replace function in javascript array

Question

We know javascript array.push appends elements to the array. Is there an option to replace the elements in the array? The below function gets called twice and I have no control over event.mediaCollection.mediaIds. So mediaDTOs array gets populated with same number of mediaIds twice. I wish to prevent that from happening.I'm looking to add new mediaIds everytime this function is called instead of pushing mediaIds to the same array.

function calledTwice(){
    var mediaIds = event.mediaCollection.mediaIds; 
    var mediaDTOs = [];
    for(var i = 0; i < mediaIds.length; i++) {
            mediaDTOs.push({id:mediaIds[i]});
    }
}

Edit: Can't afford to create a temporary object to achieve this. Got to get the ids in the mediaDTOs array to be unique.

Sorry for not being really clear, but xpapad has almost got what I was looking for. mediaDTOs needs to be an array, I'm not really understanding what difference an object would make? — neelmeg
– neelmeg, Commented Jan 20, 2012 at 1:28

epascarello · Accepted Answer · 2012-01-20 00:47:08Z

2

change

mediaDTOs.push({id:mediaIds[i]});

to

mediaDTOs[i] = {id:mediaIds[i]};

but since mediaDTOs is local, I am not sure what the problem is...

answered Jan 20, 2012 at 0:47

epascarello

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Comments

xpapad · Accepted Answer · 2012-01-20 00:53:09Z

0

Use an object instead:

var mediaDTOs = { };
for(var i = 0; i < mediaIds.length; i++) {
   mediaDTOs[ mediaIds[i] ] = true;
}

Then you can get the unique ids with something like:

var ids = [];
for(var id in obj){
    ids.push(id);
}

Make sure you really want to make mediaDTOs local though...

answered Jan 20, 2012 at 0:53

xpapad

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1 Comment

neelmeg Over a year ago

Seems like an interesting answer. I did not understand the "obj" part though. Should I use mediaDTO instead of the obj in the second for loop?

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