Javascript adding key to factory funciton object

Question

my apologies if this question has been answered in previous post. I looked but found nothing like it. I am wondering if anyone knows of a way that I can add a key to a resulting object from a factory function. Meaning, outside of the factory function I want to later add a key versus going back to the factory function itself and changing what the out put should be.

/*below you will see where I have tried to add the key from the outside using the function name as the object name similiar to how one would with a standard object but the code below will return undefinded, my guess is because the object has no name, but rather is simply returned.*/

function createCharacter(name, nick, race, origin, attack, defense){
	return {
		name: name,
		nickname: nick,
		race: race,
		origin: origin,
		attack: attack,
		defense: defense,
		describe: function(){
			console.log(`${this.name} is a ${this.race} from ${this.origin}`);
		}
}

createCharacter.weapon = weapon;

A.J. Uppal · Accepted Answer · 2017-05-11 04:04:59Z

1

You need to create an instance of the function using new createCharacter():

/*below you will see where I have tried to add the key from the outside using the function name as the object name similiar to how one would with a standard object but the code below will return undefinded, my guess is because the object has no name, but rather is simply returned.*/

function createCharacter(name, nick, race, origin, attack, defense){
	return {
		name: name,
		nickname: nick,
		race: race,
		origin: origin,
		attack: attack,
		defense: defense,
		describe: function(){
			console.log("${this.name} is a ${this.race} from ${this.origin}"+weapon);
		}
    }
}

x = new createCharacter()
x.weapon = "sword";
console.log(x.weapon);

answered May 11, 2017 at 4:04

A.J. Uppal

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Comments

Nic · Accepted Answer · 2017-05-11 04:26:08Z

If you continue use createCharacter function,get a Character instance like this:

function createCharacter(name, nick, race, origin, attack, defense){
    return {
        name: name,
        nickname: nick,
        race: race,
        origin: origin,
        attack: attack,
        defense: defense,
        describe: function(){
            console.log(`${this.name} is a ${this.race} from ${this.origin}`);
        }
   }
}
//just directly invoke factory function,which will return a Character instance
var oneCharacter = createCharacter();
oneCharacter.weapon = "weapon";

another way is use constuctor,like this:

function Character(name, nick, race, origin, attack, defense){
    this.name = name;
    this.nick = nick;
    this.race = race;
    this.origin = origin;
    this.attack = attack;
    this.defense = defense;
    this.describe = function(){
            console.log(`${this.name} is a ${this.race} from ${this.origin}`);
        }
}
//use keyword "new" get a Character instance 
var oneCharacter = new Character();
oneCharacter.weapon = "weapon";

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