Create Multiple Objects in a Loop with different names

Question

I want to create a "library" with multiple "shelves", but I can't figure out how to name each shelf differently while creating them using a for loop:

function library(initLibraryName, initNumberOfShelves, initNumberOfBooks)
{
    this.name = initLibraryName;
    this.numberOfShelves = initNumberOfShelves;
    this.numberOfBooks = initNumberOfBooks;
    for (var i = 0; i < numberOfShelves; i++)
    {
       this.shelf = new shelf(i, numberOfBooks/numberOfShelves);
    }
}

You're re-assigning this.shelf every iteration. Put them in an array. — elclanrs
– elclanrs, Commented Jan 18, 2014 at 21:35
@Andy - Yes there is - See quirksmode.org/js/associative.html — Ed Heal
– Ed Heal, Commented Jan 18, 2014 at 22:02
That's an object. While it's helpful for programmers from other languages where there are such things to make the comparison, there's still no such thing as an associative array in JS. — Andy
– Andy, Commented Jan 18, 2014 at 22:09

user3052866 · Accepted Answer · 2014-01-18 21:52:08Z

2

I'm not sure why you creating new instances of shelf, but at first you should declare it

// by convention constructor name should start with uppercase letter
function Library(initLibraryName, initNumberOfShelves, initNumberOfBooks) {
    this.name = initLibraryName;
    this.numberOfShelves = initNumberOfShelves;
    this.numberOfBooks = initNumberOfBooks;
    this.shelf = []; // at first you need to define an array
    for (var i = 0; i < numberOfShelves; i++) {
        // then push Shelf instances to an array
        this.shelf.push(new Shelf(i, this.numberOfBooks / this.numberOfShelves)); 
    }
}

function Shelf(arg1, arg2) {
    this.prop1 = arg1;
    this.prop2 = arg2;
    this.method = function () {
        // some logic
    }
}

answered Jan 18, 2014 at 21:52

user3052866

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Community · Accepted Answer · 2017-05-23 12:28:37Z

1

Thanks to: https://stackoverflow.com/users/3052866/user3052866

I realize now that I needed to have an array of shelves in my library class, and that you can't just create multiple objects as part of a function in JS!

Thanks to elclanrs for pointing out the latter!

edited May 23, 2017 at 12:28

CommunityBot

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answered Jan 20, 2014 at 3:50

ionox0

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ionox0 Over a year ago

This was my first post on stackoverflow, great to be a part of the community!

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