Re factored callbacks to fit the testing suite. started tests

ryan-hamblin · ryan-hamblin · commit b4314efe1f6e · 2017-11-03T12:47:27.000-06:00
diff --git a/package-lock.json b/package-lock.json
diff --git a/src/callbacks.js b/src/callbacks.js
@@ -1,83 +1,43 @@
 /* eslint-disable */
 
-/*  For a portion of the assignment your job is to write functions
- *  so that each function invocation below works.  You're working backwards.
- *
- *  There are no tests for this file.
- *
- *  Example:
- *
- *  greeting('Hey guys', (message) => {
- *     console.log(message);
- *  });
- *
- *  You would then define the greeting function to make the invocation work.
- *
- *
- *  const greeting = (str, cb) => {
- *    cb(str);
- *  };
- *
- */
+const firstItem = (arr, cb) => {
+  // firstItem passes the first item of the given array to the callback function.
+};
 
-// Write a function called firstItem that passes the first item of the given array to the callback function
-// code here
+const getLength = (arr, cb) => {
+  // getLength passes the length of the array into the callback.
+};
 
-const foods = ['pineapple', 'mango', 'ribeye', 'curry', 'tacos', 'ribeye', 'mango'];
+const last = (arr, cb) => {
+  // last passes the last item of the array into the callback.
+};
 
-firstItem(foods, (firstItem) => {
-  console.log(`The first item is ${firstItem}.`);
-});
+const sumNums = (x, y, cb) => {
+  // sumNums adds two numbers (x, y) and passes the result to the callback.
+};
 
-// Write a function called getLength that passes the length of the array into the callback
-// code here
+const multiplyNums = (x, y, cb) => {
+  // multiplyNums multiplies two numbers and passes the result to the callback.
+};
 
-getLength(foods, (length) => {
-  console.log(`The length of the array is ${length}.`);
-});
+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.
+};
 
-// Write a function called last which passes the last item of the array into the callback
-// code here
-
-last(foods, (lastItem) => {
-  console.log(`The last item in the array is ${lastItem}.`);
-});
-
-// Write a function called sumNums that adds two numbers and passes the result to the callback
-// code here
-
-sumNums(5, 10, (sum) => {
-  console.log(`The sum is ${sum}.`);
-});
-
-// Write a function called multiplyNums that multiplies two numbers and passes the result to the callback
-// code here
-
-multiplyNums(5, 10, (product) => {
-  console.log(`The product is ${product}.`);
-});
-
-// Write a function called contains that checks if an item is present inside of the given array.
-// Pass true to the callback if it is, otherwise pass false
-// code here
-
-contains(foods, 'ribeye', (result) => {
-  console.log(result ? 'ribeye is in the array' : 'ribeye is not in the array');
-});
-
-// Write a function called removeDuplicates that removes all duplicate values from the given array.
-// Pass the array to the callback function.  Do not mutate the original array.
-// code here
-
-removeDuplicates(foods, (uniqueFoods) => {
-  console.log(`foods with duplicates removed: ${uniqueFoods}`);
-});
-
-// Write a function called forEach that iterates over the provided array and passes the value and index into the callback.
-// code here
-
-forEach(foods, (value, index) => {
-  console.log(`${value} is at index ${index}.`);
-});
+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.
+};
 
 /* eslint-enable */
+module.exports = {
+  firstItem,
+  getLength,
+  last,
+  sumNums,
+  multiplyNums,
+  contains,
+  removeDuplicates,
+};
diff --git a/tests/callbacks.test.js b/tests/callbacks.test.js
@@ -0,0 +1,22 @@
+const callBackMethods = require('../src/callbacks');
+/* eslint-disable no-undef */
+
+describe('callback functions', () => {
+  const listOfFood = [
+    'cheetoes',
+    'bananas',
+    'turkey leg',
+    'cobbler',
+    'bananas',
+  ];
+
+  describe('firstItem', () => {
+    it('should pass the first item in the list to callBack', () => {
+      let itemToTest;
+      callBackMethods.firstItem(listOfFood, (first) => {
+        itemToTest = first;
+      });
+      expect(itemToTest).toBe(listOfFood[0]);
+    });
+  });
+});
