JS Array Help

I want to be able to keep a record of the last 3 tweets my system used....

eg: 949271439605190656,950237352001187841,952851700234137601

So each my my js function runs it recieves a new ID... I want array to drop the last one and add the new one so there is only ever 3.

I have this code:

var last3Ids = [0,0,0];

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if (Object.keys(last3Ids).length >= 3) {
	last3Ids = last3Ids.slice(last3Ids.length - 3, 3);

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But the array goes between having 3 then 4 then 3 then 4 id's

Can someone help why this is happening?
Steve TinsleyAsked:
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Julian HansenCommented:
Is this a PHP question or a JavaScript question? Please confirm so we can amend the TA's to be accurate.

What you want to do is push new values and shift old values

var lastids = [0,0,0];
addID(lastids, 1);
addID(lastids, 2);
addID(lastids, 3);
addID(lastids, 4);
addID(lastids, 5);
addID(lastids, 6);
addID(lastids, 7);

/* Function adds the newest id and removes the last which it returns */
function addID(data, newid) 
  return data.shift();

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Steve TinsleyAuthor Commented:
Sorry, it is Javascript.
This is great, thankyou!
Julian HansenCommented:
You are welcome.
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