How to count unique value from object of array in javascript

I want to calculate number of unique value and put that in new array.
I have below array:

[

  { CategoryId: "b5c3f43f941c", CategoryName: "Category 1", CategoryColor: "cgreen" }

  { CategoryId: "9872cce5af92", CategoryName: "Category 2", CategoryColor: "purple" }

  { CategoryId: "b5c3f43f941c", CategoryName: "Category 1", CategoryColor: "cgreen" }

]

I want new array with below result:

[

    { CategoryId: "b5c3f43f941c", count: 2, CategoryColor: "cgreen" }

    { CategoryId: "9872cce5af92", count: 1, CategoryColor: "purple" }

]

In this check by id, if id is same show count and new in new array.

Hope you understand what I want.

Thanks,

asked Nov 13 at 11:32

rohit13807

307213

add a comment |

I want to calculate number of unique value and put that in new array.
I have below array:

[

  { CategoryId: "b5c3f43f941c", CategoryName: "Category 1", CategoryColor: "cgreen" }

  { CategoryId: "9872cce5af92", CategoryName: "Category 2", CategoryColor: "purple" }

  { CategoryId: "b5c3f43f941c", CategoryName: "Category 1", CategoryColor: "cgreen" }

]

I want new array with below result:

[

    { CategoryId: "b5c3f43f941c", count: 2, CategoryColor: "cgreen" }

    { CategoryId: "9872cce5af92", count: 1, CategoryColor: "purple" }

]

In this check by id, if id is same show count and new in new array.

Hope you understand what I want.

Thanks,

asked Nov 13 at 11:32

rohit13807

307213

add a comment |

I want to calculate number of unique value and put that in new array.
I have below array:

[

  { CategoryId: "b5c3f43f941c", CategoryName: "Category 1", CategoryColor: "cgreen" }

  { CategoryId: "9872cce5af92", CategoryName: "Category 2", CategoryColor: "purple" }

  { CategoryId: "b5c3f43f941c", CategoryName: "Category 1", CategoryColor: "cgreen" }

]

I want new array with below result:

[

    { CategoryId: "b5c3f43f941c", count: 2, CategoryColor: "cgreen" }

    { CategoryId: "9872cce5af92", count: 1, CategoryColor: "purple" }

]

In this check by id, if id is same show count and new in new array.

Hope you understand what I want.

Thanks,

asked Nov 13 at 11:32

rohit13807

307213

I want to calculate number of unique value and put that in new array.
I have below array:

[

  { CategoryId: "b5c3f43f941c", CategoryName: "Category 1", CategoryColor: "cgreen" }

  { CategoryId: "9872cce5af92", CategoryName: "Category 2", CategoryColor: "purple" }

  { CategoryId: "b5c3f43f941c", CategoryName: "Category 1", CategoryColor: "cgreen" }

]

I want new array with below result:

[

    { CategoryId: "b5c3f43f941c", count: 2, CategoryColor: "cgreen" }

    { CategoryId: "9872cce5af92", count: 1, CategoryColor: "purple" }

]

In this check by id, if id is same show count and new in new array.

Hope you understand what I want.

Thanks,

javascript arrays array-push

asked Nov 13 at 11:32

rohit13807

307213

asked Nov 13 at 11:32

rohit13807

307213

asked Nov 13 at 11:32

rohit13807

307213

asked Nov 13 at 11:32

rohit13807

307213

asked Nov 13 at 11:32

rohit13807

307213

add a comment |

4 Answers
4

active

oldest

votes

You can loop through array using "for..of" and create a temporary object to save data in every loop. If same id exists in tempObject then increment count by 1

var arr = [

  { CategoryId: "b5c3f43f941c", CategoryName: "Category 1", CategoryColor: "cgreen" }

  , { CategoryId: "9872cce5af92", CategoryName: "Category 2", CategoryColor: "purple" }

  , { CategoryId: "b5c3f43f941c", CategoryName: "Category 1", CategoryColor: "cgreen" }

