Programinhas que escrevo enquanto estudo JavaScript.

arrays-of-objects.js

/*
Exercice:
Define a function called olderAge. We want the function to return the age of the person who is older.
*/

// Our person constructor
function Person (name, age) {
    this.name = name;
    this.age = age;
}

// We can make a function which takes persons as arguments
// This one computes the difference in ages between two people
var ageDifference = function(person1, person2) {
    return person1.age - person2.age;
};

// Make a new function, olderAge, to return the age of
// the older of two people
var olderAge = function(person1, person2){
	var ages = [person1.age, person2.age];
	var maxAge = 0;
	
	for(var i = 0; i<ages.length;i++){
		if(ages[i] > maxAge){
			maxAge += ages[i];
		}
	}
	return maxAge;
};

// Let's bring back alice and billy to test our new function
var alice = new Person("Alice", 30);
var billy = new Person("Billy", 25);

console.log("The older person is "+olderAge(alice, billy));

cash-register.js

/*
Exercício: Crie uma caixa registradora.
*/

/* Caixa registradora */
var cashRegister = {
    
    // valor total da compra
    total:0,
    
    // valor da última transação feita
    lastTransactionAmount: 0,
    
    // adiciona itens a compra
    add: function(itemCost){
        this.total += itemCost;
        this.lastTransactionAmount = itemCost;
    },
    
    // calcula o valor bruto de cada produto, de acordo com a quantidade
    scan: function(item,quantity){
        switch (item){
            case "eggs": 
                this.add(0.98 * quantity); 
                break;
            case "milk": 
                this.add(1.23 * quantity); 
                break;
            case "magazine": 
                this.add(4.99 * quantity); 
                break;
            case "chocolate": 
                this.add(0.45 * quantity); 
                break;
        }
        return true;
    },
    
    // cancela a última transação
    voidLastTransaction : function(){
        this.total -= this.lastTransactionAmount;
        this.lastTransactionAmount = 0;
    },
    
    // fornece desconto para os funcionários
    applyStaffDiscount: function(employee){
    	this.total -= (this.total * employee.discountPercent / 100);
    }
    
};

/* Constructor para adicionar funcionários que tem desconto nos produtos */
function StaffMember(name,discountPercent){
    this.name = name;
    this.discountPercent = discountPercent;
}

dragon-slying-game.js

/*
Exercice: Create a dragon slaying minigame using while loops and if/else statements
*/

var slaying = true;
var youHit = Math.random(); // random number from 0 to 1;
var damageThisRound = Math.floor(Math.random() * 6 + 1); // random number from 1 to 6
var totalDamage = 0;

while(slaying){
	if(youHit === 1){
		console.log("Yeah baby. You rocket it!");
		totalDamage += damaThisRound;
		if(totalDamage >= 4){
			console.log("You killed the dragon!");
			slaying = false;
		} else{
			youHit = Math.random();
			slaying = false;
		}
	}else{
		console.log("Oh man. The dragon defeated you.");
	}
	slaying = false;
}

nested-condition.js

/*
Exercice: Print out the numbers from 1 - 20.
The rules:
	1. For numbers divisible by 3, print out "Fizz".
	2. For numbers divisible by 5, print out "Buzz".
	3. For numbers divisible by both 3 and 5, print out "FizzBuzz" in the console.
	4. Otherwise, just print out the number.
	PS: Try answering this exercise using a nested conditional.
*/

for(var x = 1; x<21; x++){
	if(x % 5 === 0){
		if(x % 3 === 0){
			console.log('FizzBuzz');
		}else{
			console.log('Buzz');	
		}
	} else if(x % 3 === 0){
		console.log('Fizz');
	}else{
		console.log(x);
	}
}

switch.js

/*
Exercice: Imagine you have a movie collection and you want to write some code that assigns your review to each of them.
    Instructions: Below are the movies and your review. Use a switch structure to write code for the information below:
        
        1. "Matrix" - "good trip out"
        2. "Princess Bride" - "awesome date night movie"
        3. "Welcome to America" - "Amjad's favorite"
        4. "Remember the Titans" - "love the sports"
        5. "Why do I look like I'm 12?" - "The Ryan and Zach story"
        6. "Fighting Kangaroos in the wild" - "Token Australian movie for Leng"
        PS: 'getReview' should be a function that takes a movie name and returns its review based on the information above.
            If given a movie name not found just return "I don't know!".
*/

var getReview = function(movie){
	switch(movie){
		case 'Matrix':
			return "good trip out";
		case 'Princess Bride':
			return "awesome date night movie";
		case 'Welcome to America':
			return "Amjad's favorite";
		case 'Remember the Titans':
			return "love the sports";
		case 'Why do I look like I\'m 12?':
			return "The Ryan and Zach story";
		case 'Fighting Kangaroos in the wild':
			return "Token Australian movie for Leng";
		default:
			return "I don\'t know!";
	}
};