Angular generates an array that is not native to the system

When I directly set vm.files in my view using the following code:

<input type="file" ng-model= vm.files[0]>
<input type="file" ng-model= vm.files[1]>

The contents of vm.files are displayed as shown in example A:

https://i.stack.imgur.com/K3V6p.png

However, I require it to be like example B:

https://i.stack.imgur.com/RDLcI.png

To achieve the desired structure in example B, I have to execute vm.files = new Array() in my controller.

I am curious about the distinction between the arrays shown in example A and example B?

Is there a difference or multiple types of arrays in JavaScript?

javascriptangularjsarraysng-file-upload

Answer №1

In JavaScript, there are not actually "2 types of arrays". Instead, what is happening here is the creation of an Object named files with Properties 0 and 1. This technique is known as Object Bracket Notation, which is commonly seen in Angular because Angular assumes that every property is an object unless specified otherwise in advance. It is true that you should use vm.files = new Array() to properly set up pre-allocation for the array files.

Answer №2

Is there a distinction between the two types of arrays in javascript? Not really.

In the initial instance, we have a javascript object containing two properties: 0 and 1.

The second illustration showcases a javascript array with two elements: the first one and the second one.

There are various differences between them; for instance, the array type includes traditional methods such as splice, push, and pop. To explore more on these variances, I recommend checking out this tutorial (and perhaps diving into some basic javascript concepts on your own too).

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