]



var tempResult = {}



for(let { CategoryColor, CategoryId } of arr)

  tempResult[CategoryId] = { 

      CategoryId, 

      CategoryColor, 

      count: tempResult[CategoryId] ? tempResult[CategoryId].count + 1 : 1

  }      



let result = Object.values(tempResult)



console.log(result)

edited Nov 13 at 11:47

answered Nov 13 at 11:40

Nitish Narang

2,948815

add a comment |

Use reduce function and inside the callback check an object exist whose CategoryId matches. If matches then update the count or else create a new object with the values and push in the array

let k = [{

    CategoryId: "b5c3f43f941c",

    CategoryName: "Category 1",

    CategoryColor: "cgreen"

  },

  {

    CategoryId: "9872cce5af92",

    CategoryName: "Category 2",

    CategoryColor: "purple"

  },

  {

    CategoryId: "b5c3f43f941c",

    CategoryName: "Category 1",

    CategoryColor: "cgreen"

  }

]



let result = k.reduce(function(acc, curr) {

  // Check if there exist an object in empty array whose CategoryId matches

  let isElemExist = acc.findIndex(function(item) {

    return item.CategoryId === curr.CategoryId;

  })

  if (isElemExist === -1) {

    let obj = {};

    obj.CategoryId = curr.CategoryId;

    obj.count = 1;

    obj.CategoryColor = curr.CategoryColor;

    acc.push(obj)

  } else {

    acc[isElemExist].count += 1

  }

  return acc;



}, )



console.log(result)

answered Nov 13 at 11:40

brk

25.4k31939

add a comment |

const array_unique = require('array-hyper-unique').array_unique



let arr = [

  { CategoryId: "b5c3f43f941c", CategoryName: "Category 1", CategoryColor: "cgreen" }

  { CategoryId: "9872cce5af92", CategoryName: "Category 2", CategoryColor: "purple" }

  { CategoryId: "b5c3f43f941c", CategoryName: "Category 1", CategoryColor: "cgreen" }

]



array_unique(arr).length

answered Nov 13 at 12:19

bluelovers

1538

add a comment |

You can sort the array first then count the duplicates. The downside is it will modify the original yourArray due to being sorted, so use with caution.

yourArray.sort((a, b) => {

  if (a.CategoryName > b.CategoryName) {

    return 1;

  }

  if (a.CategoryName < b.CategoryName) {

    return -1;

  }

  return 0;

});



var pivot = yourArray[0];

pivot.count = 0;

var counted = [pivot];

yourArray.forEach(item => {

  if (item.CategoryId === pivot.CategoryId) {

    pivot.count++;

  } else {

    pivot = item;

    pivot.count = 1;

    counted.push(pivot);

  }

});

answered Nov 13 at 13:43

ptdien

744

add a comment |

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4 Answers
4

active

oldest

votes

4 Answers
4

active

oldest

votes

You can loop through array using "for..of" and create a temporary object to save data in every loop. If same id exists in tempObject then increment count by 1

var arr = [

  { CategoryId: "b5c3f43f941c", CategoryName: "Category 1", CategoryColor: "cgreen" }

  , { CategoryId: "9872cce5af92", CategoryName: "Category 2", CategoryColor: "purple" }

  , { CategoryId: "b5c3f43f941c", CategoryName: "Category 1", CategoryColor: "cgreen" }

]



var tempResult = {}



for(let { CategoryColor, CategoryId } of arr)

  tempResult[CategoryId] = { 

      CategoryId, 

      CategoryColor, 

      count: tempResult[CategoryId] ? tempResult[CategoryId].count + 1 : 1

  }      



let result = Object.values(tempResult)



console.log(result)

edited Nov 13 at 11:47

answered Nov 13 at 11:40

Nitish Narang

2,948815

add a comment |

You can loop through array using "for..of" and create a temporary object to save data in every loop. If same id exists in tempObject then increment count by 1

var arr = [

  { CategoryId: "b5c3f43f941c", CategoryName: "Category 1", CategoryColor: "cgreen" }

