CODEWITHSUNDEEP
javascriptarraysoopobjectmethods
Anthony
Anthony

Reputation: 37085

How to create a method for an array class?

Sorry, I know this is programming 101, but I can't find any good documentation...

I have an array, and I want to cast each member as an object and then call them by the name assigned (this would be so much simpler if javascript allowed for non-number index values). For instance:

 var things = ['chair', 'tv', 'bed'];
 var costs = ['10', '100', '75'];

 for (var i = 0; i < things.length; i++) {
      thing.name = things[i];
      thing.cost = costs[i];
 }

 alert(thing.name('tv').cost);

Obviously this isn't the way to do this, but the desired outcome would be an alert that said "100".

I have gotten as far as creating a class that has a method called name which points back to the main object, like so:

function thing(name, cost) {
         function name(thename) {
              return this;
         }
this.thingname = name;
this.name = name;
this.cost = cost;
}

But this still requires that each object has a unique variable name, which goes against the whole point. What I want is to simply throw all of my array into some generic class and call the values I need by the name.

I know this is probably way to easy to ask here, but I'm stuck!

Thanks.

Upvotes: 0

Views: 212

Answers (6)

Pim Jager
Pim Jager

Reputation: 32129

If you need to do this using your original data format (because you have no influence on it) use the following:

var things = ['chair', 'tv', 'bed'];
var costs = ['10', '100', '75'];

var associatedThings;

for(i=0,x=things.length;i<x;i++){
    associatedThings[things[i]] = {cost: costs[i]};
}

alert(associatedThings['tv'].cost);

Upvotes: 0

TheVillageIdiot
TheVillageIdiot

Reputation: 40512

why don't you try JSON:

like 

var myArray= {"things": [
                    {"name":"chair","price":"10"},
                    {"name":"tv","price":"100"},
                    {"name":"bed","price":"75"}
             ]};

//now you can use it like this
for(var i=0; i< myArray.things.length; i++)
{
    alert(myArray.things[i].name + " costs " + myArray.things[i].price);
}

Upvotes: 0

Dasha Salo
Dasha Salo

Reputation: 5169

use Why don't define your arrays as an object like 

var things = {'chair':10, 'tv':100, 'bed':75}

Then you can access prices like properties of an associative array

things.chair

would give you 10

Upvotes: 1

ojrac
ojrac

Reputation: 13421

How about just using a dictionary object:

var things = {'chair':10, 'tv':100, 'bed':75};
alert(things['chair'])

// if you want to use things['chair'].cost, it'd look more like this:
var things = {'chair': {cost: 10}, 'tv': {cost: 100}, 'bed': {cost: 75}};

Upvotes: 1

Jeremy Huiskamp
Jeremy Huiskamp

Reputation: 5304

var stuff = {
    chair: 10,
    tv: 100,
    bed: 75
};
alert(stuff.chair); // alerts '10'
alert(stuff['chair']); // alerts '10'

stuff.house = 100000;
stuff['car'] = 10000;
alert(stuff['house']); // you get the picture...
alert(stuff.car);

Upvotes: 2

Paolo Bergantino
Paolo Bergantino

Reputation: 488734

Why not use objects?

var things = {
  chair: 10,
  tv: 100,
  bed: 75
};
alert(things.chair); // 10
alert(things['tv']); // 100

Upvotes: 5

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