Create an array of value contained in objects in an array in Javascript

Asked Jul 31 '20 at 10:14

Active Jul 31 '20 at 10:14

Viewed 22 times

I have an array of objects and I'd like to select it to have an array of only objects values My array:

  favorites: [{ idSave: '10000', isChecked: true },
  { idSave: '10001', isChecked: true },
  { idSave: '18807', isChecked: true }]

The expected output:

['10000','10001','18807']

My code:

let favorites = req.user.favorites
        favorites.forEach((arrayItem) => {
            let idSaveMain = arrayItem.idSave
            let idSaveArr = [ idSaveMain]
            console.log(idSaveArr)
        })

The actual output:

['10000']
['10001']
['18807']

asked Jul 31 '20 at 10:14

lf_celine

`[ idSaveMain]` is creating a new array. You want to only create it once and then add to it. Create it outside the loop and use `push` to add to it. – Tim Büthe Jul 31 '20 at 10:16
`Array.prototype.map()` is all you need. – Andreas Jul 31 '20 at 10:17
`const out = req.user.favorites.map(({idSave}) => idSave);` – Yoshi Jul 31 '20 at 10:17

Create an array of value contained in objects in an array in Javascript

0 Answers0