  , { CategoryId: "9872cce5af92", CategoryName: "Category 2", CategoryColor: "purple" }

  , { CategoryId: "b5c3f43f941c", CategoryName: "Category 1", CategoryColor: "cgreen" }

]



var tempResult = {}



for(let { CategoryColor, CategoryId } of arr)

  tempResult[CategoryId] = { 

      CategoryId, 

      CategoryColor, 

      count: tempResult[CategoryId] ? tempResult[CategoryId].count + 1 : 1

  }      



let result = Object.values(tempResult)



console.log(result)

edited Nov 13 at 11:47

answered Nov 13 at 11:40

Nitish Narang

2,948815

add a comment |

You can loop through array using "for..of" and create a temporary object to save data in every loop. If same id exists in tempObject then increment count by 1

var arr = [

  { CategoryId: "b5c3f43f941c", CategoryName: "Category 1", CategoryColor: "cgreen" }

  , { CategoryId: "9872cce5af92", CategoryName: "Category 2", CategoryColor: "purple" }

  , { CategoryId: "b5c3f43f941c", CategoryName: "Category 1", CategoryColor: "cgreen" }

]



var tempResult = {}



for(let { CategoryColor, CategoryId } of arr)

  tempResult[CategoryId] = { 

      CategoryId, 

      CategoryColor, 

      count: tempResult[CategoryId] ? tempResult[CategoryId].count + 1 : 1

  }      



let result = Object.values(tempResult)



console.log(result)

edited Nov 13 at 11:47

answered Nov 13 at 11:40

Nitish Narang

2,948815

You can loop through array using "for..of" and create a temporary object to save data in every loop. If same id exists in tempObject then increment count by 1

var arr = [

  { CategoryId: "b5c3f43f941c", CategoryName: "Category 1", CategoryColor: "cgreen" }

  , { CategoryId: "9872cce5af92", CategoryName: "Category 2", CategoryColor: "purple" }

  , { CategoryId: "b5c3f43f941c", CategoryName: "Category 1", CategoryColor: "cgreen" }

]



var tempResult = {}



for(let { CategoryColor, CategoryId } of arr)

  tempResult[CategoryId] = { 

      CategoryId, 

      CategoryColor, 

      count: tempResult[CategoryId] ? tempResult[CategoryId].count + 1 : 1

  }      



let result = Object.values(tempResult)



console.log(result)

var arr = [

  { CategoryId: "b5c3f43f941c", CategoryName: "Category 1", CategoryColor: "cgreen" }

  , { CategoryId: "9872cce5af92", CategoryName: "Category 2", CategoryColor: "purple" }

  , { CategoryId: "b5c3f43f941c", CategoryName: "Category 1", CategoryColor: "cgreen" }

]



var tempResult = {}



for(let { CategoryColor, CategoryId } of arr)

  tempResult[CategoryId] = { 

      CategoryId, 

      CategoryColor, 

      count: tempResult[CategoryId] ? tempResult[CategoryId].count + 1 : 1

  }      



let result = Object.values(tempResult)



console.log(result)

var arr = [

  { CategoryId: "b5c3f43f941c", CategoryName: "Category 1", CategoryColor: "cgreen" }

  , { CategoryId: "9872cce5af92", CategoryName: "Category 2", CategoryColor: "purple" }

  , { CategoryId: "b5c3f43f941c", CategoryName: "Category 1", CategoryColor: "cgreen" }

]



var tempResult = {}



for(let { CategoryColor, CategoryId } of arr)

  tempResult[CategoryId] = { 

      CategoryId, 

      CategoryColor, 

      count: tempResult[CategoryId] ? tempResult[CategoryId].count + 1 : 1

  }      



let result = Object.values(tempResult)



console.log(result)

edited Nov 13 at 11:47

answered Nov 13 at 11:40

Nitish Narang

2,948815

edited Nov 13 at 11:47

answered Nov 13 at 11:40

Nitish Narang

2,948815

answered Nov 13 at 11:40

Nitish Narang

2,948815

answered Nov 13 at 11:40

Nitish Narang

2,948815

add a comment |

Use reduce function and inside the callback check an object exist whose CategoryId matches. If matches then update the count or else create a new object with the values and push in the array

let k = [{

    CategoryId: "b5c3f43f941c",

    CategoryName: "Category 1",

    CategoryColor: "cgreen"

