Update README.md

Author: ironhack-edu

README.md

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 # LAB | JS Functions & Arrays
 
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 ## Introduction
 
 Manipulating arrays in code is a very common operation. Whether you are creating a total for a shopping cart, grabbing only the first names out of a list of people, or moving a piece on a chessboard, you are probably going to be modifying or manipulating an array in some way.
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 Create Pull Request so your TAs can check up your work.
 
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 ## Automated Testing Introduction
 
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 ### What is automated testing?
 
 Automated software testing is the process of programmatically executing an application in order to validate and verify that it meets the business needs, as well as the technical requirements, and that it behaves as expected.
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 Having strong _test suites_ can provide you ease of mind, since you will be able to confidently improve upon your work while knowing that your not breaking a previously developed feature.
 
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 ### Testing labs
 
 This lab, along with some of the labs you will be working on during the bootcamp, has a complete test suite that is meant to ensure that your work fulfills the requirements we established.
 
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 ### Testing with Jest
 
 Jest is an automated test-runner for JavaScript.
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 Open the `lab-solution.html` file using the live server VSCode extension.
 
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 #### Pass the tests
 
 You should work on the `src/functions-and-arrays.js` file. While following the instructions for each iteration, you should check every test and make sure it's _passing_, before moving on.
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 Note that **you don't need to execute the functions yourself**, the tests are responsible for doing that. All you should do is declare them, make sure they deal with the parameters passed and that they return what is indicated on the iterations and in the test messages. For some iterations we provide you with a sample array, so that you can do some **manual** testing, if you wish.
 
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 ## Instructions
 
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 ### Iteration #1: Find the maximum
 
 Define a function `maxOfTwoNumbers` that takes two numbers as arguments and returns the largest.
 
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 ### Iteration #2: Find the longest word
 
 Declare a function named `findLongestWord` that takes as an argument an array of words and returns the longest one. If there are 2 with the same length, it should return the first occurrence.
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 const words = ['mystery', 'brother', 'aviator', 'crocodile', 'pearl', 'orchard', 'crackpot'];
 ```
 
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 ### Iteration #3: Calculate the sum
 
 Calculating a sum can be as simple as iterating over an array and adding each of the elements together.
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 const numbers = [6, 12, 1, 18, 13, 16, 2, 1, 8, 10];
 ```
 
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 #### Bonus - Iteration #3.1: A generic `sum()` function
 
 **The goal: Learn how to refactor your code.** :muscle:
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 // should return: 57
 ```
 
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 ### Iteration #4: Calculate the average
 
 Calculating an average is an extremely common task. Let's practice it a bit.
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 1. Find the sum as we did in the first exercise (or how about reusing that the _sumNumbers()_?)
 2. Take that sum and divide it by the number of elements in the list.
 
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 #### Level 1: Array of numbers
 
 Declare a function named `averageNumbers` that expects an array of numbers and returns the average of the numbers:
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 const numbers = [2, 6, 9, 10, 7, 4, 1, 9];
 ```
 
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 #### Level 2: Array of strings
 
 Declare a function named `averageWordLength` that receives as a single argument an array of words and returns the average length of the words:
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 const words = ['seat', 'correspond', 'linen', 'motif', 'hole', 'smell', 'smart', 'chaos', 'fuel', 'palace'];
 ```
 
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 #### Bonus - Iteration #4.1: A generic `avg()` function
 
 Create function `avg(arr)` that receives any mixed array and calculates average. Consider as mixed array an array filled with numbers and/or strings and/or booleans. We are following a similar logic to the one applied on the bonus iteration 4.1. :wink:
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 // should return: 5.7
 ```
 
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 ### Iteration #5: Unique arrays
 
 Take the following array, remove the duplicates, and return a new array. You are more than likely going to want to check out the [`indexOf`](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/indexOf) Array method.
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 ];
 ```
 
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 ### Iteration #6: Find elements
 
 Let's create a simple array search.
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 const words = ['machine', 'subset', 'trouble', 'starting', 'matter', 'eating', 'truth', 'disobedience'];
 ```
 
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 ### Iteration #7: Count repetition
 
 Declare a function named `howManyTimes` that will take in an array of words as the first argument, and a word to search for as the second argument. The function will return the number of times that word appears in the array.
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 ];
 ```
 
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 ### Bonus - Iteration #8: Product of adjacent numbers
 
 What is the greatest product of four adjacent numbers? We consider adjacent any four numbers that are next to each other horizontally or vertically.
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 ];
 ```
 
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 ### Bonus - Iteration #8.1: Product of diagonals
 
 Following the logic you've used in iteration #8, declare a function called `greatestProductOfDiagonals(matrix)`. It takes a matrix as a parameter and returns the greatest product of any four values layed out diagonally, in either direction.
 
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 **Happy coding!** :heart: