grouping objects using lodash

I have an array userList:

[

  {email : 'abc@gmail.com',

  department : 'd1'},

  {email : 'abc@gmail.com',

  department : 'd2'},

  {email : 'dec@gmail.com',

  department : 'd1'},

]

I wanted it to be like :

[

  {

  email : 'abc@gmail.com',

  department : ['d1','d2']

  },

  {

  email : 'dec@gmail.com',

  department : ['d1']

  }

]

I achieved it using :

const userGrp = _.groupBy(userList, 'email');

let data = ;

for (let key in userGrp) {

    if (userGrp.hasOwnProperty(key)) {

        const obj = {

            email: key,

            dept: extractDept(userGrp[key]),

        };

        data.push(obj);

    }

}



function extractDept(userObjList) {

  const arr = ;

  userObjList.forEach((element) => {

    arr.push(element.departmentName);

  });

  return arr;

}

How can I acheive it using lodash ?

asked Nov 19 '18 at 12:11

Samuel

1221219

add a comment |

I have an array userList:

[

  {email : 'abc@gmail.com',

  department : 'd1'},

  {email : 'abc@gmail.com',

  department : 'd2'},

  {email : 'dec@gmail.com',

  department : 'd1'},

]

I wanted it to be like :

[

  {

  email : 'abc@gmail.com',

  department : ['d1','d2']

  },

  {

  email : 'dec@gmail.com',

  department : ['d1']

  }

]

I achieved it using :

const userGrp = _.groupBy(userList, 'email');

let data = ;

for (let key in userGrp) {

    if (userGrp.hasOwnProperty(key)) {

        const obj = {

            email: key,

            dept: extractDept(userGrp[key]),

        };

        data.push(obj);

    }

}



function extractDept(userObjList) {

  const arr = ;

  userObjList.forEach((element) => {

    arr.push(element.departmentName);

  });

  return arr;

}

How can I acheive it using lodash ?

asked Nov 19 '18 at 12:11

Samuel

1221219

add a comment |

I have an array userList:

[

  {email : 'abc@gmail.com',

  department : 'd1'},

  {email : 'abc@gmail.com',

  department : 'd2'},

  {email : 'dec@gmail.com',

  department : 'd1'},

]

I wanted it to be like :

[

  {

  email : 'abc@gmail.com',

  department : ['d1','d2']

  },

  {

  email : 'dec@gmail.com',

  department : ['d1']

  }

]

I achieved it using :

const userGrp = _.groupBy(userList, 'email');

let data = ;

for (let key in userGrp) {

    if (userGrp.hasOwnProperty(key)) {

        const obj = {

            email: key,

            dept: extractDept(userGrp[key]),

        };

        data.push(obj);

    }

}



function extractDept(userObjList) {

  const arr = ;

  userObjList.forEach((element) => {

    arr.push(element.departmentName);

  });

  return arr;

}

How can I acheive it using lodash ?

asked Nov 19 '18 at 12:11

Samuel

1221219

I have an array userList:

[

  {email : 'abc@gmail.com',

  department : 'd1'},

  {email : 'abc@gmail.com',

  department : 'd2'},

  {email : 'dec@gmail.com',

  department : 'd1'},

]

I wanted it to be like :

[

  {

  email : 'abc@gmail.com',

  department : ['d1','d2']

  },

  {

  email : 'dec@gmail.com',

  department : ['d1']

  }

]

I achieved it using :

const userGrp = _.groupBy(userList, 'email');

let data = ;

for (let key in userGrp) {

    if (userGrp.hasOwnProperty(key)) {

        const obj = {

            email: key,

            dept: extractDept(userGrp[key]),

        };

        data.push(obj);

    }

}



function extractDept(userObjList) {

  const arr = ;

  userObjList.forEach((element) => {

    arr.push(element.departmentName);

  });

  return arr;

}

How can I acheive it using lodash ?

