Agfdhyk

const data = [{ name: 'John', score: 90, time: 'evening' }, { name: 'Doni', score: 68, time: 'morning' }, { name: 'Jiu', score: 50, time: 'evening' }, { name: 'Shin', score: 92, time: 'morning' }, ];



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

const grpV = (d, rng) => d.reduce((r,{name, score}) => {

  let key = score > rng ? 'pass' : 'fail'

  r[key] = [...r[key] || , {name, score}]

  return r

}, {})



const r = Object.entries(grp(data, 'time')).map(([k,v]) => ({[k]: grpV(v, 75)}))



console.log(r)

const data = [{ name: 'John', score: 90, time: 'evening' }, { name: 'Doni', score: 68, time: 'morning' }, { name: 'Jiu', score: 50, time: 'evening' }, { name: 'Shin', score: 92, time: 'morning' }, ];



const partition = (x, p) => _(x)

  .partition(y => y.score > p)

  .map((x,i) => ({ [i==0 ? 'pass': 'fail']: _.omit(x[0], 'time')}))

  .value()



const r = _(data)

  .groupBy('time')

  .mapValues(x => partition(x, 75))

  .value()



console.log(r)

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

let students = [{name: 'John',score: 90,time: 'evening'},{name: 'Doni',score: 68,time: 'morning'},{name: 'Jiu',score: 50,time: 'evening'},{name: 'Shin',score: 92,time: 'morning'},];



// Empty case

let base =  {

        "evening": {"pass": , "fail": },

        "morning": {"pass": , "fail": }

}



const PASSING = 70



students.forEach(({name, score, time}) => {

    let key = score >= PASSING ? 'pass' : 'fail'

    base[time][key].push({name, score})

})

console.log(base)

let students = [{name: 'Mark',score: 95,time: 'afternoon'}, {name: 'John',score: 90,time: 'evening'},{name: 'Doni',score: 68,time: 'morning'},{name: 'Jiu',score: 50,time: 'evening'},{name: 'Shin',score: 92,time: 'morning'},];



const PASSING = 70



let result = students.reduce((obj, {name, score, time}) => {

    if (!obj[time]) obj[time] = {'pass': , 'fail':  }



    let key = score >= PASSING ? 'pass' : 'fail'

    obj[time][key].push({name, score})



    return obj

}, {})





console.log(result)

const data =   [

      {name: 'John',score: 90, time: 'evening'},

      {name: 'Doni',score: 68, time: 'morning'},

      {name: 'Jiu',score: 50, time: 'evening'},

      {name: 'Shin',score: 92, time: 'morning'},

      {name: 'Fubar',score: 75, time: 'noon'},

    ];

    

    

function formatData(data){

   const passingScore = 75;

   const output = {};



   data.forEach(function(item){

      if(!output[item.time]) output[item.time] = {pass: , fail: };



      const stud = { name: item.name, score: item.score };

        

      if(item.score >= passingScore) output[item.time]['pass'].push(stud)

      else output[item.time]['fail'].push(stud)  

   });



   return output;

}



console.log(formatData(data));