review update

mkruijt · mkruijt · commit e4803e20bc64 · 2017-09-04T18:28:12.000+02:00
diff --git a/Week1/REVIEW.md b/Week1/REVIEW.md
@@ -95,14 +95,14 @@ To get the type of a variable, use the following code:
 
 ```js
 let x = 5;
-let typeOfX = typeof x; // -> "number"
+let typeOfX = typeof x; // -> 'number'
 ```
 
 Note that I've put an asterisk behind 'array'. That is because in JavaScript, array is a special kind of object:
 
 ```js
 let arr = [1, 2, 3];
-let typeOfArr = typeof arr; // -> "object"
+let typeOfArr = typeof arr; // -> 'object'
 ```
 
 However, in our communication, we will call these variables arrays.
@@ -115,16 +115,54 @@ Whenever you declare a variable, but you don't set a value, the variable will be
 
 ```js
 let x;
-console.log(typeof x); // -> "undefined"
+console.log(typeof x); // -> 'undefined'
 ```
 
+
+### Typeof
+
+You can use `typeof` to get the type of a certain variable as you have seen in the above section 'Variable types'. As you can see in the following examples it returns the type of data that you have stored in your variable. 
+
 ## Strings
 
->TODO
+In JavaScript you can store a series of characters inside a variable, you then call this a string. You can store all sorts of characters (text/numbers, spaces or phrases) in strings. By using the `''` you define that something is a string. You can also use `""` to create a string. Both are fine as long as you are consistent (just make a choice on which one you prefer and stick to it).
+
+```js
+let foo = '42';
+typeof foo   //-> 'string'
+
+let bar = 'I\'m 99 years old '; 
+typeof bar   //-> 'string'
+```
+
+### String indexes and string properties
+The index of a string always starts at 0.
+Strings also have properties, for example `.length` you can use this to find the length of a string.
+
+So for example:
+```js
+let baz = 'Hello World';
+baz[0]; //-> "H"
+baz.length; //-> 11
+```
+
+### String methods
+
+>Todo
 
 ## Numbers
 
->TODO
+All numbers in JavaScript are considered numbers with or without decimal
+
+```js
+let quux = 42;    
+typeof quux  //-> 'number'
+
+let quuux = 3.3333;
+typeof quuux //-> 'number'
+
+```
+
 
 ## Arrays
 
diff --git a/Week2/MAKEME.md b/Week2/MAKEME.md
@@ -1,5 +1,7 @@
 ## Homework Week 2
 
+>[Here](https://github.com/HackYourFuture/JavaScript/tree/master/Week2/README.md) you find the readings you have to complete before the third lecture.
+
 ### Step 1: Recap/Read
 
 - Have a look at [The Secret Life of JavaScript Primitives](https://javascriptweblog.wordpress.com/2010/09/27/the-secret-life-of-javascript-primitives/)
@@ -49,7 +51,9 @@ if (3 == 3) {
 
 11. What if you add one more vehicle to the list, can you have that added to the advertisement without changing the code for question 8?
 
-12. Create a function that takes two objects as parameters and compares them. You will actually need to write two functions — one that compares with `==` and one that compares with `===`. Remember that objects can have objects inside of them so you'll need to find a way to compare every element of every object (types and values). For example: 
+12. Create an empty object
+
+13. Create a function that takes two objects as parameters and compares them. You will actually need to write two functions — one that compares with `==` and one that compares with `===`. Remember that objects can have objects inside of them so you'll need to find a way to compare every element of every object (types and values). For example: 
 
 ```js
     var obj1 = {
@@ -73,7 +77,7 @@ if (3 == 3) {
     
     Note: give this exercise your best shot but don’t spend more than, say, one hour on it.
 
-13. We saw that we can pass functions as arguments to other functions. Your task is to write a function that takes another function as an argument and runs it. 
+14. We saw that we can pass functions as arguments to other functions. Your task is to write a function that takes another function as an argument and runs it. 
 
 ```js
     function foo(func) {
@@ -88,7 +92,7 @@ if (3 == 3) {
 ```
 
 
-14. Write some code to test two arrays for equality using `==` and `===`. Test the following:
+15. Write some code to test two arrays for equality using `==` and `===`. Test the following:
     
 ```js
     var x = [1,2,3];
@@ -106,7 +110,7 @@ Check out this [Fiddle](http://jsfiddle.net/jimschubert/85M4z/). You need to ope
 More insights from this [Stack Overflow question](http://stackoverflow.com/questions/22395357/how-to-compare-two-arrays-are-equal-using-javascript).
 
