done

answer.js

@@ -0,0 +1,50 @@
+//1
+function sum(x,y,z){
+	return (x+y+z);
+};
+
+
+//2
+function colorCar (color){
+	return `${color} car`;
+};
+
+//3
+function printObj(obj){
+	for( prop in obj){
+		console.log(prop +" is "+obj[prop]);
+	}
+}
+
+//4
+function vehicleType(color,code){
+	if(code == 1)
+		return `a ${color} car`;
+	if(code == 2)
+		return `a ${color} motorbike `;
+};
+
+//5 c
+console.log((3 === 3) ? "yes" : "no");
+
+//6
+function vehicle(color,code,age){
+	if(code == 1)
+		return `a ${color} used  car`;
+	if(code == 2)
+		return `a ${color} used motorbike `;
+};
+
+//7
+let vehicles = ["motorbike","caravan","bike","suv"];
+
+//8
+vehicles[2];
+//
+function vehicleType2(color,code,age){
+	if(age > 1)
+		return `a ${color} used ${vehicles[code]}`;
+
+		return `a ${color} new ${vehicles[code]}`;
+};
+

ex.js

@@ -1,13 +1,21 @@
 // TODO: define addFavoriteBook(..) function
-
-// TODO: define printFavoriteBooks() function
+function addFavoriteBook(bookName){
+	if(!bookName.includes("Great"))
+		favoriteBooks.push(bookName);
+}
 
 const favoriteBooks = [];
-
 addFavoriteBook("A Song of Ice and Fire");
 addFavoriteBook("The Great Gatsby");
 addFavoriteBook("Crime & Punishment");
 addFavoriteBook("Great Expectations");
 addFavoriteBook("You Don't Know JS");
-
 // TODO: print out favorite books
+
+function printFavoriteBooks(){
+	for(let i = 0; i<favoriteBooks.length; i++){
+	console.log(`Your  ${favoriteBooks.length } favorite books are : ${i+1}. ${favoriteBooks[i]}`)
+	}
+}
+
+printFavoriteBooks();