Develop

1. objects/1.md

@@ -1,73 +1,94 @@
 1. Pick a penguin from Wikipedia's List of Fictional Penguins (https://en.wikipedia.org/wiki/List_of_fictional_penguins) and create an object named `myPenguin` with properties that represent the information listed in each column on that Wikipedia page (for example: the character's name, origin, and author).
 
 ```js
-// your code goes here
+var myPenguin ={
+    name: "Whiteblack",
+    origin: "Whiteblack the Penguin sees the world",
+    author: "H.A. Rey and Margaret Rey",
+}
+
 ```
 
 2. Use console.log() to print the penguin's name to the console as part of a welcome message, like "Hello, I'm a penguin and my name is [NAME HERE]!"
 
 ```js
-// your code goes here
+console.log("Hello, I'm a Penguin and my name is " +  myPenguin.name);
 ```
 
 3. Write another line of code that adds a new property to your penguin called canFly and set it to false.
 
 ```js
-// your code goes here
+myPenguin.canFly = false;
 ```
 
 4. Add a method to your penguin called chirp that prints to the console: "CHIRP CHIRP! Is this what penguins sound like?"
 
 ```js
-// your code goes here
+myPenguin.chirp =  function() {
+    console.log("CHIP CHIRP! IS this what penguins sound like?");
+}
 ```
 
 6. Next, call your penguin's sayHello() method and make sure that it works!
 
 ```js
-// your code goes here
+
+
 ```
 
 7. Without modifying any of your previous code, change the penguin's name to "Penguin McPenguinFace" and then call your penguin's sayHello() function one more time to make sure it still works.
 
 ```js
-// your code goes here
+myPenguin.name = "Penguin McPenguinFace";
 ```
 
 8. Write another method called fly, and inside that method, use an if / else statement to print "I can fly!" to the console if your penguin's canFly property is true, or "No flying for me!" if its canFly property is false.
 
 ```js
-// your code goes here
+myPenguin.fly = function() {
+    if(myPenguin.canFly == true) {
+        console.log("I can fly!");
+    } else {
+        console.log("No flying for me!");
+    }
+}
+
 ```
 
 9. Call your penguin's fly() method and make sure it works!
 
 ```js
-// your code goes here
+myPenguin.fly();
 ```
 
 10. Change the canFly property to true -- again, without modifying any of your previous code!
 
 ```js
-// your code goes here
+myPenguin.canFly = true;
 ```
 
 11. Now call your penguin's fly() method again and make sure it works as expected!
 
 ```js
-// your code goes here
+myPenguin.fly();
 ```
 
 12. Write a for ... in loop to print each key to the console.
 
 ```js
-// your code goes here
+for(var i=0;i<myPenguin.length;i++) 
+{
+    console.log(myPenguin[i]);
+}
 ```
 
 13. Write another for ... in loop to print the value of each key to the console. (Hint: You'll need to use bracket notation to access the values this way, instead of dot notation!)
 
 ```js
-// your code goes here
+var i;
+for(i in myPenguin) {
+    console.log(myPenguin[i]);
+}
 ```
 
 ## Exercise 2
@@ -83,7 +104,18 @@
 ```
 
 ```js
-// your code goes here
+var recipe = {
+    title: "Mole",
+    servings: 2,
+    ingredients: ["cinnamon", "cumin", "cocoa"]
+}
+console.log(recipe.title);
+console.log("serves: " + recipe.servings);
+console.log("Ingrdients: ");
+for(var i=0;i<recipe.ingredients.length;i++)
+{
+    console.log(recipe.ingredients[i]);
+}
 ```
 
  15. Keep track of which books you read and which books you want to read!
@@ -93,5 +125,26 @@
  Now use an if/else statement to change the output depending on whether you read it yet or not. If you read it, log a string like 'You already read "The Hobbit" by J.R.R. Tolkien', and if not, log a string like 'You still need to read "The Lord of the Rings" by J.R.R. Tolkien.'
 
  ```js
-// your code goes here
+var books = [ {
+    title: "The Hobbit",
+    author: "J.R.R. Tolkien",
+    alreadyRead: false, 
+   }, {
+    title: "Harry Potter",
+    author: "J.K. Rowling",
+    alreadyRead: true,
+   }, {
+    title: "Inferno",
+    author: "Dan Brown",
+    alreadyRead: true,
+    } ]
+
+for(var i=0;i<books.length;i++) {
+    console.log(books[i].title + " by " + books[i].author);
+    if(books[i].alreadyRead==true) {
+        console.log("You already read " + books[i].title + " by " + books[i].author);
+    } else {
+        console.log("You still need to read the " + books[i].title + " by " + books[i].author);
+    }
+}
 ```

1. objects/2.js

@@ -21,3 +21,14 @@ var city = prompt("Enter the city name you visited las time.");
 // 9. Uisng console.log log the value of the key defined above.
 
 // 10. Can you define a key of `let or var` in any object? Reason.
+
+var user = {
+    "user name": "Black Panther",
+}
+console.log(user["user name"]);
+user[batch] = 10;
+alert(user[batch]);
+user[42] = "The answer to the meaning of life 🧸";
+console.log(user[42]);
+user[city] = true;
+console.log(user[city]);

2. array/1.md

@@ -1,71 +1,77 @@
 1. Create an array named colors that contains five different names of colors as strings.
 
