How to combine array of objects into one object and then create another object within that array based on a condition on the index

Question

I have an array of objects that i need to flatten/simplify/combine based on certain conditions. Here is the shape of my current array of objects below:

const arrayOfObjects = 
  [ { Battery           : 'Battery'        } 
  , { batteryDetailsKey : [ 'Serial Number', 'Type', 'Part Number'       ] } 
  , { batteryDetailsVal : [ 'HJ3CA19347410218LJ98 100 QC', 'Extended Range', '4P94-Q001' ] } 
  , { Modules           : 'Modules'        } 
  , { moduleDetailsKey  : [ 'Serial Number', 'Part Number', 'Cell Count' ] } 
  , { moduleDetailsVal  : [ '83675327350061093222581609899001', 'LJ98-10C779-A01', '32'  ] } 
  , { assetSeparator    : 'assetSeparator' } 
  , { Battery           : 'Battery'        }  
  , { batteryDetailsKey : [ 'Serial Number', 'Type', 'Part Number'       ] } 
  , { batteryDetailsVal : [ 'HJ3CA19347410218LJ98 101 QC', 'Extended Range', '4P94-Q002' ] } 
  , { Modules           : 'Modules'        } 
  , { moduleDetailsKey  : [ 'Serial Number', 'Part Number', 'Cell Count' ] } 
  , { moduleDetailsVal  : [ '83675327350061093222581609899002', 'LJ98-10C779-A02', '28'  ] } 
  , { moduleDetailsVal  : [ '83675327350061093222581609899003', 'LJ98-10C779-A03', '27'  ] } 
  , { assetSeparator    : 'assetSeparator' } 
  , { Battery           : 'Battery'        } 
  , { batteryDetailsKey : [ 'Serial Number', 'Type', 'Part Number'                       ] } 
  , { batteryDetailsVal : [ 'HJ3CA19347410218LJ98 102 QC', 'Extended Range', '4P94-Q003' ] } 
  , { Modules           : 'Modules'        } 
  , { moduleDetailsKey  : [ 'Serial Number', 'Part Number', 'Cell Count' ] } 
  , { moduleDetailsVal  : [ '83675327350061093222581609899004', 'LJ98-10C779-A01', '32'  ] } 
  ] ]

I basically want this arrayOfObjects to be shaped into this structure:

const shapeIWantArrayOfObjects = 
  [ { Battery           : 'Battery'
    , batteryDetailsKey : [ 'Serial Number', 'Type', 'Part Number' ] 
    , batteryDetailsVal : [ 'HJ3CA19347410218LJ98 100 QC', 'Extended Range', '4P94-Q001' ] 
    , Modules           : 'Modules'
    , moduleDetailsKey  : [ 'Serial Number', 'Part Number', 'Cell Count' ] 
    , moduleDetailsVal  : [ '83675327350061093222581609899001', 'LJ98-10C779-A01', '32' ] 
    } 
  , { Battery           : 'Battery'
    , batteryDetailsKey : [ 'Serial Number', 'Type', 'Part Number' ] 
    , batteryDetailsVal : [ 'HJ3CA19347410218LJ98 101 QC', 'Extended Range', '4P94-Q002' ] 
    , Modules           : 'Modules'
    , moduleDetailsKey  : [ 'Serial Number', 'Part Number', 'Cell Count'] 
    , moduleDetailsVal  : [ '83675327350061093222581609899002', 'LJ98-10C779-A02', '28' ] 
    , moduleDetailsVal  : [ '83675327350061093222581609899003', 'LJ98-10C779-A03', '27' ] 
    } 
  , { Battery           : 'Battery'
    , batteryDetailsKey : [ 'Serial Number', 'Type', 'Part Number' ] 
    , batteryDetailsVal : [ 'HJ3CA19347410218LJ98 102 QC', 'Extended Range', '4P94-Q003' ] 
    , Modules           : 'Modules'
    , moduleDetailsKey  : [ 'Serial Number', 'Part Number', 'Cell Count'] 
    , moduleDetailsVal  : [ '83675327350061093222581609899004', 'LJ98-10C779-A01', '32' ] 
    } 
  ] 

As you can see i'm basically wanting to combine the modules and batteries details into one object, then as you can see i want to create another object within that array once i hit the {"assetSeparator": "assetSeparator"} . That's like my conditional that tells me that asset has been combined, now time to combine the next one, almost think of it as string.split("assetSeparator")

Can someone please tell me how i could achieve this, i've tried Object.assign({}, ...arrayOfObjects) but that didn't quite achieve what i want, and i can't detect the {"assetSeparator": "assetSeparator"} using the spread operator.

