Finding a value in an array of objects using underscore?

Question

JavaScript

Hello. Something I can not understand how to look for values ​​inside an array with objects, if the object also contains an array.
The structure is like this:

[{
        id: 0,
        regions: [
            "region1",
            "region2"
        ]
    },
    {
        id: 1,
        regions: [
            "region3",
            "region2"
        ],
        {
            id: 2,
            regions: [
                "region1"
            ]
        }
    }
]

I need to get matches with my key (for example, "region1"), but I don't understand. I tried to use each, and find \ where inside it, but it doesn't work.

Answer 1

arr.filter((elem) => elem.regions.includes('region1'))

Rewrite on underscore or can you handle it yourself?)