Creating a new array from an object that has multiple values per key-CodePudding

I currently have an object that looks like:

var account = [
{"Id":"A1",
"item":"123,456,789"}
];

Since the object above has the key item with multiple values separated by ,, I'd like to create a new array with:

[{"Id":"A1",
"item":"123"},
{"Id":"A1",
"item":"456"},
{"Id":"A1",
"item":"789"}
]

I'm not sure if there's a function for this specific type of array split, since the value of the key item is separated by commas.

CodePudding user response：

You could use Array.flatMap() along with String.split() and Array.map() to get the desired result.

const account = [ { "Id":"A1", "item":"123,456,789" } ];

const result = account.flatMap(({ Id, item }) => { 
    return item.split(',').map(item => ({ Id, item }))
});

console.log('Result:', result)

.as-console-wrapper { max-height: 100% !important; }

CodePudding user response：

account.item.split(',') see this it should work

CodePudding user response：

This is a readable response I think.

function format(account) {
  let array = [];
  for (let i = 0; i < account.length; i  ) {
    let item = account[i].item.split(',');
    for (let j = 0; j < item.length; j  ) {
      array.push({ Id: account[i].Id, item: item[j] });
    }
  }
  return array;
}