What is the method to modify filterFilter so that it outputs an array of index values rather than the actual

Is there a way to utilize filterFilter functionality without creating a new array every time it runs? Instead of returning a new array, I'm looking to return an array of indexes and then retrieve the associated items in my service. This approach allows me to set up a $watch export on my service, enabling me to monitor changes on the original items rather than the filtered ones.

I've thought about replicating the angular filterFilter source code, but that doesn't seem sustainable in the long term. What other options do I have?

Context:

I'm developing a form wizard service that applies a schema to various steps, each with slightly different object structures, all contained within an array of objects. When using filterFilter, it generates a new array of objects. However, when I make modifications to the object within the service using a "setter," it creates a new object rather than updating the existing one, which is not what I need.

Answer №1

To easily get the keys of an array in Javascript, you can use Object.keys(arrayName), but keep in mind that you will need a poly-fill for compatibility with IE8 or lower versions.

var a = ['foo', 'bar'];
Object.keys( a ); //returns ['0','1'];

If you want to learn more about Object.keys and its implementation for older browsers, check out the informative MDN Object.keys article.

Regarding your issue, it seems like there may have been a misunderstanding with the filter filter in AngularJS. When using this filter, the filtered array may appear different, but each object still remains as a reference to the original. Therefore, any modifications made to objects from the filter should reflect on the original array without any problems.

I hope this explanation clarifies things for you.

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