Split objects in array, based on the property-CodePudding

I want to duplicate entire objects inside an array, based on the properties inside the object. I need to duplicate the objects, based on the split emails, in nominations.

For example

array = [
{
  id:1,
  name: ravi,
  nominations: [email protected], [email protected]
},
{
   id:2
   name: ramu,
   nominations: [email protected], [email protected]
}
]

Need Output like

Output_array = [
{
  id:1,
  name: ravi,
  nominations: [email protected]
},
{
  id:1,
  name: ravi,
  nominations: [email protected]
},
{
   id:2
   name: ramu,
   nominations: [email protected]
},
{
   id:2
   name: ramu,
   nominations: [email protected]
}
]

CodePudding user response：

The easiest way would be to flatMap over the items, then map over the nominations.

const data = [{
  id:1,
  name: "ravi",
  nominations: "[email protected], [email protected]"
},
{
   id:2,
   name: "ramu",
   nominations: "[email protected], [email protected]"
}];

const result = data.flatMap(item => {
  return item.nominations.split(", ").map(email => ({
    id: item.id,
    name: item.name,
    nomination: email
  }))
})

console.log(result)

CodePudding user response：

A pretty straightforward way using loops:

let data = [
  {
    "id": 1,
    "name": "ravi",
    "nominations": "[email protected],[email protected]"
  },
  {
    "id": 2,
    "name": "ramu",
    "nominations": "[email protected],[email protected]"
  }
];

let newData = []
for (let element of data) {
  let emailIds = element.nominations.split(",");
  if (emailIds.length > 1) {
    for (let emailId of emailIds)
      newData.push({ id: element.id, name: element.name, nominations: emailId })
  }
}

console.log(newData)

Explanation: Starting with traversing the entire objects, in each object you split the nominations string and split it with "," to check if there is more than one email. If it does exist, you run a loop to individually add them.

CodePudding user response：

This could be done with an arguably long one-liner. Object.assign function can be employed to duplicate input object while changing property/properties of interest.

let input = [{
    id: 1,
    name: `ravi`,
    nominations: `[email protected], [email protected]`
},
{
    id: 2,
    name: `ramu`,
    nominations: `[email protected], [email protected]`
}];

let output = input.flatMap(i => i.nominations.split(",").map(n => Object.assign({}, i, { nominations: n.trim() })));

console.log(output);