Scan array via javascript and remove duplicate objects with Map

Question

Scan array via javascript and remove duplicate objects with Map

Asked 5 years ago

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0

I’m going through the following JSON:

[
    {
        "amount": 6,
        "codes": [
            "BRCH",
            "ARSI",
            "ENSI"
        ]
    },
    {
        "amount": 6,
        "codes": [
            "BRCH",
            "ARSI",
            "ENSI"
        ]
    },
        {
        "amount": 6,
        "codes": [
            "BRCH",
            "ARSI",
            "ENSI"
        ]
    },
    {
        "amount": 2,
        "codes": [
            "BRSI",
            "ARSI"
        ]
    },
        {
        "amount": 2,
        "codes": [
            "BRSI",
            "ARSI"
        ]
    }
]

Well, I am using the javascript Map function to go through it and remove the repeated items and for that I check if the quantity and codes are equal:

let unique = new Map(itemsToClear.map(obj => [obj.amount, obj] && [obj.options.codes, obj]));
const uniques = Array.from(unique.values());

However, by using this form it is not able to scan the code array, there is a way to perform this action?

4

"because it contains a lot of junk and unnecessary data", that’s an excellent sign that you should craft a [mcve] eliminating all that noise.

– Woss

2019/12/10 at 12:36
Thanks for the tip! I updated the question Minimalizando to be clearer.

– Tiago Paza

2019/12/10 at 12:47
if you want to remove duplicates could create a new array only with single items, adding the items within the map, that such?

– Ricardo Pontual

2019/12/10 at 13:02
How could I mount it then? I’m trying to accomplish this even with the Array.from function

– Tiago Paza

2019/12/10 at 13:20

1 answer

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by vik • **2,208** points · Answer 1 · 2019-12-10T15:08:37+00:00

You can compare whether 2 objects "are equal" convert both to a JSON string.

const array = [
    {
        "amount": 6,
        "codes": ["BRCH", "ARSI", "ENSI"]
    },
    {
        "amount": 6,
        "codes": ["BRCH", "ARSI", "ENSI"]
    },
    {
        "amount": 6,
        "codes": ["BRCH", "ARSI", "ENSI"]
    },
    {
        "amount": 2,
        "codes": ["BRSI", "ARSI"]
    },
    {
        "amount": 2,
        "codes": ["BRSI", "ARSI"]
    }
];

const result = array
    .map(e => JSON.stringify(e))
    .reduce((acc, cur) => (acc.includes(cur) || acc.push(cur), acc), [])
    .map(e => JSON.parse(e));

console.log(result);