Question 270529 in Javascript Question posted in
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Javascript – How to find and remove all duplicates objects from an array of objects

I am getting below response, i wanted to remove all the duplicates object based on lineId and status.
I am trying to find all the duplicates with new status in below response.

In the below example, i wanted to remove those objects whose lineId is same but status is New.

i tried below code but unable to filter the expected result.

I appreciate any help on this.

const response = [
    {       
        "line": "Line 2",
        "lineId": "R_X002_WC02",        
        "status": "New"
    },
    {        
        "line": "Line 3",
        "lineId": "R_X002_WC03",
        "status": "New"
    },
    {       
        "line": "Line 2",
        "lineId": "R_X002_WC02",        
        "status": "Submitted"
    },
    {        
        "line": "Line 4",
        "lineId": "R_X002_WC04",
        "status": "New"
    },
    {        
        "line": "Line 4",
        "lineId": "R_X002_WC04",
        "status": "Submitted"
    }
];

Below is my expected Output

const ExpectedOutput = [    
    {        
        "line": "Line 3",
        "lineId": "R_X002_WC03",
        "status": "New"
    },
    {       
        "line": "Line 2",
        "lineId": "R_X002_WC02",        
        "status": "Submitted"
    },
    {        
        "line": "Line 4",
        "lineId": "R_X002_WC04",
        "status": "Submitted"
    }
];

i tried below code

var finalarr = [];
response.forEach((item) => {
        response.filter(i => i.lineId === item.lineId).length > 1
        finalarr.push(item);
      });
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2

Answers


  1. 0 
    const unique = new Set();
const finalarr = response.filter(item => {
    if (unique.has(item.lineId)) {
        return false; 
    } else {
        unique.add(item.lineId);
        return true;
    }
});

    try this it works according to what you want

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  2. 0

    One good way will be to convert this array to a new object where you keys are the key of the object and value can be the object itself. This will get rid of any duplicates

    var finalarr = {};
response.forEach((item) => {
        if(!finalarr[i.lineId] {
            finalarr[i.lineId] = i;
        }
    
      });
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