  },

  {

    CategoryId: "9872cce5af92",

    CategoryName: "Category 2",

    CategoryColor: "purple"

  },

  {

    CategoryId: "b5c3f43f941c",

    CategoryName: "Category 1",

    CategoryColor: "cgreen"

  }

]



let result = k.reduce(function(acc, curr) {

  // Check if there exist an object in empty array whose CategoryId matches

  let isElemExist = acc.findIndex(function(item) {

    return item.CategoryId === curr.CategoryId;

  })

  if (isElemExist === -1) {

    let obj = {};

    obj.CategoryId = curr.CategoryId;

    obj.count = 1;

    obj.CategoryColor = curr.CategoryColor;

    acc.push(obj)

  } else {

    acc[isElemExist].count += 1

  }

  return acc;



}, )



console.log(result)

answered Nov 13 at 11:40

brk

25.4k31939

add a comment |

Use reduce function and inside the callback check an object exist whose CategoryId matches. If matches then update the count or else create a new object with the values and push in the array

let k = [{

    CategoryId: "b5c3f43f941c",

    CategoryName: "Category 1",

    CategoryColor: "cgreen"

  },

  {

    CategoryId: "9872cce5af92",

    CategoryName: "Category 2",

    CategoryColor: "purple"

  },

  {

    CategoryId: "b5c3f43f941c",

    CategoryName: "Category 1",

    CategoryColor: "cgreen"

  }

]



let result = k.reduce(function(acc, curr) {

  // Check if there exist an object in empty array whose CategoryId matches

  let isElemExist = acc.findIndex(function(item) {

    return item.CategoryId === curr.CategoryId;

  })

  if (isElemExist === -1) {

    let obj = {};

    obj.CategoryId = curr.CategoryId;

    obj.count = 1;

    obj.CategoryColor = curr.CategoryColor;

    acc.push(obj)

  } else {

    acc[isElemExist].count += 1

  }

  return acc;



}, )



console.log(result)

answered Nov 13 at 11:40

brk

25.4k31939

add a comment |

Use reduce function and inside the callback check an object exist whose CategoryId matches. If matches then update the count or else create a new object with the values and push in the array

let k = [{

    CategoryId: "b5c3f43f941c",

    CategoryName: "Category 1",

    CategoryColor: "cgreen"

  },

  {

    CategoryId: "9872cce5af92",

    CategoryName: "Category 2",

    CategoryColor: "purple"

  },

  {

    CategoryId: "b5c3f43f941c",

    CategoryName: "Category 1",

    CategoryColor: "cgreen"

  }

]



let result = k.reduce(function(acc, curr) {

  // Check if there exist an object in empty array whose CategoryId matches

  let isElemExist = acc.findIndex(function(item) {

    return item.CategoryId === curr.CategoryId;

  })

  if (isElemExist === -1) {

    let obj = {};

    obj.CategoryId = curr.CategoryId;

    obj.count = 1;

    obj.CategoryColor = curr.CategoryColor;

    acc.push(obj)

  } else {

    acc[isElemExist].count += 1

  }

  return acc;



}, )



console.log(result)

answered Nov 13 at 11:40

brk

25.4k31939

Use reduce function and inside the callback check an object exist whose CategoryId matches. If matches then update the count or else create a new object with the values and push in the array

let k = [{

    CategoryId: "b5c3f43f941c",

    CategoryName: "Category 1",

    CategoryColor: "cgreen"

  },

  {

    CategoryId: "9872cce5af92",

    CategoryName: "Category 2",

    CategoryColor: "purple"

