override array length in javascript

Question

I got an idea to override javascript array length value and wants to return any random value.
let's say..

 a=[56,78,89,200,800]
 b=['a','b','f']

 a.length = 2  ;  //should give me only 2;
 b.length = 2  ; //also should give 2

Is it possible to change length property and is there any tweaks to change the splice or slice method also.

i tried but in vain @Rayon,yes i want that value to be 2 or anything but it should be same value for any array. — bharath muppa
– bharath muppa, Commented Jun 22, 2016 at 7:36
"I got an idea to override javascript array length value" - wrong idea. What are you actually trying to do? — Bergi
– Bergi, Commented Jun 22, 2016 at 8:55

José M. Carnero · Accepted Answer · 2016-06-22 08:24:30Z

2

Array.length is a protected property, only read; is a bad idea try to change it.

Better you can create your own class; example:

var oArray = function (aArr){
    oRet = {};

    for(var i = 0, aArrL = aArr.length; i < aArrL; i++){
        oRet[i] = aArr[i];
    }
    oRet.length = 2;

    return oRet;
};

a= new oArray([56,78,89,200,800]);
b=['a','b','f'];

console.log(a.length);
console.log(b.length);

a is a custom class, b is standard JavaScript Array.

answered Jun 22, 2016 at 8:24

José M. Carnero

2631 silver badge8 bronze badges

Sign up to request clarification or add additional context in comments.

2 Comments

Redu Over a year ago

"Array.length is a protected property, only read; is a bad idea try to change it." No it is not protected, it can be modified and depending on the case it is a pretty good idea to change it such as emptying an array without breaking its references by making it's length = 0;

José M. Carnero Over a year ago

You can change the value, like b.length = 2; (and delete the last value), but not to change is behaviour, like Array.prototype.length = 2;. Maybe I expressed inexactly.

Collectives™ on Stack Overflow

override array length in javascript

1 Answer 1

2 Comments

Your Answer

Linked

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

2 Comments

Your Answer

Sign up or log in

Post as a guest

Linked

Related