I have an array that contains objects. The array looks like this:

[
    {
        "number": "10a",
        "person": "Velvet"
    },
    {
        "number": "10b",
        "person": "Edna"
    },
    {
        "number": "11a",
        "person": "Shionne"
    },
    {
        "number": "11b",
        "person": "Aifread"
    },

]

I want to combine objects that have identical number property. For example, the first two objects have property number: "10a", and number: "10b". I want these to be combined such that the output becomes:

{
    "10": {
       "person": ["Velvet", "Edna"]
    },
    "11": {
       "person": ["Shionne", "Aifread"]
    }
}

I am not sure how to do it as it seems too complicated for me. I also looked over stackoverflow but can't seem to find a similar problem, hence, my post. Thanks for the help!

CodePudding user response：

I'll assume that the normalization for number is just to remove non numeric characters. If so, you can just iterate over the original array and process each element:

var original = [
    {
        "number": "10a",
        "person": "Velvet"
    },
    {
        "number": "10b",
        "person": "Edna"
    },
    {
        "number": "11a",
        "person": "Shionne"
    },
    {
        "number": "11b",
        "person": "Aifread"
    },
];

const merged = {}
    
        original.forEach(item => {
            var normalizedKey = item.number.replaceAll( /\D/g, "" )
            if(!merged[normalizedKey]) merged[normalizedKey] = { person: []}
            merged[normalizedKey].person.push(item.person)
        })
        
        console.log({merged})
    

CodePudding user response：

Parse number. Add object if missing and append name:

const result = {};
arr.forEach(o => {
    const nr = o.number.slice(0,2);
    result[nr] = result[nr] || {person:[]};
    result[nr].person.push(o.person);
});

console.log(result);