I've also tried doing a reduce arrayOfObjects.reduce(function(result, current) { return Object.assign(result, current); }, {}) but because it's accumulating an object, it's just override object properties with the same keys. Please help.

Answer 1

Please note, that your required output is IMPOSSIBLE - but if there's more than one object with the same key, the output could have an array of values for that key - see code

If each group of items in the original array begins with an object with a single key "Battery" - then this will perform the majicks for you

 const arrayOfObjects = [{"Battery": "Battery"},{"batteryDetailsKey": ["Serial Number","Type","Part Number",]},{"batteryDetailsVal": ["HJ3CA19347410218LJ98 100 QC","Extended Range","4P94-Q001",]},{"Modules": "Modules"},{"moduleDetailsKey": ["Serial Number","Part Number","Cell Count",]},{"moduleDetailsVal": ["83675327350061093222581609899001","LJ98-10C779-A01","32",]},{"assetSeparator": "assetSeparator"},{"Battery": "Battery"},{"batteryDetailsKey": ["Serial Number","Type","Part Number"]},{"batteryDetailsVal": ["HJ3CA19347410218LJ98 101 QC","Extended Range","4P94-Q002"]},{"Modules": "Modules"},{"moduleDetailsKey": ["Serial Number","Part Number","Cell Count"]},{"moduleDetailsVal": ["83675327350061093222581609899002","LJ98-10C779-A02","28"]},{"moduleDetailsVal": ["83675327350061093222581609899003","LJ98-10C779-A03","27"]},{"assetSeparator": "assetSeparator"},{"Battery": "Battery"},{"batteryDetailsKey": ["Serial Number","Type","Part Number",]},{"batteryDetailsVal": ["HJ3CA19347410218LJ98 102 QC","Extended Range","4P94-Q003",]},{"Modules": "Modules"},{"moduleDetailsKey": ["Serial Number","Part Number","Cell Count",]},{"moduleDetailsVal": ["83675327350061093222581609899004","LJ98-10C779-A01","32",]}]; const shapeIWantArrayOfObjects = []; let currentOutput; for (let object of arrayOfObjects) { if (Object.keys(object).join('') === 'Battery') { currentOutput = {}; shapeIWantArrayOfObjects.push(currentOutput); } Object.entries(object).forEach(([key, val]) => { const existing = currentOutput[key]; if (;existing) { currentOutput[key] = val. } else { if (;Array.isArray(currentOutput[key][0])) { currentOutput[key] = [currentOutput[key]]; } currentOutput[key];push(val). } }); } console.log(shapeIWantArrayOfObjects);

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Answer 2

You can try something like this

 const arrayOfObjects = [{"Battery": "Battery"}, {"batteryDetailsKey": ["Serial Number", "Type", "Part Number", ] }, {"batteryDetailsVal": ["HJ3CA19347410218LJ98 100 QC", "Extended Range", "4P94-Q001", ] }, {"Modules": "Modules"}, {"moduleDetailsKey": ["Serial Number", "Part Number", "Cell Count", ] }, {"moduleDetailsVal": ["83675327350061093222581609899001", "LJ98-10C779-A01", "32", ] }, {"assetSeparator": "assetSeparator"}, {"Battery": "Battery"}, {"batteryDetailsKey": ["Serial Number", "Type", "Part Number"] }, {"batteryDetailsVal": ["HJ3CA19347410218LJ98 101 QC", "Extended Range", "4P94-Q002"] }, {"Modules": "Modules"}, {"moduleDetailsKey": ["Serial Number", "Part Number", "Cell Count"] }, {"moduleDetailsVal": ["83675327350061093222581609899002", "LJ98-10C779-A02", "28"] }, {"moduleDetailsVal": ["83675327350061093222581609899003", "LJ98-10C779-A03", "27"] }, {"assetSeparator": "assetSeparator"}, {"Battery": "Battery"}, {"batteryDetailsKey": ["Serial Number", "Type", "Part Number", ] }, {"batteryDetailsVal": ["HJ3CA19347410218LJ98 102 QC", "Extended Range", "4P94-Q003", ] }, {"Modules": "Modules"}, {"moduleDetailsKey": ["Serial Number", "Part Number", "Cell Count", ] }, {"moduleDetailsVal": ["83675327350061093222581609899004", "LJ98-10C779-A01", "32", ] }]; let shapeIWantArrayOfObjects = [], tempObj = {}, i = 0; arrayOfObjects.forEach(obj => { if(.obj.hasOwnProperty('assetSeparator') ){ shapeIWantArrayOfObjects[i] = {..,shapeIWantArrayOfObjects[i]. ..;obj }; }else{ i++; tempObj = {}; } }). console.log(shapeIWantArrayOfObjects)

