JS-I project

package.json

@@ -22,11 +22,12 @@
     "babel-preset-env": "^1.6.1",
     "eslint": "^3.17.1",
     "eslint-config-airbnb-base": "^11.1.3",
-    "eslint-plugin-import": "^2.2.0",
+    "eslint-plugin-import": "^2.9.0",
     "jest": "^19.0.2",
     "regenerator-runtime": "^0.10.3"
   },
   "dependencies": {
-    "eslint-config-airbnb": "^14.1.0"
+    "eslint-config-airbnb": "^14.1.0",
+    "yarn": "^1.5.1"
   }
 }

src/arrays.js

@@ -14,12 +14,18 @@ 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 output = [];
+  each(elements, item => output.push(cb(item)));
+  return output;
 };
 
 const reduce = (elements, cb, startingValue) => {
@@ -28,19 +34,39 @@ 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.
+  const elementCopy = elements.slice();
+  let memo = startingValue || elementsCopy.shift();
+  each(elementsCopy, (item)=> {
+    memo = cb(memo, item);
+  });
+  return memo;
 };
 
 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.
+  // Return `undefined` if no elements pass the truth test
+  for (let i = 0; i < elements.length; i++) {
+    if (cb(elements[i])) {
+      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 result = [];
+  for (let i = 0; i < elements.length; i++) {
+    if (cb(elements[i])) {
+      result.push(elements[i]);
+    }
+  }
+  return result;
 };
 
 /* STRETCH PROBLEM */

src/callbacks.js

@@ -1,26 +1,32 @@
 const firstItem = (arr, cb) => {
   // firstItem passes the first item of the given array to the callback function.
+  cb(arr[0]);
 };
 
 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[-1]);
 };
 
 const sumNums = (x, y, cb) => {
   // sumNums adds two numbers (x, y) and passes the result to the callback.
+  cb(x + y);
 };
 
 const multiplyNums = (x, y, cb) => {
   // multiplyNums multiplies two numbers and passes the result to the callback.
+  cb(x * y);
 };
 
 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.
+  cb(list.includes(item));
 };
 
 /* STRETCH PROBLEM */

src/closure.js

@@ -5,17 +5,37 @@ const counter = () => {
   // Example: const newCounter = counter();
   // newCounter(); // 1
   // newCounter(); // 2
+  let count = 0;
+  function newCounter() {
+    count++;
+    return count;
+  }
 };
 
 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 count;
+  }
+ };
 
 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 = 0;
+  if (count < n) {
+    cb();
+    count++;
+  }
 };
 
 /* STRETCH PROBLEM */

src/objects.js

@@ -5,22 +5,28 @@ 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 props = Object.keys(obj);
+  for (let i = 0; i < keys; i++) {
+    cb(props[i]);
 };
 
 const pairs = (obj) => {
   // Convert an object into a list of [key, value] pairs.
   // http://underscorejs.org/#pairs
+  return Object.entries(obj);
 };
 
 /* STRETCH PROBLEMS */