How to get data from arrays inside of array

Question

I'm working on an project that uses React with hooks and typescript. I'm currently trying to get data from arrays inside an array that I get from my json response. Data what i log after data handling looks like this:

[
    [
        "2021-09-07",
        43
    ],
    [
        "2021-09-08",
        47
    ],
    [
        "2021-09-09",
        52
    ]
]

So the question is, how can i get the numerical values seen in the json, to an array?

EDIT: Got it working now. Had to add this:

const numbers = data.map((item: any) => item[1]);
  console.log(numbers);

Thanks alot @Ryan Le

Show in more detail in what format you need to receive data

wowandy
– wowandy

2021-09-07 11:17:02 +00:00
Commented Sep 7, 2021 at 11:17 — wowandy
– wowandy, Commented Sep 7, 2021 at 11:17
I just want the data like this: [43, 47, 52]

Roni
– Roni

2021-09-07 11:17:52 +00:00
Commented Sep 7, 2021 at 11:17 — Roni
– Roni, Commented Sep 7, 2021 at 11:17

Ryan Le · Accepted Answer · 2021-09-07 11:23:54Z

1

You would map all the numbers from the original array like so:

type Data = [string, number][];

const data: Data = [
  ["2021-09-07", 43],
  ["2021-09-08", 47],
  ["2021-09-09", 52]
];

const result = data.map(item => item[1]);

console.log(result);

edited Sep 7, 2021 at 11:23

answered Sep 7, 2021 at 11:18

Ryan Le

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3 Comments

Roni Over a year ago

Hey, i tried your solution but im getting this error: Parameter 'item' implicitly has an 'any' type.ts(7006)

Ryan Le Over a year ago

Ah, you are on typescript, I updated my answer

Roni Over a year ago

Yes, unfortunately I am. I got it working now, thanks alot!

Najd Feki · Accepted Answer · 2021-09-07 11:28:17Z

0

If by numerical values you mean the second element of each array such as (43 , 47 , 52) you can simply map to a new array like this

const oldArray = [
  [
      "2021-09-07T08:53:34.4067874+00:00",
      43
  ],
  [
      "2021-09-07T09:53:34.4067881+00:00",
      47
  ],
  [
      "2021-09-07T10:53:34.4067884+00:00",
      52
  ]
]
const newArray = oldArray.map((el)=>
  el[1])
console.log(newArray)

answered Sep 7, 2021 at 11:28

Najd Feki

363 bronze badges

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