/**************************** More JavaScript ***************************** */

// 1. Create a function that takes 3 arguments and returns the sum of the these arguments.

function sum(a,b,c) {

return a + b + c

};

console.log(sum(1,2,3)); // 6

// 2. Create a function named colorCar that receives a color, and prints out, 'a red car' for example.

function colorCar(color) {

return "a " + color +" car"

}

console.log(colorCar('red')); // a red car

// 3. Create an object and a function that takes the object as a parameter and prints out all of its properties and values.

const bestDriver = {

firstName:"Mika",

lastName:"Hakkinen",

teamName:"McLaren",

age:50};

function printObj(obj) {

for (const key in obj) {

console.log(`His ${key} : ${obj[key]}`)

}

}

printObj(bestDriver);

// 4. Create a function named vehicleType that receives a color, and a code, 1 for car, 2 for motorbike.

// And prints 'a blue motorbike' for example when called as vehicleType("blue", 2)

let vehicleCategory = {

1 : "car",

2 : "motorbike",

};

function vehicleType(color, category) {

if (category <= 2) {

console.log('a ' + color + ' ' + vehicleCategory[category]);

} else {

console.log('Please enter valid');

}

}

vehicleType('blue', 2);

vehicleType('green', 3);

// I could have set the function vehicleType also with array like this.

/* let vehicleCategory = ['car', 'motorbike'];

function vehicleType(color, category) {

if (category <= 2) {

category = vehicleCategory[1];

console.log('a ' + color + ' ' + category);

} else {

console.log('Please enter valid number');

}

}

// 5. Can you write the following without the if statement, but with just as a single line with console.log(...);?

/* Yes, we can use ternary operator to achieve it. */

console.log(3 === 3 ? "yes" : "no");

// 6. Create a function called vehicle, like before, but takes another parameter called age,

//so that vehicle("blue", 1, 5) prints 'a blue used car'

function vehicle(color, category, age) {

if (category > 2) {

console.log('Please enter valid number for category of vehicle');

} else {

if (age >= 1) {

age = 'used';

} else {

age = 'new';

}

console.log('a ' + color + ' ' + age + ' ' + vehicleCategory[category]);

}

}

vehicle('blue', 1, 5);

vehicle('black', 4, 5);

vehicle('blue', 1, 5);

// 7. Make a list of vehicles, you can add "motorbike", "caravan", "bike", or more.

let listOfVehicle = ["motorbike", "caravan", "truck", "bike", "jeep"];

// 8. How do you get the third element from that list?

console.log(listOfVehicle[2]);

// 9. Change the function vehicle to use the list of question 7. So that vehicle("green", 3, 1) prints "a green new bike".

function newVehicle(color, category, age) {

if (category > listofVehicle.length) {

console.log('Please enter valid number for category of vehicle');

} else {

if (age > 1) {

age = 'used';

} else {

age = 'new';

}

console.log('a ' + color + ' ' + age + ' ' + listOfVehicle[category]);

}

}

newVehicle('green', 3, 1);

newVehicle('green', 6, 1);

// 10. Use the list of vehicles to write an advertisement. So that it prints something like: "Amazing Joe's Garage, we service cars, motorbikes, caravans and bikes.". (Hint: use a for loop.)

listOfVehicle = ["car", "motorbike", "caravan", "bike"];

let nameOfVehicle = "";

for (i = 1; i < listOfVehicle.length; i++) {

if (i < listOfVehicle.length - 1) {

nameOfVehicle += ', ' + listOfVehicle[i] + 's';

} else if (i < listOfVehicle.length - 2) {

nameOfVehicle += ', ' + listOfVehicle[i] + 's ';

} else {

nameOfVehicle += ' and ' + listOfVehicle[i] + 's.';

}

}

console.log("Amazing Joe's Garage, we service " + listOfVehicle[0] + 's' + nameOfVehicle);

// 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 10?

listOfVehicle.push('jeep');

nameOfVehicle = '';

for (i = 1; i < listOfVehicle.length; i++) {

if (i < listOfVehicle.length - 1) {

nameOfVehicle += ', ' + listOfVehicle[i] + 's';

} else if (i < listOfVehicle.length - 2) {

nameOfVehicle += ', ' + listOfVehicle[i] + 's ';

} else {

nameOfVehicle += ' and ' + listOfVehicle[i] + 's.';

}

}

console.log("Amazing Joe's Garage, we service " + listOfVehicle[0] + 's' + nameOfVehicle);

// 12. Create an empty object.

let emptyObject = {};

// 13. Create an object that contains the teachers that you have had so far for the different modules.

// 14. Add a property to the object you just created that contains the languages that they have taught you.

const teachers = {

teacher1: { name: 'Philipp' },

teacher2: { name: 'Rob' },

teacher3: { name: 'Unmesh & Bonan' },

teacher4: { name: 'Yash' },

};

teachers.teacher1.language = ['HTML'];

teachers.teacher2.language = ['CSS'];

teachers.teacher3.language = ['Git'];

teachers.teacher4.language = ['JavaScript1'];

console.log(teachers);

// 15. Write some code to test two arrays for equality using == and ===. Test the following:

let x = [1, 2, 3];

let y = [1, 2, 3];

let z = y;

/*as we discussed the issue in the previous hw and lecture, they are objects and to ensure equlatiy,

it needs to reference to the same memory locations */

x == y // false --> because of the different references.

x === y // false --> because of the different references.

z == y // true --> they reference to same memory locations.

z == x // false --> there is no correlation.

// 16.

const o1 = { foo: "bar" };

const o2 = { foo: "bar" };

const o3 = o2;

// Show that changing o2 changes o3 (or not) and changing o1 changes o3(or not).

/* Changing o2 changes o3 since o3 is referenced to value of o2.*/

o2.foo = 'bar1';

console.log(o2); // {foo: "bar1"}

console.log(o3); // {foo: "bar1"}

/*But changing o1 doesn`t change o3 since they are not correlated.*/

o1.foo = 'o1bar';

console.log(o1); // {foo:"o1bar"}

console.log(o3); // {foo:"bar1"}

// Does the order that you assign (o3 = o2 or o2 = o3) matter?

/* It does matter since o2 is a constant and cannot be reassigned. */

// 17. What does the following code return? (And why?)

let bar = 42;

// typeof typeof bar;

/* The result will be a string because typeof bar is a "number"

and typeof "number" is string.*/

console.log(typeof bar); // "number"

console.log(typeof "number"); // string