javascript lodash

asked Nov 19 '18 at 12:11

Samuel

1221219

asked Nov 19 '18 at 12:11

Samuel

1221219

asked Nov 19 '18 at 12:11

Samuel

1221219

asked Nov 19 '18 at 12:11

Samuel

1221219

asked Nov 19 '18 at 12:11

Samuel

1221219

add a comment |

3 Answers
3

active

oldest

votes

Since it's quite easy using plain js, here's the plain js way to group as you like

const grouped = [...foo.reduce((a, {email, department}) =>

     a.set(email, (a.get(email) || ).concat(department))

, new Map)].map(([email, department]) => ({email, department}));



console.log(grouped)

<script>

const foo = [

    {email : 'abc@gmail.com',

        department : 'd1'},

    {email : 'abc@gmail.com',

        department : 'd2'},

    {email : 'dec@gmail.com',

        department : 'd1'},

];



</script>

answered Nov 19 '18 at 12:16

bambam

45.1k873117

add a comment |

Here is a working example with Lodash : http://jsfiddle.net/houssein/u4dzLk2b/1/

   var data = [

      {email : 'abc@gmail.com',

      department : 'd1'},

      {email : 'abc@gmail.com',

      department : 'd2'},

      {email : 'dec@gmail.com',

      department : 'd1'},

    ];



    var result = _.chain(data)

        .groupBy("email")

        .pairs()

        .map(function (currentItem) {

            return _.object(_.zip(["email", "departement"], currentItem));

        })

        .value();

    console.log(result);

edited Nov 19 '18 at 12:27

answered Nov 19 '18 at 12:21

Houssein Zouari

373210

your output department property is not a array of string

– Samuel
Nov 19 '18 at 12:30

add a comment |

With Lodash grouping on email and using entries and the "maping" to get the required output:

const data = [{ email: 'abc@gmail.com', department: 'd1' }, { email: 'abc@gmail.com', department: 'd2' }, { email: 'dec@gmail.com', department: 'd1' }, ]



const result = _(data)

  .groupBy('email')

  .entries()

  .map(([k,v]) => ({email: k, departments: _.map(v, 'department')}))

  .value()



console.log(result)

<script src="https://cdnjs.cloudflare.com/ajax/libs/lodash.js/4.17.10/lodash.min.js"></script>

With ES6:

const data = [{ email: 'abc@gmail.com', department: 'd1' }, { email: 'abc@gmail.com', department: 'd2' }, { email: 'dec@gmail.com', department: 'd1' }, ]



const grp = data.reduce((r,c) => (r[c.email] = [...r[c.email] || , c], r), {})

console.log(Object.entries(grp).map(([k,v]) => 

   ({email: k, departments: v.map(x => x.department)})))

answered Nov 19 '18 at 17:10

Akrion

9,42711224

add a comment |

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3 Answers
3

active

oldest

votes

3 Answers
3

active

oldest

votes

Since it's quite easy using plain js, here's the plain js way to group as you like

const grouped = [...foo.reduce((a, {email, department}) =>

     a.set(email, (a.get(email) || ).concat(department))

, new Map)].map(([email, department]) => ({email, department}));



console.log(grouped)

<script>

const foo = [

    {email : 'abc@gmail.com',

        department : 'd1'},

    {email : 'abc@gmail.com',

        department : 'd2'},

    {email : 'dec@gmail.com',

        department : 'd1'},

];



</script>

answered Nov 19 '18 at 12:16

bambam

45.1k873117

add a comment |

Since it's quite easy using plain js, here's the plain js way to group as you like

const grouped = [...foo.reduce((a, {email, department}) =>

     a.set(email, (a.get(email) || ).concat(department))

, new Map)].map(([email, department]) => ({email, department}));



console.log(grouped)

<script>

const foo = [

    {email : 'abc@gmail.com',

        department : 'd1'},

    {email : 'abc@gmail.com',

        department : 'd2'},

    {email : 'dec@gmail.com',

        department : 'd1'},

];