 ```js
-// your code goes here
+var array = ["red", "blue", "yellow", "green", "blue"];
 ```
 
 2. Access the first color in the array and print it to the console using console.log()
 
 ```js
-// your code goes here
+console.log(array[0]);
 ```
 
 3.Now do the same with the third color in the list. (Remember that array indexes start at 0, not at 1!)
 
 ```js
-// your code goes here
+console.log(array[2]);
 ```
 
 4.Write one line of code that changes the value of the last color in the list to "ultraviolet" (overwriting the previous value).
 
 ```js
-// your code goes here
+array[array.length-1] = "ulraviolet";
 ```
 
 5. Create a new variable called fourthColor and set it equal to the fourth color in the list.
 
 ```js
-// your code goes here
+var fourthColor = array[3];
 ```
 
 6.Add another color to the end of the list.
 
 ```js
-// your code goes here
+array.push("purple");
 ```
 
 7.Add another color to the beginning of the list.
 
 ```js
 // your code goes here
+array.unshift("cyan");
 ```
 
 8. Print the length of the array to the console with console.log()
 
 ```js
-// your code goes here
+console.log(array.length);
 ```
 
 9.Remove the last color from the end of list, and then print the length of the array to the console one more time.
 
 ```js
-// your code goes here
+array.pop();
+
 ```
 
 10.Write a for loop to iterate through every color in the array and print each color's value to the console.
 
 ```js
-// your code goes here
+for(var i=0;i<array.length;i++) {
+    console.log(array[i]);
+}
 ```
 
 11.Copying from that loop you just wrote, modify it to print every color's value and every color's index in this format: 3, purple or 0, blue etc.
 
 ```js
-// your code goes here
+for(var i=;i<array.length;i++) {
+    console.log(i + ", " + array[i]);
+}
 ```
 
 12.Create a variable named lastColor that will always point to the last element of the colors array, no matter how many colors are in the list. (Hint: make use of the array's length property for this!)
 
 ```js
-// your code goes here
+var lastColor = array[array.length-1];
 ```

3. copy-vs-reference/index.js

@@ -4,38 +4,39 @@ var x = 10;
 var y = "abc";
 var a = x;
 var b = y;
-
+//x=10, y="abc", a=10, b="abc"
 // Value of x, y, a, b
 var x = 10;
 var y = "abc";
 var a = x;
 var b = y;
 a = 5;
 b = "def";
-
+// x=10, y="abc", a=5, b="def"
 // Value of arr & arrCopy
 var arr = [1];
 var arrCopy = arr;
 arr.push(2);
-
+//arr=[1,2], arrCopy=[1] 
 // Value of obj
 var obj = { name: "ryan" };
 obj = { surname: "florance" };
-
+// surname: "florance"
 // What's the output.
 var arr = ["Hi"];
 var arr2 = arr;
 console.log(arr === arr2);
-
+//true
 // What's the output.
 var arr1 = ["Hi!"];
 var arr2 = ["Hi!"];
 console.log(arr1 === arr2);
 console.log(arr == arr2);
-
+//false
+//false
 //What's the output
 console.log([10] === [10]);
-
+// false
 // What's the output?
 
 function personDetails(person) {
@@ -52,29 +53,33 @@ var personObj1 = {
   age: 30
 };
 var personObj2 = personDetails(personObj1);
-console.log(personObj1); // -> ?
-console.log(personObj2); // -> ?
+console.log(personObj1); // -> name:Alex Age: 25
+console.log(personObj2); // -> ?name: John Age: 30
 
 // Guess the output
 var oldArray = [];
 var object = {};
 object.newArray = oldArray;
 oldArray.push(10);
 console.log(object.newArray === oldArray);
+//true
 
 // Guess the output
 var a = 5;
 var b = a;
 a = 10;
 console.log(a);
 console.log(b);
-
+//10
+//5
 // What's the output?
 var a = {};
 var b = a;
 a.a = 1;
 console.log(a);
 console.log(b);
+//1
+//1
 
 // What's the output.
 var a = [];
@@ -83,6 +88,7 @@ a.push(1);
 console.log(a); // [1]
 console.log(b); // [1]
 console.log(a === b);
+//true
 
 // Clone the object person in clone
 var person = {
@@ -95,6 +101,7 @@ var person = {
 };
 
 var clone = {};
+clone = {...person};
 
 // Output of the following
 let brothers = ["John", "Bran", "Robb"];
@@ -117,15 +124,15 @@ let user3 = {
   brothers: ["John", "Bran", "Robb"]
 };
 // Output of the below code and why?
-user.house === user2.house; // output:
-user.house == user2.house; // output:
-user.brothers === user2.brothers; // output:
-user.brothers == user2.brothers; // output:
-user.name == user2.name; // output:
-user.name === user2.name; // output:
-user.brothers == user3.brothers; // output:
-user.brothers === user3.brothers; // output:
-user.house === user2.house; // output
-user.house === user3.house; // output
-user.brothers[0] === user2.brothers[0]; // output
-user.brothers[0] === user3.brothers[0]; // output
+user.house === user2.house; // output: true
+user.house == user2.house; // output: true
+user.brothers === user2.brothers; // output: true
+user.brothers == user2.brothers; // output: true
+user.name == user2.name; // output: true
+user.name === user2.name; // output: true
+user.brothers == user3.brothers; // output: false
+user.brothers === user3.brothers; // output: false
+user.house === user2.house; // output:  true
+user.house === user3.house; // output: true
+user.brothers[0] === user2.brothers[0]; // output: true
+user.brothers[0] === user3.brothers[0]; // output: true