manipulate two array of objects make new array and update the attribute of object1 and add in the new array

Question

Hi I am trying to compare two array of objects and want to achieve the custom array of object by manipulating it.

I would like to achieve something like this by checking each time anything from object1 is removed or not? if it is removed then it should change attribute to 'Y'.

object 1 = [
   {
      "label":"a",
      "removed":"N",
      "value":1
   },
   {
      "label":"b",
      "removed":"N",
      "value":2
   }
]

object 2 =[
   {
      "label":"a",
      "removed":"N",
      "value":1
   },
   {
      "label":"c",
      "removed":"N",
      "value":3
   }
]

result should be =

[{
label:"a",
removed:"N",
value:1
},{
label:"b",
removed:"Y",
value:2
},{
label:"c",
removed:"N",
value:3
}]

I have tried to loop both array and tried to achieve the same but it is somehow not working.

I tried following code.

let data = []

object1.forEach((item1) => {

            object2.forEach((item2) => {

                    if (item1.value === item2.value) {
                        data.push(Object.assign(item1));
                    } else {
                        item2.removeFlag = 'Y';
                        data.push(Object.assign(item1, item2));

                    }
                }

            }

...Updated Question.....

obj1 = [
   {
      "val":"type1",
      "removed":"N",
      "data":[
         {
            "label":"type1-a",
            "removed":"N",
            "dataid":16
         },
         {
            "label":"type1-b",
            "removed":"N",
            "dataid":26
         }
      ]
   },
   {
      "val":"type2",
      "removed":"N",
      "data":[
         {
            "label":"type2-a",
            "removed":"N",
            "dataid":12
         },
         {
            "label":"type2-b",
            "removed":"N",
            "dataid":34
         }
      ]
   },
   {
      "val":"type3",
      "removed":"N",
      "id":124,
      "label":"type3-label1"
   },
   {
      "val":"type4",
      "removed":"N",
      "id":126,
      "label":"type4-label1"
   },
   {
      "val":"type4",
      "removed":"N",
      "id":128,
      "label":"type4-label2"
   }
]

obj2 = [
   {
      "val":"type1",
      "removed":"N",
      "data":[
         {
            "label":"type1-a",
            "removed":"N",
            "dataid":16
         },
         {
            "label":"type1-c",
            "removed":null,
            "dataid":null
         },
         {
            "label":"type1-d",
            "removed":null,
            "dataid":null
         }
      ]
   },
   {
      "val":"type3",
      "removed":"N",
      "id":124,
      "label":"type3-label1"
   },
   {
      "val":"type4",
      "removed":"N",
      "id":126,
      "label":"type4-label1"
   },
   {
      "val":"type4",
      "removed":null,
      "id":null,
      "label":"type4-label3"
   }
]

result = [
   {
      "val":"type1",
      "removed":"N",
      "data":[
         {
            "label":"type1-a",
            "removed":"N",
            "dataid":16
         },
         {
            "label":"type1-b",
            "removed":"Y",
            "dataid":26
         },
         {
            "label":"type1-c",
            "removed":null,
            "dataid":null
         },
         {
            "label":"type1-d",
            "removed":null,
            "dataid":null
         }
      ]
   },
   {
      "val":"type2",
      "removed":"Y",
      "data":[
         {
            "label":"type2-a",
            "removed":"N",
            "dataid":12
         },
         {
            "label":"type2-b",
            "removed":"N",
            "dataid":34
         }
      ]
   },
   {
      "val":"type3",
      "removed":"N",
      "id":124,
      "label":"type3-label1"
   },
   {
      "val":"type4",
      "removed":"N",
      "id":126,
      "label":"type4-label1"
   },
   {
      "val":"type4",
      "removed":"Y",
      "id":128,
      "label":"type4-label2"
   },
   {
      "val":"type4",
      "removed":null,
      "id":null,
      "label":"type4-label3"
   }
]

You want the result array to contain the values that have the same 'label' in both arrays, but also the object in array 1 that is not is array 2 with the removed field changed to 'Y'. Please explain what am I missing if this not the result you want. — subashMahapatra
– subashMahapatra, Commented May 21, 2020 at 20:44
yes exactly, I am looking for the result array which will track object1 and if the object1 is missing in object2 it will add and change the change removed field to 'Y'. It is basically tracking if something is removed from the object1. — Bravo
– Bravo, Commented May 21, 2020 at 20:47

Józef Podlecki · Accepted Answer · 2020-05-22 13:55:38Z

1

const object1 = [{
    "label": "a",
    "removed": "N",
    "value": 1
  },
  {
    "label": "b",
    "removed": "N",
    "value": 2
  }
]

const object2 = [{
    "label": "a",
    "removed": "N",
    "value": 1
  },
  {
    "label": "c",
    "removed": "N",
    "value": 3
  }
]

const result = [...object2.map(record => {
  const record2 = object1.find(pr => pr.label === record.label) || {};

  return {
    ...record,
    ...record2
  }
}), ...object1.filter(pr => !object2.some(npr => npr.label === pr.label)).map(pr => ({ ...pr,
  removed: "Y"
}))]

console.log(result);

--Edit

With nested data you have to repeat the same code inside reduce function.

Example


const result = [...object2.map(record => {
  const record2 = object1.find(pr => pr.val === record.val) || {};

  const data = [...(record.data || []).map(pr => ({ ...pr,
      ...(record2.data.find(npr => npr.label === pr.label) || {})
    })),
    ...(record2.data || []).filter(pr => !record.data.some(npr => npr.label === pr.label)).map(pr => ({ ...pr,
      removed: 'Y'
    }))
  ]

  return {
    ...record,
    ...record2,
    data

  }
}), ...object1.filter(pr => !object2.some(npr => npr.val === pr.val)).map(pr => ({ ...pr,
  removed: "Y"
}))]

edited May 22, 2020 at 13:55

answered May 21, 2020 at 20:45

Józef Podlecki

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12 Comments

Bravo Over a year ago

thanks Jozef, I have one question in regards to nested array of objects, can we use same compare method or we need to iterate differently.

Józef Podlecki Over a year ago

Updated answer. There will be just more logic in reduce function

Józef Podlecki Over a year ago

I think it would be much better to start a new question

Bravo Over a year ago

please check above link. @Józef Podlecki

Bravo Over a year ago

stackoverflow.com/questions/62707256/…

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