Transform object into an array by flattening it

Question

Transform object into an array by flattening it

I'm currently working on a task where I have an object that needs to be transformed into an array with the property as the key. The structure of the object is as follows:

{
 Cat: {
   value: 50
 },
 Dog: {
   value: 80
 }
}

The desired output should look like this:

[
 {
    animal: 'Cat',
    value: 50
 },
 {
    animal: 'Dog',
    value: 80
 }
]

If anyone can provide assistance, it would be greatly appreciated.

So far, I've attempted:

 const animalArr = Object.entries(AnimalObj);

However, I am unsure about what steps to take next.

javascript arrays object ecmascript-6

Answer 1

Answer №1

const AnimalObj = {
  Cat: {
    value: 50
  },
  Dog: {
    value: 80
  }
};

const result = Object.entries(AnimalObj)
  .map(([animal, { value }]) => ({ animal, value }));

console.log(result);

Loop through all the elements within AnimalObj using Object.entries and create a new object for each entry using map.

The part involving the map function in this answer may appear complex.

([animal, { value }]) => ({ animal, value })

This actually consists of two parts:

Destructuring of arguments

When using Object.entries, we receive an array containing keys and their corresponding values as arrays. For example,
```
console.log(Object.entries(AnimalObj))
```
would output
```
[ [ 'Cat', { value: 50 } ], [ 'Dog', { value: 80 } ] ]
```
We then take each individual array passed to map and use [animal, { value }] to extract the first string into the variable animal, while destructuring the second element (an object) to retrieve only the value.
Creation of objects

With all the necessary pieces obtained - animal and value, we utilize shorthand notation to form objects with { animal, value }. This results in an object with keys animal and value, each holding the corresponding variable's value.

Answer 2

const AnimalObj = {
  Cat: {
    value: 50
  },
  Dog: {
    value: 80
  }
};

const result = Object.entries(AnimalObj)
  .map(([animal, { value }]) => ({ animal, value }));

console.log(result);

Loop through all the elements within AnimalObj using Object.entries and create a new object for each entry using map.

The part involving the map function in this answer may appear complex.

([animal, { value }]) => ({ animal, value })

This actually consists of two parts:

Destructuring of arguments

When using Object.entries, we receive an array containing keys and their corresponding values as arrays. For example,
```
console.log(Object.entries(AnimalObj))
```
would output
```
[ [ 'Cat', { value: 50 } ], [ 'Dog', { value: 80 } ] ]
```
We then take each individual array passed to map and use [animal, { value }] to extract the first string into the variable animal, while destructuring the second element (an object) to retrieve only the value.
Creation of objects

With all the necessary pieces obtained - animal and value, we utilize shorthand notation to form objects with { animal, value }. This results in an object with keys animal and value, each holding the corresponding variable's value.

Answer 3

Answer №2

const animals = {
 Tiger: {
   count: 70
 },
 Lion: {
   count: 90
 }
};

const result = Object.entries(animals).map(([type, info]) => {
  return {
    species: type,
    ...info
  };
});

console.log(result);

Answer 4

const animals = {
 Tiger: {
   count: 70
 },
 Lion: {
   count: 90
 }
};

const result = Object.entries(animals).map(([type, info]) => {
  return {
    species: type,
    ...info
  };
});

console.log(result);

Answer 5

Answer №3

If you need to transform an object into an array of key-value pairs, you can use the Object.entries method along with the map function to achieve the desired output.

const 
  dataObj = { Cat: { value: 50 }, Dog: { value: 80 } },
  dataArr = Object.entries(dataObj).map(([animal, { value }]) => ({ animal, value }));

console.log(dataArr);

Answer 6

If you need to transform an object into an array of key-value pairs, you can use the Object.entries method along with the map function to achieve the desired output.

const 
  dataObj = { Cat: { value: 50 }, Dog: { value: 80 } },
  dataArr = Object.entries(dataObj).map(([animal, { value }]) => ({ animal, value }));

console.log(dataArr);

Answer 7

Answer №4

To start, utilize the Object.entries() method to transform the key-value pairs within the object into an array. Afterwards, employ destructuring with the Array#map method in the following manner:

const data = { Apple: {quantity: 10 },Banana: { quantity: 20 } };

const result = Object.entries( data )
.map(([item, details]) => ({item, ...details}));

console.log( result );

Answer 8

To start, utilize the Object.entries() method to transform the key-value pairs within the object into an array. Afterwards, employ destructuring with the Array#map method in the following manner:

const data = { Apple: {quantity: 10 },Banana: { quantity: 20 } };

const result = Object.entries( data )
.map(([item, details]) => ({item, ...details}));

console.log( result );

Answer 9

Answer №5

There's no need for an extra flattening step - you can simply map it directly like this:

AnimalObject = {
 Lion: {
   count: 30
 },
 Tiger: {
   count: 60
 }
} 


 const animalList = Object.entries(AnimalObject).map(([ name, info ]) => ({ animalType: name, count: info.count }));
 console.log(animalList)

Answer 10

There's no need for an extra flattening step - you can simply map it directly like this:

AnimalObject = {
 Lion: {
   count: 30
 },
 Tiger: {
   count: 60
 }
} 


 const animalList = Object.entries(AnimalObject).map(([ name, info ]) => ({ animalType: name, count: info.count }));
 console.log(animalList)

Transform object into an array by flattening it

Answer №1

Answer №2

Answer №3

Answer №4

Answer №5

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