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FatDogMark
FatDogMark

Reputation: 1205

How to make array at javascript class?

Recently I am learning to make javascript class, I saw other people make class like this

var item = {
     'a':{'b':1000,'c':2000,'d':3000} , //how to make a variable become an array?
     myfunction : function(){
         console.log(item.a.b); //and output item.a[1]?
     }
 };
 item.myfunction();

But is it possible to make variable a an array? and output a variable item.a[1] like that?I tried

var a=new Array('1000','2000','3000') but error, I need a correct syntax.

Upvotes: 1

Views: 2749

Answers (3)

melpomene
melpomene

Reputation: 85767

var item = {
    'a': [1000, 2000, 3000],
    myfunction: function () {
        console.log(this.a[1]);
    }
};

But that's not a class, and there is no "variable a".

Upvotes: 2

Kodemon
Kodemon

Reputation: 370

You have 2 ways depending on if you want to convert "a" to an array or if you just want "a" to be an array.

The first method would be to run it through a function

function toArray(object) {
    var array = new array();
    for (key in object) {
        if (object.hasOwnProperty(key)) {
            array.push(object);  // This is alternative for indexed array
            array[key] = object; // This is for an associative array
        }
    }
    return array;
}

Maybe have your "class" call this function and assign the return value to "a"

var item = {
    'a':{'b':1000,'c':2000,'d':3000} , //how to make a variable become an array?
    myfunction : function(){
        this.a = toArray(this.a);
        console.log(this.a[1]) // If you do indexed
        console.log(this.a.b); // If you do associative
    }
};

item.myfunction();

The second way was explained by @ahren which is just to define "a" as an array by [...] the values instead of {...}

You can also check out my own question put up about OOP in JavaScript, got a nice reply from T.J. about it there concerning private methods.

JavaScript OOP Pitfalls

Don't know if this is what you wanted but should work.

Upvotes: 0

ahren
ahren

Reputation: 16961

'a':[1000,2000,3000]

console.log(item.a[0]); // 1000
console.log(item.a[2]); // 3000

Read more: http://www.elated.com/articles/javascript-array-basics/

Upvotes: 1

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