passing an array to an object in js

Question

I'm trying to pass an array to an object:

function process(pid, size, time, IOCArray, IOCtimeA, status) {
    this.pid = pid;
    this.size = size;
    this.time = time;
    this.IOCtimeA = IOCtimeA; // should i use this?
    for (var j = 0; j < IOCArray.length; j++) {
        this.IOCArray[j] = IOCArray[j];
    } // or something like this?
    this.status = status;
}

proarray[ID] = new process(ID, size, time, IOCArray, IOCtimeA, status);

Now how can I access for example proarray[5].IOCArray[4]? Actually I'm not sure how to use "this" for arrays.

Have you tried using proarray[5].IOCArray[4] as you say? Are you getting any errors? — abl
– abl, Commented Dec 6, 2014 at 16:53

justinpinili · Accepted Answer · 2014-12-06 17:02:40Z

1

Looking at your provided code, both of your suggested solutions are not ideal because if you set an object's property to another array, you are just setting a reference to the original array. If you were to modify your object's array property, then you are also going to modify the original array.

Instead, what you are going to have to use is the slice() method. This will create a new, independent copy of the array for your object.

example:

this.IOCArray = IOCArray.slice();

It is also worth noting that .slice() will only make a shallow copy of an array. Nested arrays will be setting a reference to original nested array, so if you know you will have nested array's in any of your variables, you'll need to slice() those nested arrays as well.

Array.prototype.slice() | MDN Documentation

edited Dec 6, 2014 at 17:02

answered Dec 6, 2014 at 16:57

justinpinili

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Liglo App · Accepted Answer · 2014-12-06 16:54:13Z

0

With this.IOCtimeA=IOCtimeA;you assign the reference to the array. If you change IOCtimeA, proarray[ID].IOCtimeA will also change.

With the for loop, or using a trick from @adaneo, you will copy the values and create an independent array in there.

answered Dec 6, 2014 at 16:54

Liglo App

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1 Comment

Paul Over a year ago

As shown, the for loop lacks initialization of the array. It needs this.IOCArray = []

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