  },

  {

    CategoryId: "b5c3f43f941c",

    CategoryName: "Category 1",

    CategoryColor: "cgreen"

  }

]



let result = k.reduce(function(acc, curr) {

  // Check if there exist an object in empty array whose CategoryId matches

  let isElemExist = acc.findIndex(function(item) {

    return item.CategoryId === curr.CategoryId;

  })

  if (isElemExist === -1) {

    let obj = {};

    obj.CategoryId = curr.CategoryId;

    obj.count = 1;

    obj.CategoryColor = curr.CategoryColor;

    acc.push(obj)

  } else {

    acc[isElemExist].count += 1

  }

  return acc;



}, )



console.log(result)

let k = [{

    CategoryId: "b5c3f43f941c",

    CategoryName: "Category 1",

    CategoryColor: "cgreen"

  },

  {

    CategoryId: "9872cce5af92",

    CategoryName: "Category 2",

    CategoryColor: "purple"

  },

  {

    CategoryId: "b5c3f43f941c",

    CategoryName: "Category 1",

    CategoryColor: "cgreen"

  }

]



let result = k.reduce(function(acc, curr) {

  // Check if there exist an object in empty array whose CategoryId matches

  let isElemExist = acc.findIndex(function(item) {

    return item.CategoryId === curr.CategoryId;

  })

  if (isElemExist === -1) {

    let obj = {};

    obj.CategoryId = curr.CategoryId;

    obj.count = 1;

    obj.CategoryColor = curr.CategoryColor;

    acc.push(obj)

  } else {

    acc[isElemExist].count += 1

  }

  return acc;



}, )



console.log(result)

let k = [{

    CategoryId: "b5c3f43f941c",

    CategoryName: "Category 1",

    CategoryColor: "cgreen"

  },

  {

    CategoryId: "9872cce5af92",

    CategoryName: "Category 2",

    CategoryColor: "purple"

  },

  {

    CategoryId: "b5c3f43f941c",

    CategoryName: "Category 1",

    CategoryColor: "cgreen"

  }

]



let result = k.reduce(function(acc, curr) {

  // Check if there exist an object in empty array whose CategoryId matches

  let isElemExist = acc.findIndex(function(item) {

    return item.CategoryId === curr.CategoryId;

  })

  if (isElemExist === -1) {

    let obj = {};

    obj.CategoryId = curr.CategoryId;

    obj.count = 1;

    obj.CategoryColor = curr.CategoryColor;

    acc.push(obj)

  } else {

    acc[isElemExist].count += 1

  }

  return acc;



}, )



console.log(result)

answered Nov 13 at 11:40

brk

25.4k31939

answered Nov 13 at 11:40

brk

25.4k31939

answered Nov 13 at 11:40

brk

25.4k31939

answered Nov 13 at 11:40

brk

25.4k31939

add a comment |

const array_unique = require('array-hyper-unique').array_unique



let arr = [

  { CategoryId: "b5c3f43f941c", CategoryName: "Category 1", CategoryColor: "cgreen" }

  { CategoryId: "9872cce5af92", CategoryName: "Category 2", CategoryColor: "purple" }

  { CategoryId: "b5c3f43f941c", CategoryName: "Category 1", CategoryColor: "cgreen" }

]



array_unique(arr).length

answered Nov 13 at 12:19

bluelovers

1538

add a comment |

const array_unique = require('array-hyper-unique').array_unique



let arr = [

  { CategoryId: "b5c3f43f941c", CategoryName: "Category 1", CategoryColor: "cgreen" }

  { CategoryId: "9872cce5af92", CategoryName: "Category 2", CategoryColor: "purple" }

  { CategoryId: "b5c3f43f941c", CategoryName: "Category 1", CategoryColor: "cgreen" }

]



array_unique(arr).length

answered Nov 13 at 12:19

bluelovers

1538

add a comment |

const array_unique = require('array-hyper-unique').array_unique



let arr = [

  { CategoryId: "b5c3f43f941c", CategoryName: "Category 1", CategoryColor: "cgreen" }