 
-14. Take a look at the following code: 
+16. Take a look at the following code: 
 
 ```js
      var o1 = { foo: 'bar' };
@@ -119,6 +123,12 @@ More insights from this [Stack Overflow question](http://stackoverflow.com/quest
     
     Does the order that you assign (`o3 = o2` or `o2 = o3`) matter? {Jim Cramer: ???}
 
+17. What does the following code return? (And why?)
+```js
+let bar = 42; 
+typeof typeof bar;
+```
+
  
 > ‘Coerce' means to try to change - so coercing `var x = '6'` to number means trying to change the type to number temporarily. 
 
diff --git a/Week2/README.md b/Week2/README.md
@@ -13,8 +13,10 @@ In week three we will discuss the following topics:
 ### Here are resources that we like you to read as a preparation for the coming lecture. 
 
 - Closures: http://javascriptissexy.com/understand-javascript-closures-with-ease/
+- https://developer.mozilla.org/en/docs/Web/JavaScript/Closures
 - [Array](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/prototype)
 
+
 Refresher:
 * Objects (*important to really understand them, read this if you are unsure! You may also read chapters 72, 73 and 74 if you have time and want to learn more*):</br>
 Chapters 70-71, 75
diff --git a/Week2/REVIEW.md b/Week2/REVIEW.md
@@ -2,6 +2,8 @@
 
 ```
 This review covers:
+• Recap Logical operators
+• Typeof
 • Loops (for/while)
 • Functions 
 • Advanced data types [Objects]  
@@ -31,6 +33,27 @@ This review covers:
 |0|0|1|
 |1|1|1|
 
+So you can say that false in combination with `&&` always returns true
+```js
+true && false //-> false
+false && true //-> false
+false || true //-> true
+true || false //-> true
+```
+
+### Typeof
+
+`typeof` always returns the data type in a string. 
+
+So for example:
+```js
+let bar = 42; 
+typeof bar    //-> 'number' 
+typeof typeof bar; //->  'string'
+```
+
+So the data type of what `typeof` returns is always a string, bar on the other hand is still a number.
+
 ## Objects
 
 Variables that are objects also contain a list of things, but instead of them being in some specific order, they can be assigned to words, called "keys". Instead of "elements" the things that are inside objects are called "properties".
diff --git a/Week3/MAKEME.md b/Week3/MAKEME.md
@@ -1,24 +1,12 @@
-# Homework Week 3
-
-## Read:
-- https://github.com/HackYourFuture/JavaScript/blob/master/Week3/README.md
-
-## Challenges:
-- https://www.freecodecamp.com/challenges/declare-javascript-objects-as-variables
-- https://www.freecodecamp.com/challenges/make-instances-of-objects-with-a-constructor-function
-- https://www.freecodecamp.com/challenges/make-unique-objects-by-passing-parameters-to-our-constructor
-- https://www.freecodecamp.com/challenges/make-object-properties-private
-
-Loops practice - https://www.freecodecamp.com/challenges/iterate-with-javascript-for-loops
-https://www.freecodecamp.com/challenges/iterate-with-javascript-while-loops
-https://developer.mozilla.org/en/docs/Web/JavaScript/Closures
-
-And just for fun ... https://www.freecodecamp.com/challenges/sum-all-numbers-in-a-range
+## Homework Week 3
 
+>[Here](https://github.com/HackYourFuture/JavaScript/tree/master/Week3/README.md) you find the readings you have to complete before the fourth lecture.
 
+### Step 1: Recap/Read
 
+### Step 2: Watch
 
-## And a custom DOM manipulation challenge :mortar_board:
+### Step 3: Custom DOM manipulation challenge :mortar_board:
 
 1. Open a new js file and start by declaring in array with in there 10 strings. These strings should be of book title's you have read (or made up) and be lowercase without spaces or special characters so that you can use these later as Id's. (Example: Harry Potter's - The Chamber of Secrets -> `harry_potter_chamber_secrets`). 
 
@@ -33,3 +21,13 @@ And just for fun ... https://www.freecodecamp.com/challenges/sum-all-numbers-in-
 6. Beautify your html page with css, add sources and alts to each of the images.
  
 7. __Optional (expert)__ Download book covers for each book, construct a new Object which has as keys the bookId's again, and as value the path to the image source (e.g. `{"harry_potter_blabla": "./img/harry_potter_blabla.jpg", ...}`). Now loop over these entries (_hint: `Object.keys(objectName)` gives you an array containing the keys_). Then write a function which places an image at the corresponding `li` element. Remember that Objects are not ordered, so you cannot guarantee that the first key is the first `li` element. (_Hint: you could give each `li` item an `id` tag by modifying the function you made before_)
+
+### Step 4: **FreeCodeCamp challenges:**
+
+- https://www.freecodecamp.com/challenges/declare-javascript-objects-as-variables
+- https://www.freecodecamp.com/challenges/make-instances-of-objects-with-a-constructor-function
+- https://www.freecodecamp.com/challenges/make-unique-objects-by-passing-parameters-to-our-constructor
+- https://www.freecodecamp.com/challenges/make-object-properties-private
+
+
+And just for fun ... https://www.freecodecamp.com/challenges/sum-all-numbers-in-a-range
