How to change array push to a particular array?

Question

I want to add only integers and ignore others in a particular array. I want to add this condition on that array's push event.

Array.prototype.push = function(){   

if(condition){

   //execute push if true

  }

  else
  {

    //return false

  }

}

Help me how to code this? This affects all the array in my code. I want to check this condition on push only for a particular array. what are the ways to achieve it?

You certainly shouldn't add it to the prototype. Rather, just create some special container class for this array that does the check for you. — Evan Trimboli
– Evan Trimboli, Commented Apr 4, 2013 at 5:52

Community · Accepted Answer · 2017-05-23 12:03:20Z

2

jsFiddle: http://jsfiddle.net/QhJzE/4

Add the method directly to the array:

var nums = [];

nums.push = function(n) {
    if (isInt(n))
        Array.prototype.push.call(this, n);
}

nums.push(2);
nums.push(3.14);
nums.push('dawg');

console.log(nums);

(See How do I check that a number is float or integer? for isInt function.)

Here's some great information: http://perfectionkills.com/how-ecmascript-5-still-does-not-allow-to-subclass-an-array/. What I've shown here is called "direct extension" in that article.

edited May 23, 2017 at 12:03

CommunityBot

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answered Apr 4, 2013 at 6:05

Trevor Dixon

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