Question

192

How can I extend Array.prototype.push()?

rated 0 times [ 195] [ 3] / answers: 1 / hits: 39061 / 16 Years ago, sat, february 21, 2009, 12:00:00

I'm trying to extend the Array.push method so that using push will trigger a callback method and then perform the normal array function.

I'm not quite sure how to do this, but here's some code I've been playing with unsuccessfully.

arr = [];

arr.push = function(data){



    //callback method goes here



    this = Array.push(data);

    return this.length;

}



arr.push('test');

Answers

Only authorized users can answer the question. Please sign in first, or register a free account.

jadyngraysons

Add To Favorites

Follow

Total Points: 455

Total Questions: 109

Total Answers: 98

Location: Trinidad and Tobago

Member since Fri, May 8, 2020

4 Years ago

jadyngraysons questions

1 AWS Lambda SNS Destinations not working on failure or success

Fri, Aug 14, 20, 00:00, 4 Years ago

1 React Hooks useState Array empty with states rendered in the component

Tue, May 5, 20, 00:00, 4 Years ago

1 postman pm set environment variable

Thu, Apr 23, 20, 00:00, 4 Years ago

1 getElementById after dynamically adding it in React

Sat, Jan 18, 20, 00:00, 4 Years ago

1 How to customise Intl.DateTimeFormat date?

Tue, Dec 31, 19, 00:00, 4 Years ago

View All

answered 16 Years ago tonisandyp · Accepted Answer

Since push allows more than one element to be pushed, I use the arguments variable below to let the real push method have all arguments.

This solution only affects the arr variable:

arr.push = function () {

    //Do what you want here...

    return Array.prototype.push.apply(this, arguments);

}

This solution affects all arrays. I do not recommend that you do that.

Array.prototype.push = (function() {

    var original = Array.prototype.push;

    return function() {

        //Do what you want here.

        return original.apply(this, arguments);

    };

})();