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Copy file name to clipboardExpand all lines: Week3/MAKEME.md
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-[Loops (for/while)](../fundamentals/loops.md)
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-[Functions](../fundamentals/functions.md)
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-[Scope](../fundamentals/scope.md)
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## Step 2: Watch
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1. If you haven't done already, watch: [What is programming](https://www.khanacademy.org/computing/computer-programming/programming/intro-to-programming/v/programming-intro)
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1. If you haven't done already, watch: [What is programming](https://www.khanacademy.org/computing/computer-programming/programming/intro-to-programming/v/programming-intro)
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Just watch the 2 min video, you do not have to do the entire JavaScript course (It could be useful later on though).
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2. Please watch the following parts of the course, [Programming Foundations Fundamentals](https://www.lynda.com/Programming-Foundations-tutorials/Welcome/83603/90426-4.html) on Lynda.com (if you don't have access to Lynda yet ask Gijs):
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2. Please watch the following parts of the course, [Programming Foundations Fundamentals](https://www.lynda.com/Programming-Foundations-tutorials/Welcome/83603/90426-4.html) on Lynda.com (if you don't have access to Lynda yet ask Gijs):
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<br>**4. Writing Conditional Code**
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<br>**5. Modular Code**
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<br>**6. Iteration: Writing Loops**
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<br>**7. More About Strings**
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<br>**8. Collections**
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<br>**11. When Things Go Wrong**
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<br>**11. When Things Go Wrong**
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## Step 3: Rover the Robot
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## Step 3: Rover the Robot
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Go and try out this cool game: [roverjs.com](http://roverjs.com), written by one of our HYF teachers, Joost Lubach. There are different levels, see how far you can get!
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Go and try out this cool game: [roverjs.com](http://roverjs.com), written by one of our HYF teachers, Joost Lubach. There are different levels, see how far you can get!
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## Step 4: String and Array challenges
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_Deadline Wednesday_
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_Deadline Wednesday_
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> For all the following exercises create a new .js file. Try to find a proper name for each file or make a small comment about what it does inside for future reference
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*IMPORTANT NOTE*
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In each assignment write at least two `console.log` statements to verify if your code works correctly. In other words proof that you code works as expected. If you need inspiration look at the steps defined in the assignments from last week.
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1\.**Strings!**
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1\.1 Let's consider the following string: `let myString = "hello,this,is,a,difficult,to,read,sentence"`
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1\.2 Add the string to your file and console.log it.
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1\.4 Console.log the length of `myString`.
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1\.5 The commas make that the sentence is quite hard to read. Find a way to remove the comma's from the sting and replace them with a spaces
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1\.6 Console.log `myString` to see if you succeeded.
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1\.**Strings!**
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1\.1 Let's consider the following string: `let myString = "hello,this,is,a,difficult,to,read,sentence"`
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1\.2 Add the string to your file and console.log it.
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1\.4 Console.log the length of `myString`.
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1\.5 The commas make that the sentence is quite hard to read. Find a way to remove the comma's from the sting and replace them with a spaces
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1\.6 Console.log `myString` to see if you succeeded.
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2\.**Arrays!**
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2\.**Arrays!**
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Consider the following array:
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```js
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let favoriteAnimals = ['blowfish', 'capricorn', 'giraffe'];
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```
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2\.1 Add a statement that adds Mauro's favorite animal ('turtle') to the existing array
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2\.2 Log your new array!
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2\.3 Now add Jim's favorite animal to the array, its a 'meerkat', but make sure it will be placed after 'blowfish' and before 'capricorn'.
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2\.4 Write a console.log statement that explains in words _you think_ the new value of the array is.
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2\.5 Log your new new array!
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2\.6 Log the length of the array, add a message: "The array has a length of: "(here you should show the length of the array)
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2\.7 Jason does not like giraffes, delete this animal from the array
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2\.8 Again log your new array.
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2\.9 Now if unlike Jim, you don't like meerkats and you want to delete it from the array, but you don't know the position or the `index` of the item in the array, how can you find it?
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2\.1 Add a statement that adds Mauro's favorite animal ('turtle') to the existing array
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2\.2 Log your new array!
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2\.3 Now add Jim's favorite animal to the array, its a 'meerkat', but make sure it will be placed after 'blowfish' and before 'capricorn'.
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2\.4 Write a console.log statement that explains in words _you think_ the new value of the array is.
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2\.5 Log your new new array!
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2\.6 Log the length of the array, add a message: "The array has a length of: "(here you should show the length of the array)
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2\.7 Jason does not like giraffes, delete this animal from the array
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2\.8 Again log your new array.
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2\.9 Now if unlike Jim, you don't like meerkats and you want to delete it from the array, but you don't know the position or the `index` of the item in the array, how can you find it?
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2\.10 Log the index of meerkat to the console. Add a message so it says: "The item you are looking for is at index: " (here you should show the index of the item)
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## More JavaScript :tada:
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14. Add a property to the object you just created that contains the languages that they have taught you.
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15. Write some code to test two arrays for equality using `==` and `===`. Test the following:
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```js
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let x = [1,2,3];
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let y = [1,2,3];
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let z = y;
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```
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What do you think will happen with `x == y`, `x === y` and `z == y` and `z == x`? Prove it!
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> Don't cheat! Seriously - try it first.
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Check out this [Fiddle](http://jsfiddle.net/jimschubert/85M4z/). You need to open your browser’s Developer Tools to see the console output. Press the Run button in the upper right corner to run the code.
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More insights from this [Stack Overflow question](http://stackoverflow.com/questions/22395357/how-to-compare-two-arrays-are-equal-using-javascript).
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16. Take a look at the following code:
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16. Take a look at the following code:
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```js
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let o1 = { foo:'bar' };
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```
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Show that changing `o2` changes `o3` (or not) and changing `o1` changes `o3`(or not).
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Show that changing `o2` changes `o3` (or not) and changing `o1` changes `o3`(or not).
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Does the order that you assign (`o3 = o2` or `o2 = o3`) matter?
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17. What does the following code return? (And why?)
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```js
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let bar = 42;
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let bar = 42;
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typeof typeof bar;
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```
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> ‘Coerce' means to try to change - so coercing `var x = '6'` to number means trying to change the type to number temporarily.
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> ‘Coerce' means to try to change - so coercing `var x = '6'` to number means trying to change the type to number temporarily.
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