so i have an array of object like this:

const data =[{
    "username": "MT220047",
    "title": "Test",
    "position": "Management Trainee",
    "department": "Logistic",
    "2022-11-15": 1,
    "2022-11-16": 2
  },
  {
    "username": "MT220047",
    "title": "UntitledForm1",
    "position": "Management Trainee",
    "department": "Logistic",
    "2022-11-16": 1
  },
  {
    "username": "17000691",
    "title": "Test",
    "position": "Foreman",
    "department": "Production",
    "2022-11-16": 1,
    
  }
]

const date =["2022-11-11","2022-11-12","2022-11-13","2022-11-14","2022-11-15","2022-11-16"]

const accumulator = {}
const final =[]
const res = date.map((tanggal)=>{ return data.reduce((a,e)=>(a[e.tanggal]={...(a[e.tanggal] || {}), ...e}, a),{});})
       
console.log(res)

it try to get the summary or pivot value of the dates, but i get this result instead of what i expected:

[ { undefined:
     { username: '17000691',
       title: 'Test',
       position: 'Foreman',
       department: 'Production',
       '2022-11-15': 1,
       '2022-11-16': 1 } },
  { undefined:
     { username: '17000691',
       title: 'Test',
       position: 'Foreman',
       department: 'Production',
       '2022-11-15': 1,
       '2022-11-16': 1 } },
  { undefined:
     { username: '17000691',
       title: 'Test',
       position: 'Foreman',
       department: 'Production',
       '2022-11-15': 1,
       '2022-11-16': 1 } },
 ....]

my expected result should be like this: i try to get the summary total of the dates base on the date array...

 summary_date:[ {"2022-11-15": 1},{"2022-11-16": 4}]

or is it possible to get this result:

data = [{"date":"2022-11-16","total":4},{"date":"2022-11-15","total":1}]

any help on this, or can someone tellme where did i do wrong here?

CodePudding user response：

A combination of an outer .reduce() over the data array with an inner .foreach() over all the dates should do it:

const data =[{
"username": "MT220047",
"title": "Test",
"position": "Management Trainee",
"department": "Logistic",
"2022-11-15": 1,
"2022-11-16": 2
  },
  {
"username": "MT220047",
"title": "UntitledForm1",
"position": "Management Trainee",
"department": "Logistic",
"2022-11-16": 1
  },
  {
"username": "17000691",
"title": "Test",
"position": "Foreman",
"department": "Production",
"2022-11-16": 1,

  }
]

const dates =["2022-11-11","2022-11-12","2022-11-13","2022-11-14","2022-11-15","2022-11-16"]

const res=data.reduce((ac,c)=>{
 const a=(ac[c.title]??={});
 dates.forEach(d=>{if(c[d]) a[d]=(a[d]??0) c[d]});
 return ac;
}, {});

console.log(res);

// convert res into an array of objects resa:
const resa=Object.entries(res).reduce((a,[k,v])=>
 [...a,{title:k},...Object.entries(v).map(([k,v])=>({[k]:v}))], []);
console.log(resa);

The .forEach() callback function

d=>{if(c[d]) a[d]=(a[d]??0) c[d]}

does the following:

1. For each date d it checks whether the current data element c has a property d
2. if so, the element a[d] of the accumulator object a is checked for existence and, if necessary, initialised to 0
3. the value of c[d] is then added to a[d]

Yet another update to the updated question:

const data =[{
"username": "MT220047",
"title": "Test",
"position": "Management Trainee",
"department": "Logistic",
"2022-11-15": 1,
"2022-11-16": 2
  },
  {
"username": "MT220047",
"title": "UntitledForm1",
"position": "Management Trainee",
"department": "Logistic",
"2022-11-16": 1
  },
  {
"username": "17000691",
"title": "Test",
"position": "Foreman",
"department": "Production",
"2022-11-16": 1,

  }
]

const dates =["2022-11-11","2022-11-12","2022-11-13","2022-11-14","2022-11-15","2022-11-16"]

const res=Object.entries(data.reduce((a,c)=>{
 dates.forEach(d=>{if(c[d]) a[d]=(a[d]??0) c[d]});
 return a;
}, {})).map(([date,total])=>({date,total}));

console.log(res);

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