Remove repeated occurance from an array

Question

I have a requirement to remove repeated objects from an array based on certain condition check If any of the object with same "connector", "address", "type" values in this array i need remove that object.

array =  [{
        connector : 'smtp',
        name : 'john',
        address : 'john@gmail.com',
        type : 'cc'
    }, {
        connector : 'smtp',
        name : 'john',
        address : 'john@gmail.com',
        type : 'cc'
    }, {
        connector : 'gtp',
        name : 'mark',
        address : 'mark@gmail.com',
        type : 'cc'
    }, {
        connector : 'ftp',
        name : 'wiki',
        address : 'wiki@gmail.com',
        type : 'bcc'
    },
    {
        connector : 'smtp',
        name : 'wiki',
        address : 'wiki@gmail.com',
        type : 'cc'
    }
 ]

I need the output like the following way

output = [{
        connector : 'smtp',
        name : 'john',
        address : 'john@gmail.com',
        type : 'cc'
    },{
        connector : 'gtp',
        name : 'mark',
        address : 'mark@gmail.com',
        type : 'cc'
    }, {
        connector : 'ftp',
        name : 'wiki',
        address : 'wiki@gmail.com',
        type : 'bcc'
    },
    {
        connector : 'smtp',
        name : 'wiki',
        address : 'wiki@gmail.com',
        type : 'cc'
    }
 ]

Sorry i tried some repeated foreach looping but ended up no where. Could you help me to find any efficient way of doing the same.

try looking into underscore.js library. they have duplicate filter function. — binariedMe, Apr 01 '16 at 05:48

score 1 · Accepted Answer · answered Apr 01 '16 at 05:51

1

It can be done with the help of underscore uniq.

array =  [{
        connector : 'smtp',
        name : 'john',
        address : 'john@gmail.com',
        type : 'cc'
    }, {
        connector : 'smtp',
        name : 'john',
        address : 'john@gmail.com',
        type : 'cc'
    }, {
        connector : 'gtp',
        name : 'mark',
        address : 'mark@gmail.com',
        type : 'cc'
    }, {
        connector : 'ftp',
        name : 'wiki',
        address : 'wiki@gmail.com',
        type : 'bcc'
    },
    {
        connector : 'smtp',
        name : 'wiki',
        address : 'wiki@gmail.com',
        type : 'cc'
    }
 ]
 //generating a string of keys you wish to compare which forms the criteria for uniqueness
 add = _.uniq(array, function(a){ return a.connector + "-" + a.address + "-" + a.type;})

 console.log(add)

working code here

answered Apr 01 '16 at 05:51

Cyril Cherian

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`uniqBy` can also be used. `_.uniqBy(array, obj => obj.connector + '-' + obj.address + '-' + obj.type);` – Tushar Apr 01 '16 at 05:52
`JSON.stringify` is improve solution, i hope – Dima Fitiskin Apr 01 '16 at 05:54
@Tushar are you sure about the uniqBy its not there in the doc http://underscorejs.org/ – Cyril Cherian Apr 01 '16 at 05:54
1

@Cyril It is in Lodash – Tushar Apr 01 '16 at 05:56
Use Lodash's [`uniqWith`](https://lodash.com/docs#uniqWith) explained in [this SO answer](https://stackoverflow.com/a/52525557/6172657) to avoid comparing Strings. – Reed Dunkle Sep 28 '18 at 12:26
Ok lodash is also one way of doing it..set can be another way of doing the same...what I answered is another way of doing it. – Cyril Cherian Sep 29 '18 at 07:30

Remove repeated occurance from an array

1 Answers1