How to split an array of object with 5 properties to a 2 dimensional array

Question

The below is my data that I get from an API and I want to group it as time in one index and the other values in another index. Is that possible to split this? I want the array to be in the format as the values in a second array format

Api data

0: (5) [1577080200000, 157.5599, 157.4902, 157.495, 78330]
1: (5) [1577080500000, 157.54, 157.485, 157.5128, 118202]
2: (5) [1577080800000, 157.54, 157.47, 157.48, 130805]

Expected Output

[1577080200000][157.5599, 157.4902, 157.495, 78330]
[1577080500000][157.54, 157.485, 157.5128, 118202]
[1577080800000][157.54, 157.47, 157.48, 130805]

Nina Scholz · Accepted Answer · 2019-12-25 11:19:56Z

2

You could destructure the array and take the first element and the rest for mapping.

var data = [[1577080200000, 157.5599, 157.4902, 157.495, 78330], [1577080500000, 157.54, 157.485, 157.5128, 118202], [1577080800000, 157.54, 157.47, 157.48, 130805]],
    result = data.map(([first, ...rest]) => [[first], rest]);

console.log(result);

.as-console-wrapper { max-height: 100% !important; top: 0; }

answered Dec 25, 2019 at 11:19

Nina Scholz

388k26 gold badges367 silver badges417 bronze badges

Sign up to request clarification or add additional context in comments.

Comments

EugenSunic · Accepted Answer · 2019-12-26 07:37:24Z

2

I don't see why would you need one element (first element of the arrays) inside the array.

If you really want 2 separate arrays, one for the first element and one for the rest then just add an extra array wrapper around [x[0]]

const arr = [
  [1577080200000, 157.5599, 157.4902, 157.495, 78330],
  [1577080500000, 157.54, 157.485, 157.5128, 118202],
  [1577080800000, 157.54, 157.47, 157.48, 130805],
]

const newArr = arr.map(x => [x[0],[...x.filter((y, i) => i !== 0)]
]);
console.log(newArr);

edited Dec 26, 2019 at 7:37

answered Dec 25, 2019 at 11:07

EugenSunic

13.8k15 gold badges68 silver badges96 bronze badges

Comments

cccn · Accepted Answer · 2019-12-25 11:06:05Z

0

You could use splice:

const arr = [1577080200000, 157.5599, 157.4902, 157.495, 78330]
const traverseArr = [arr.splice(0,1),arr]

console.log(traverseArr)

answered Dec 25, 2019 at 11:06

cccn

9491 gold badge8 silver badges20 bronze badges

1 Comment

Nina Scholz Over a year ago

you are mutating the data.

Arman Taherian · Accepted Answer · 2019-12-25 11:15:26Z

0

Your results array that you mentioned is not a 2 dimensional array, the correct format of 2-dim array is:

[[1577080800000], [157.54, 157.47, 157.48, 130805]]

However, you can get your expected result in a two-dimensional array with the following code:

function splitArray(arr: any[]) {
    const first = arr.slice(0, 1);
    const tail = arr.slice(1);
    return [first, tail];
}

and then call the function like this:

splitArray([1577080200000, 157.5599, 157.4902, 157.495, 78330]);

answered Dec 25, 2019 at 11:15

Arman Taherian

1,1021 gold badge8 silver badges17 bronze badges

Comments

StepUp · Accepted Answer · 2019-12-25 11:57:32Z

0

You can use flatMap method to flat array which will be created by the function:

const result = arr.flatMap(([a, b, c, d])=> [[a], [b, c, d]]);

An example:

const arr = [
  [1577080200000, 157.5599, 157.4902, 157.495, 78330],
  [1577080500000, 157.54, 157.485, 157.5128, 118202],
  [1577080800000, 157.54, 157.47, 157.48, 130805],
]

const result = arr.flatMap(([a, b, c, d])=> [[a], [b, c, d]]);
console.log(result);

edited Dec 25, 2019 at 11:57

answered Dec 25, 2019 at 11:14

StepUp

38.5k16 gold badges95 silver badges159 bronze badges

Collectives™ on Stack Overflow

How to split an array of object with 5 properties to a 2 dimensional array

5 Answers 5

Comments

Comments

1 Comment

Comments

Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

5 Answers 5

Comments

Comments

1 Comment

Comments

Comments

Your Answer

Sign up or log in

Post as a guest

Related