Javascript make calculations and filter list

May 26, 2022

I have below array –

const data=[
{
  month:"nov",
  veryLate:3,
  Late:5,
  onTime:2
},
{
  month:"dec",
  veryLate:1,
  Late:3,
  onTime:16
},
{
  month:"jan",
  veryLate:28,
  Late:1,
  onTime:1
},
}

I want to filter and make calculations on this array such that percentage can be obtained.

Eg. veryLate + Late+ onTime = (3+5+2) = 10

So percentage wise it is –

const data= [
{
  month:"nov",
  veryLate:30,
  Late:50,
  onTime:20
},
{
  month:"dec",
  veryLate:5,
  Late:15,
  onTime:80
},
,
{
  month:"jan",
  veryLate:98.33,
  Late:3.33,
  onTime:3.33
},]

To calculate this I had performed below , but getting syntax error over brackets –

var filteredData=data.map(x=>{
  x.month,
  x.veryLate/(x.veryLate+x.Late+x.onTime)*100,
  x.Late/(x.veryLate+x.Late+x.onTime)*100,
  x.onTime/(x.veryLate+x.Late+x.onTime)*100,
});

How can I obtained calculated results?

>Solution :

x.veryLate wont work in x it should be veryLate itself same for the others

const data=[
{
  month:"nov",
  veryLate:3,
  Late:5,
  onTime:2
},
{
  month:"dec",
  veryLate:1,
  Late:3,
  onTime:16
},
{
  month:"jan",
  veryLate:28,
  Late:1,
  onTime:1
},
]

var filteredData= data.map(x => (
   {
    ...x, 
    veryLate:  x.veryLate/(x.veryLate+x.Late+x.onTime)*100,         
    Late: x.Late/(x.veryLate+x.Late+x.onTime)*100, 
    onTime: x.onTime/(x.veryLate+x.Late+x.onTime)*100
  })
)

console.log(filteredData)

You also must wrap the returning object literal into parentheses. Currently the curly braces is being denoted as the function body.