Change object property depending on integer value in javascript

Question

I have an object, Player, which has different properties for different rounds for example round_1, round_2, .. , round_7. I would like to give them values depending on the integer, round value.

What i thought would work would be with a function:

//voor = round in Estonian
function valiVoor(player, r){
if (r == 1){
    return player.voor_1;
}
else if (r == 2){
    return player.voor_2;
}
else if (r == 3){
    return player.voor_3;
}
else if (r == 4){
    return player.voor_4;
}
else if (r == 5){
    return player.voor_5;
}
else if (r == 6){
    return player.voor_6;
}
else if (r == 7){
    return player.voor_7;
}
}

Although calling out function:

valiVoor(player_one,1) = "asd";

Will not change the property player_one.voor_1 = "asd". Should i work with arrays or is there any other option to resolve the issue?

Sorry, had connectivity problems and some text got lost, edited — shawwy, May 07 '15 at 09:55

Kyll · Answer 1 · 2015-05-07T10:10:27.093

4

You could use the Bracket notation:

player['voor_' + r] = 'asd'; //Equivalent to player.voor_# where # is the number r

If you want to check if the property exists before assigning (otherwise if r goes crazy it takes your player object in its madness):

if(player.hasOwnProperty('voor_' + r)) {
  //Do stuff
}

See this MDN link for Object.prototype.hasOwnProperty.

edited May 07 '15 at 10:10

answered May 07 '15 at 09:58

Kyll

7,036
7
41
64

score 1 · Accepted Answer · answered May 07 '15 at 09:58

1

function valiVoor(player, r){
    return player['voor_'+r];
}

And a setter:

function setValiVoor(player, r, value){
    player['voor_'+r] = value;
}

answered May 07 '15 at 09:58

Chris Charles

4,406
17
31

Thanks, this setter helped alot – shawwy May 07 '15 at 10:10

score 0 · Answer 3 · answered May 07 '15 at 09:57

You can also access Object properties with the squared brackets just like Arrays.

function getValiVoor(player, r){
    return player['voor_' + r];
}

If you want to assign a value, you could pass the value to the function:

function setValiVoor(player, r, val){
    player['voor_' + r] = val;
}

Change object property depending on integer value in javascript

3 Answers3