Convert an array into an array of arrays using javascript?

Question

I want to print something on the excel file and that excel file works on the format of array of arrays so I need to convert an array into an array of arrays like this:

['x','y','z'] to [['x'],['y'],['z']]

I have tried to use store this using the firestore and push it on the array

const query = async() => {
  const querySnapshot = await db.collection('collectionName').get();
  const data = []
  querysnapshot.forEach(doc => {
    const x = getIdentifier(doc)
    data.push(x)
  })
  console.log(data) //it gives an array like this ['x','y','z'] 
}
query();

console .log (data .map (x => [x])) should be all you need. — Scott Sauyet
– Scott Sauyet, Commented Mar 18, 2020 at 20:47
Please format your code properly, it makes it a lot easier for others to read. Also, if your question is ['x','y','z'] to [['x'],['y'],['z']] why are you adding information about firebase? — Ruan Mendes
– Ruan Mendes, Commented Mar 18, 2020 at 20:48
Use any of the answers to How to convert simple array into two-dimensional array (matrix) with Javascript and set "number of elements per array" to 1. — Heretic Monkey
– Heretic Monkey, Commented Mar 18, 2020 at 20:52
Also note that you can simplify quite a bit with const data = querysnapshot .map (getIdentifier) (assuming that querysnapshot is simply an array.) — Scott Sauyet
– Scott Sauyet, Commented Mar 18, 2020 at 20:53
@ScottSauyet As true as that is, I prefer to see querysnapshot.map((data) => getIdentifier(data)). — Ruan Mendes
– Ruan Mendes, Commented Mar 18, 2020 at 20:55

ZER0 · Accepted Answer · 2020-03-18 20:49:01Z

1

Just use map:

const array = ['x','y','z'];
const array2 = array.map(value => [value]);

console.log(array2) // [['x'],['y'],['z']]

answered Mar 18, 2020 at 20:49

ZER0

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