  { CategoryId: "9872cce5af92", CategoryName: "Category 2", CategoryColor: "purple" }

  { CategoryId: "b5c3f43f941c", CategoryName: "Category 1", CategoryColor: "cgreen" }

]



array_unique(arr).length

answered Nov 13 at 12:19

bluelovers

1538

const array_unique = require('array-hyper-unique').array_unique



let arr = [

  { CategoryId: "b5c3f43f941c", CategoryName: "Category 1", CategoryColor: "cgreen" }

  { CategoryId: "9872cce5af92", CategoryName: "Category 2", CategoryColor: "purple" }

  { CategoryId: "b5c3f43f941c", CategoryName: "Category 1", CategoryColor: "cgreen" }

]



array_unique(arr).length

answered Nov 13 at 12:19

bluelovers

1538

answered Nov 13 at 12:19

bluelovers

1538

answered Nov 13 at 12:19

bluelovers

1538

answered Nov 13 at 12:19

bluelovers

1538

add a comment |

You can sort the array first then count the duplicates. The downside is it will modify the original yourArray due to being sorted, so use with caution.

yourArray.sort((a, b) => {

  if (a.CategoryName > b.CategoryName) {

    return 1;

  }

  if (a.CategoryName < b.CategoryName) {

    return -1;

  }

  return 0;

});



var pivot = yourArray[0];

pivot.count = 0;

var counted = [pivot];

yourArray.forEach(item => {

  if (item.CategoryId === pivot.CategoryId) {

    pivot.count++;

  } else {

    pivot = item;

    pivot.count = 1;

    counted.push(pivot);

  }

});

answered Nov 13 at 13:43

ptdien

744

add a comment |

You can sort the array first then count the duplicates. The downside is it will modify the original yourArray due to being sorted, so use with caution.

yourArray.sort((a, b) => {

  if (a.CategoryName > b.CategoryName) {

    return 1;

  }

  if (a.CategoryName < b.CategoryName) {

    return -1;

  }

  return 0;

});



var pivot = yourArray[0];

pivot.count = 0;

var counted = [pivot];

yourArray.forEach(item => {

  if (item.CategoryId === pivot.CategoryId) {

    pivot.count++;

  } else {

    pivot = item;

    pivot.count = 1;

    counted.push(pivot);

  }

});

answered Nov 13 at 13:43

ptdien

744

add a comment |

You can sort the array first then count the duplicates. The downside is it will modify the original yourArray due to being sorted, so use with caution.

yourArray.sort((a, b) => {

  if (a.CategoryName > b.CategoryName) {

    return 1;

  }

  if (a.CategoryName < b.CategoryName) {

    return -1;

  }

  return 0;

});



var pivot = yourArray[0];

pivot.count = 0;

var counted = [pivot];

yourArray.forEach(item => {

  if (item.CategoryId === pivot.CategoryId) {

    pivot.count++;

  } else {

    pivot = item;

    pivot.count = 1;

    counted.push(pivot);

  }

});

answered Nov 13 at 13:43

ptdien

744

You can sort the array first then count the duplicates. The downside is it will modify the original yourArray due to being sorted, so use with caution.

yourArray.sort((a, b) => {

  if (a.CategoryName > b.CategoryName) {

    return 1;

  }

  if (a.CategoryName < b.CategoryName) {

    return -1;

  }

  return 0;

});



var pivot = yourArray[0];

pivot.count = 0;

var counted = [pivot];

yourArray.forEach(item => {

  if (item.CategoryId === pivot.CategoryId) {

    pivot.count++;

  } else {

    pivot = item;

    pivot.count = 1;

    counted.push(pivot);

  }

});

answered Nov 13 at 13:43

ptdien

744

answered Nov 13 at 13:43

ptdien

744

answered Nov 13 at 13:43

ptdien

744

answered Nov 13 at 13:43

ptdien

744

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