</script>

answered Nov 19 '18 at 12:16

bambam

45.1k873117

add a comment |

Since it's quite easy using plain js, here's the plain js way to group as you like

const grouped = [...foo.reduce((a, {email, department}) =>

     a.set(email, (a.get(email) || ).concat(department))

, new Map)].map(([email, department]) => ({email, department}));



console.log(grouped)

<script>

const foo = [

    {email : 'abc@gmail.com',

        department : 'd1'},

    {email : 'abc@gmail.com',

        department : 'd2'},

    {email : 'dec@gmail.com',

        department : 'd1'},

];



</script>

answered Nov 19 '18 at 12:16

bambam

45.1k873117

Since it's quite easy using plain js, here's the plain js way to group as you like

const grouped = [...foo.reduce((a, {email, department}) =>

     a.set(email, (a.get(email) || ).concat(department))

, new Map)].map(([email, department]) => ({email, department}));



console.log(grouped)

<script>

const foo = [

    {email : 'abc@gmail.com',

        department : 'd1'},

    {email : 'abc@gmail.com',

        department : 'd2'},

    {email : 'dec@gmail.com',

        department : 'd1'},

];



</script>

const grouped = [...foo.reduce((a, {email, department}) =>

     a.set(email, (a.get(email) || ).concat(department))

, new Map)].map(([email, department]) => ({email, department}));



console.log(grouped)

<script>

const foo = [

    {email : 'abc@gmail.com',

        department : 'd1'},

    {email : 'abc@gmail.com',

        department : 'd2'},

    {email : 'dec@gmail.com',

        department : 'd1'},

];



</script>

const grouped = [...foo.reduce((a, {email, department}) =>

     a.set(email, (a.get(email) || ).concat(department))

, new Map)].map(([email, department]) => ({email, department}));



console.log(grouped)

<script>

const foo = [

    {email : 'abc@gmail.com',

        department : 'd1'},

    {email : 'abc@gmail.com',

        department : 'd2'},

    {email : 'dec@gmail.com',

        department : 'd1'},

];



</script>

answered Nov 19 '18 at 12:16

bambam

45.1k873117

answered Nov 19 '18 at 12:16

bambam

45.1k873117

answered Nov 19 '18 at 12:16

bambam

45.1k873117

answered Nov 19 '18 at 12:16

bambam

45.1k873117

add a comment |

Here is a working example with Lodash : http://jsfiddle.net/houssein/u4dzLk2b/1/

   var data = [

      {email : 'abc@gmail.com',

      department : 'd1'},

      {email : 'abc@gmail.com',

      department : 'd2'},

      {email : 'dec@gmail.com',

      department : 'd1'},

    ];



    var result = _.chain(data)

        .groupBy("email")

        .pairs()

        .map(function (currentItem) {

            return _.object(_.zip(["email", "departement"], currentItem));

        })

        .value();

    console.log(result);

edited Nov 19 '18 at 12:27

answered Nov 19 '18 at 12:21

Houssein Zouari

373210

your output department property is not a array of string

– Samuel
Nov 19 '18 at 12:30

add a comment |

Here is a working example with Lodash : http://jsfiddle.net/houssein/u4dzLk2b/1/

   var data = [

      {email : 'abc@gmail.com',

      department : 'd1'},

      {email : 'abc@gmail.com',

      department : 'd2'},

      {email : 'dec@gmail.com',

      department : 'd1'},

    ];



    var result = _.chain(data)

        .groupBy("email")

        .pairs()

        .map(function (currentItem) {

            return _.object(_.zip(["email", "departement"], currentItem));

        })

        .value();

    console.log(result);

edited Nov 19 '18 at 12:27

answered Nov 19 '18 at 12:21

Houssein Zouari

373210

your output department property is not a array of string

– Samuel
Nov 19 '18 at 12:30

add a comment |

Here is a working example with Lodash : http://jsfiddle.net/houssein/u4dzLk2b/1/

   var data = [

      {email : 'abc@gmail.com',

      department : 'd1'},

      {email : 'abc@gmail.com',

      department : 'd2'},

      {email : 'dec@gmail.com',

      department : 'd1'},

    ];



    var result = _.chain(data)