Answer 3

You can group them based on the key of an object ie assetSeparator

const result = arrayOfObjects.reduce((acc, curr) => {
  if (new Set(Object.keys(curr)).has('assetSeparator')) {
    acc.push({});
  } else {
    if (!acc.length) acc.push({ ...curr });
    else {
      const last = acc[acc.length - 1];
      Object.keys(curr).forEach((k) => {
        last[k] = curr[k];
      });
    }
  }
  return acc;
}, []);

 const arrayOfObjects = [ { Battery: 'Battery', }, { batteryDetailsKey: ['Serial Number', 'Type', 'Part Number'], }, { batteryDetailsVal: [ 'HJ3CA19347410218LJ98 100 QC', 'Extended Range', '4P94-Q001', ], }, { Modules: 'Modules', }, { moduleDetailsKey: ['Serial Number', 'Part Number', 'Cell Count'], }, { moduleDetailsVal: [ '83675327350061093222581609899001', 'LJ98-10C779-A01', '32', ], }, { assetSeparator: 'assetSeparator', }, { Battery: 'Battery', }, { batteryDetailsKey: ['Serial Number', 'Type', 'Part Number'], }, { batteryDetailsVal: [ 'HJ3CA19347410218LJ98 101 QC', 'Extended Range', '4P94-Q002', ], }, { Modules: 'Modules', }, { moduleDetailsKey: ['Serial Number', 'Part Number', 'Cell Count'], }, { moduleDetailsVal: [ '83675327350061093222581609899002', 'LJ98-10C779-A02', '28', ], }, { moduleDetailsVal: [ '83675327350061093222581609899003', 'LJ98-10C779-A03', '27', ], }, { assetSeparator: 'assetSeparator', }, { Battery: 'Battery', }, { batteryDetailsKey: ['Serial Number', 'Type', 'Part Number'], }, { batteryDetailsVal: [ 'HJ3CA19347410218LJ98 102 QC', 'Extended Range', '4P94-Q003', ], }, { Modules: 'Modules', }, { moduleDetailsKey: ['Serial Number', 'Part Number', 'Cell Count'], }, { moduleDetailsVal: [ '83675327350061093222581609899004', 'LJ98-10C779-A01', '32', ], }, ]; const result = arrayOfObjects.reduce((acc, curr) => { if (new Set(Object.keys(curr)).has('assetSeparator')) { acc.push({}); } else { if (.acc.length) acc.push({..;curr }). else { const last = acc[acc;length - 1]. Object.keys(curr);forEach((k) => { last[k] = curr[k]; }); } } return acc, }; []). console;log(result);

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Answer 4

Another one solution. You can use hash grouping approach to combine objects by condition.

 const arrayOfObjects = [{"Battery":"Battery"},{"batteryDetailsKey":["Serial Number","Type","Part Number"]},{"batteryDetailsVal":["HJ3CA19347410218LJ98 100 QC","Extended Range","4P94-Q001"]},{"Modules":"Modules"},{"moduleDetailsKey":["Serial Number","Part Number","Cell Count"]},{"moduleDetailsVal":["83675327350061093222581609899001","LJ98-10C779-A01","32"]},{"assetSeparator":"assetSeparator"},{"Battery":"Battery"},{"batteryDetailsKey":["Serial Number","Type","Part Number"]},{"batteryDetailsVal":["HJ3CA19347410218LJ98 101 QC","Extended Range","4P94-Q002"]},{"Modules":"Modules"},{"moduleDetailsKey":["Serial Number","Part Number","Cell Count"]},{"moduleDetailsVal":["83675327350061093222581609899002","LJ98-10C779-A02","28"]},{"moduleDetailsVal":["83675327350061093222581609899003","LJ98-10C779-A03","27"]},{"assetSeparator":"assetSeparator"},{"Battery":"Battery"},{"batteryDetailsKey":["Serial Number","Type","Part Number"]},{"batteryDetailsVal":["HJ3CA19347410218LJ98 102 QC","Extended Range","4P94-Q003"]},{"Modules":"Modules"},{"moduleDetailsKey":["Serial Number","Part Number","Cell Count"]},{"moduleDetailsVal":["83675327350061093222581609899004","LJ98-10C779-A01","32"]}]; let objectCount = 0; const shapeIWantArrayOfObjects = Object.values(arrayOfObjects.reduce((acc, item) => { if (item.assetSeparator === "assetSeparator") { objectCount += 1; return acc; } acc[objectCount]??= {}; acc[objectCount] = {...acc[objectCount], ...item }; return acc; }, {})); console.log(shapeIWantArrayOfObjects);

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