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I’m looking to possibly achieve a similar effect through Zapier formatter or filter to what lodash does with differenceBy utility function.

For example, having a trigger which comes with an object of following format:

{
    current: {
        labels: :{
            id: '5f212d395422021ebc4b7041',
            slug: 'old-label-1'
        }, {
            id: '5f212d395422021ebc4b7042',
            slug: 'old-label-2'
        },{
            id: '5f212d395422021ebc4b7043',
            slug: 'new-label'
        }]
    },
    previous: {
        labels: :{
            id: '5f212d395422021ebc4b7041',
            slug: 'old-label-1'
        }, {
            id: '5f212d395422021ebc4b7042',
            slug: 'old-label-2'
        }]
    }
}


The effect of running differenceBy on this data would look like:

> _.differenceBy(data.current.labels, data.previous.labels, (i) => i.slug)
/ { id: '5f212d395422021ebc4b7043', slug: 'new-label' } ]


Would be awesome to achieve this through Zapier utilities otherwise I think the best next option would be having a separate trigger that only detects new labels?
Cheers!

You’d have to use a Code step to do this type of comparison: https://zapier.com/apps/code/help

Nice tip @Troy Tessalone , thanks for pointing in a right direction!

I ended up with this solution for a data structure described above:
1. mapped `currentLabels` and `previousLabels` to input data from `#current.labels.slug` and `#previous.labels.slug`
2. Got this code running:

const currentLabels = inputData.currentLabels.split(',');
const previousLabels = inputData.previousLabels.split(',');

const addedLabels = currentLabels.filter(value => !previousLabels.includes(value));
const removedLabels = previousLabels.filter(value => !currentLabels.includes(value));

output = {
    addedLabels,
    removedLabels
};


A strange limitation I’ve found that isn’t well documented in Zapier. It’s around how they process every input as a string - every array is mapped in as comma separated string and object is serialized in a strange way where `JSON.parse()` can’t pick it up (throws parsing errors that are a nightmare to debug). But got it to do what I wanted in the end :grin:  Hopefully this helps to someone looking solve a similar problem in the future.

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