        .groupBy("email")

        .pairs()

        .map(function (currentItem) {

            return _.object(_.zip(["email", "departement"], currentItem));

        })

        .value();

    console.log(result);

edited Nov 19 '18 at 12:27

answered Nov 19 '18 at 12:21

Houssein Zouari

373210

Here is a working example with Lodash : http://jsfiddle.net/houssein/u4dzLk2b/1/

   var data = [

      {email : 'abc@gmail.com',

      department : 'd1'},

      {email : 'abc@gmail.com',

      department : 'd2'},

      {email : 'dec@gmail.com',

      department : 'd1'},

    ];



    var result = _.chain(data)

        .groupBy("email")

        .pairs()

        .map(function (currentItem) {

            return _.object(_.zip(["email", "departement"], currentItem));

        })

        .value();

    console.log(result);

edited Nov 19 '18 at 12:27

answered Nov 19 '18 at 12:21

Houssein Zouari

373210

edited Nov 19 '18 at 12:27

answered Nov 19 '18 at 12:21

Houssein Zouari

373210

answered Nov 19 '18 at 12:21

Houssein Zouari

373210

answered Nov 19 '18 at 12:21

Houssein Zouari

373210

your output department property is not a array of string

– Samuel
Nov 19 '18 at 12:30

add a comment |

your output department property is not a array of string

– Samuel
Nov 19 '18 at 12:30

your output department property is not a array of string

– Samuel
Nov 19 '18 at 12:30

add a comment |

With Lodash grouping on email and using entries and the "maping" to get the required output:

const data = [{ email: 'abc@gmail.com', department: 'd1' }, { email: 'abc@gmail.com', department: 'd2' }, { email: 'dec@gmail.com', department: 'd1' }, ]



const result = _(data)

  .groupBy('email')

  .entries()

  .map(([k,v]) => ({email: k, departments: _.map(v, 'department')}))

  .value()



console.log(result)

<script src="https://cdnjs.cloudflare.com/ajax/libs/lodash.js/4.17.10/lodash.min.js"></script>

With ES6:

const data = [{ email: 'abc@gmail.com', department: 'd1' }, { email: 'abc@gmail.com', department: 'd2' }, { email: 'dec@gmail.com', department: 'd1' }, ]



const grp = data.reduce((r,c) => (r[c.email] = [...r[c.email] || , c], r), {})

console.log(Object.entries(grp).map(([k,v]) => 

   ({email: k, departments: v.map(x => x.department)})))

answered Nov 19 '18 at 17:10

Akrion

9,42711224

add a comment |

With Lodash grouping on email and using entries and the "maping" to get the required output:

const data = [{ email: 'abc@gmail.com', department: 'd1' }, { email: 'abc@gmail.com', department: 'd2' }, { email: 'dec@gmail.com', department: 'd1' }, ]



const result = _(data)

  .groupBy('email')

  .entries()

  .map(([k,v]) => ({email: k, departments: _.map(v, 'department')}))

  .value()



console.log(result)

<script src="https://cdnjs.cloudflare.com/ajax/libs/lodash.js/4.17.10/lodash.min.js"></script>

With ES6:

const data = [{ email: 'abc@gmail.com', department: 'd1' }, { email: 'abc@gmail.com', department: 'd2' }, { email: 'dec@gmail.com', department: 'd1' }, ]



const grp = data.reduce((r,c) => (r[c.email] = [...r[c.email] || , c], r), {})

console.log(Object.entries(grp).map(([k,v]) => 

   ({email: k, departments: v.map(x => x.department)})))

answered Nov 19 '18 at 17:10

Akrion

9,42711224

add a comment |

With Lodash grouping on email and using entries and the "maping" to get the required output:

const data = [{ email: 'abc@gmail.com', department: 'd1' }, { email: 'abc@gmail.com', department: 'd2' }, { email: 'dec@gmail.com', department: 'd1' }, ]



const result = _(data)

