startingValue) => {
@@ -28,26 +42,68 @@ const reduce = (elements, cb, startingValue) => {
   // Elements will be passed one by one into `cb` along with the `startingValue`.
   // `startingValue` should be the first argument passed to `cb` and the array element should be the second argument.
   // `startingValue` is the starting value.  If `startingValue` is undefined then make `elements[0]` the initial value.
+  let startingIndex = 0;
+  if (startingValue = undefined) {
+    startingValue = elements[0];
+    startingIndex =1;
+  }
+  (let i = startingIndex; i < elements.length; i++) {
+    staringValue = cb(startingValue, elements[i]);
+  }
+  return startingValue;
+
 };
 
 const find = (elements, cb) => {
   // Do NOT use .includes, to complete this function.
   // 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.
+   for (let i = 0; i < elements.length; i++) {
+       if (cb(elements[i]) === true) {
+          return elements[i];
+        }
+      }
+      return undefined;
+
 };
 
 const filter = (elements, cb) => {
   // Do NOT use .filter, to complete this function.
   // 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
+  const newArray = [];
+  for (let i = 0; i < elements.length; i++) {
+    if (cb(elements[i])) {
+      newArray.push(elements[i]);
+    }
+  }
+  return newArray;
+
+
+
 };
 
 /* STRETCH PROBLEM */
 
 const flatten = (elements) => {
   // Flattens a nested array (the nesting can be to any depth).
   // Example: flatten([1, [2], [3, [[4]]]]); => [1, 2, 3, 4];
+   const flatArr = [];
+     for (let i = 0; i < arguments.length; i++) {
+       if (Array.isArray(elements[i])) {
+         flatArr.push(...flatten(elements[i]));
+       } else {
+         flatArr.push(elements[i]);
+       }
+     }
+     return flatArr;
+
+
+
+
+
+
 };
 
 /* eslint-enable no-unused-vars, max-len */

src/callbacks.js

@@ -1,26 +1,40 @@
 const firstItem = (arr, cb) => {
   // firstItem passes the first item of the given array to the callback function.
+  const name = arr[0];
+  cb(name);
 };
 
 const getLength = (arr, cb) => {
   // getLength passes the length of the array into the callback.
+  cb(arr.length);
 };
 
 const last = (arr, cb) => {
   // last passes the last item of the array into the callback.
+  cb(arr[arr.length - 1]);
 };
 
 const sumNums = (x, y, cb) => {
   // sumNums adds two numbers (x, y) and passes the result to the callback.
+  let sums = (x + y);
+  cb(sums)
 };
 
+
 const multiplyNums = (x, y, cb) => {
   // multiplyNums multiplies two numbers and passes the result to the callback.
+  let product = (x*y);
+  cb(product)
 };
 
 const contains = (item, list, cb) => {
   // contains checks if an item is present inside of the given array/list.
   // Pass true to the callback if it is, otherwise pass false.
+  for(let i = 0;) i < list.length; i++ {
+ if(item = item)
+ return true 
+ }
+ cb(item)
 };
 
 /* STRETCH PROBLEM */
@@ -29,6 +43,19 @@ const removeDuplicates = (array, cb) => {
   // removeDuplicates removes all duplicate values from the given array.
   // Pass the duplicate free array to the callback function.
   // Do not mutate the original array.
+  const newArr = [];
+   for (let i = 0; i < array.length; i++) {
+     if ( newArr.indexOf(array[i]) === -1) {
+       newArr.push(array[i]);
+     }
+   }
+  cb(newArr);
+
+
+
+
+
+
 };
 
 /* eslint-enable */

src/closure.js

@@ -5,17 +5,66 @@ const counter = () => {
   // Example: const newCounter = counter();
   // newCounter(); // 1
   // newCounter(); // 2
-};
+  let count = 0;
+  const newCounter = () => {
+    count++;
+    return count;
+  };
+  return newCounter;
+ };	
+
+
+
 
 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.
+  let count = 0;
+  return {
+    increment () {
+      count ++;
+      return count
+    } 
+    decrement( {
+      count++;
+      return 0 - count;
+    })
+  }
+
+
+
+
+
+  let nums = 0;
+  let newObject = {};
+  return newObject = {
+    increment: () => {
+      return nums += 1;
+    },
+    decrement: () => {
+      return nums -= 1;
+    },
+
+
+
+
 };
 
 const limitFunctionCallCount = (cb, n) => {
   // Should return a function that invokes `cb`.
   // The returned function should only allow `cb` to be invoked `n` times.
+  let count = n;
+  return (...args) => {
+    if (count > 0) {
+      --count;
+      return cb(...args);
+    }
+    return null;
+
+
+
+
 };
 
 /* STRETCH PROBLEM */
@@ -27,6 +76,17 @@ 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.
+  function cacheFunction(cb) {
+    return function (number) {
+      number + number;
+      return cb(number);
+    }
+}
+
+
+
+
+
 };
 
 /* eslint-enable no-unused-vars */

src/objects.js

@@ -5,22 +5,35 @@ 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
+  const newObj = {};
+  const key = Object.keys(obj);
+  for (let i = 0; i < key.length; i++) {
+    const newValue = cb(obj[key[i]]);
+    newObj[key[i]] = newValue;
+  }
+  return newObj;
 };
 
 const pairs = (obj) => {
   // Convert an object into a list of [key, value] pairs.
   // http://underscorejs.org/#pairs
+  return Object.entries(obj);
+
+
+
 };
 
 /* STRETCH PROBLEMS */
@@ -29,12 +42,24 @@ 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
+  const newObj = {};
+     Object.keys(obj).forEach(key => newObj[obj[key]] = key);
+      return newObj;
+   };		
+
 };
 
 const defaults = (obj, defaultProps) => {
   // Fill in undefined properties that match properties on the `defaultProps` parameter object.
   // Return `obj`.
   // http://underscorejs.org/#defaults
+  Object.keys(defaultProps).forEach((key) => {
+         if (obj[key] === undefined) {
+           obj[key] = defaultProps[key];
+         }
+       });
+       return obj;
+
 };
 
 /* eslint-enable no-unused-vars */