  .groupBy('email')

  .entries()

  .map(([k,v]) => ({email: k, departments: _.map(v, 'department')}))

  .value()



console.log(result)

<script src="https://cdnjs.cloudflare.com/ajax/libs/lodash.js/4.17.10/lodash.min.js"></script>

With ES6:

const data = [{ email: 'abc@gmail.com', department: 'd1' }, { email: 'abc@gmail.com', department: 'd2' }, { email: 'dec@gmail.com', department: 'd1' }, ]



const grp = data.reduce((r,c) => (r[c.email] = [...r[c.email] || , c], r), {})

console.log(Object.entries(grp).map(([k,v]) => 

   ({email: k, departments: v.map(x => x.department)})))

answered Nov 19 '18 at 17:10

Akrion

9,42711224

With Lodash grouping on email and using entries and the "maping" to get the required output:

const data = [{ email: 'abc@gmail.com', department: 'd1' }, { email: 'abc@gmail.com', department: 'd2' }, { email: 'dec@gmail.com', department: 'd1' }, ]



const result = _(data)

  .groupBy('email')

  .entries()

  .map(([k,v]) => ({email: k, departments: _.map(v, 'department')}))

  .value()



console.log(result)

<script src="https://cdnjs.cloudflare.com/ajax/libs/lodash.js/4.17.10/lodash.min.js"></script>

With ES6:

const data = [{ email: 'abc@gmail.com', department: 'd1' }, { email: 'abc@gmail.com', department: 'd2' }, { email: 'dec@gmail.com', department: 'd1' }, ]



const grp = data.reduce((r,c) => (r[c.email] = [...r[c.email] || , c], r), {})

console.log(Object.entries(grp).map(([k,v]) => 

   ({email: k, departments: v.map(x => x.department)})))

const data = [{ email: 'abc@gmail.com', department: 'd1' }, { email: 'abc@gmail.com', department: 'd2' }, { email: 'dec@gmail.com', department: 'd1' }, ]



const result = _(data)

  .groupBy('email')

  .entries()

  .map(([k,v]) => ({email: k, departments: _.map(v, 'department')}))

  .value()



console.log(result)

<script src="https://cdnjs.cloudflare.com/ajax/libs/lodash.js/4.17.10/lodash.min.js"></script>

const data = [{ email: 'abc@gmail.com', department: 'd1' }, { email: 'abc@gmail.com', department: 'd2' }, { email: 'dec@gmail.com', department: 'd1' }, ]



const result = _(data)

  .groupBy('email')

  .entries()

  .map(([k,v]) => ({email: k, departments: _.map(v, 'department')}))

  .value()



console.log(result)

<script src="https://cdnjs.cloudflare.com/ajax/libs/lodash.js/4.17.10/lodash.min.js"></script>

const data = [{ email: 'abc@gmail.com', department: 'd1' }, { email: 'abc@gmail.com', department: 'd2' }, { email: 'dec@gmail.com', department: 'd1' }, ]



const grp = data.reduce((r,c) => (r[c.email] = [...r[c.email] || , c], r), {})

console.log(Object.entries(grp).map(([k,v]) => 

   ({email: k, departments: v.map(x => x.department)})))

const data = [{ email: 'abc@gmail.com', department: 'd1' }, { email: 'abc@gmail.com', department: 'd2' }, { email: 'dec@gmail.com', department: 'd1' }, ]



const grp = data.reduce((r,c) => (r[c.email] = [...r[c.email] || , c], r), {})

console.log(Object.entries(grp).map(([k,v]) => 

   ({email: k, departments: v.map(x => x.department)})))

answered Nov 19 '18 at 17:10

Akrion

9,42711224

answered Nov 19 '18 at 17:10

Akrion

9,42711224

answered Nov 19 '18 at 17:10

Akrion

9,42711224

answered Nov 19 '18 at 17:10

Akrion

9,42711224

add a comment |

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