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convert map into list of objects

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-1

Input:

 "8": [
 "a": 1,
 "b": 2
 ],
 "13": [
 "a": 3,
 "b": 4
 ]

Output

[
 
 "a": 1,
 "b": 2,
 "type": 8
 ,
 
 "a": 3,
 "b": 4,
 "type": 13
 
]

I tried to do nested map but no luck. Please help if any straightforward way to do it.

result = _.map(input, temp => _.map(temp, obj => _.assign(_.pick(obj, ['a', 'b'])))); 

javascript lodash

share|improve this question

edited Mar 26 at 0:45

Jwalin Shah

asked Mar 26 at 0:41

Jwalin ShahJwalin Shah

1,5381212 silver badges1919 bronze badges

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  @JaromandaX lodash map does work on objects
  
  – charlietfl
  Mar 26 at 0:55
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  oh, does it ... my bad
  
  – Jaromanda X
  Mar 26 at 0:56
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  start with Object.values(" your object") see where that goes I guess...
  
  – Jacob
  Mar 26 at 1:01
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  your "attempt" is close, except you didn't even "attempt" to add type at all ... result = _.map(input, (temp, key) => _.map(temp, obj => _.assign(type: +key, _.pick(obj, ['a', 'b']))))
  
  – Jaromanda X
  Mar 26 at 1:02
  

  
  
  
  

add a comment | 

-1

Input:

 "8": [
 "a": 1,
 "b": 2
 ],
 "13": [
 "a": 3,
 "b": 4
 ]

Output

[
 
 "a": 1,
 "b": 2,
 "type": 8
 ,
 
 "a": 3,
 "b": 4,
 "type": 13
 
]

I tried to do nested map but no luck. Please help if any straightforward way to do it.

result = _.map(input, temp => _.map(temp, obj => _.assign(_.pick(obj, ['a', 'b'])))); 

javascript lodash

share|improve this question

edited Mar 26 at 0:45

Jwalin Shah

asked Mar 26 at 0:41

Jwalin ShahJwalin Shah

1,5381212 silver badges1919 bronze badges

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  @JaromandaX lodash map does work on objects
  
  – charlietfl
  Mar 26 at 0:55
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  oh, does it ... my bad
  
  – Jaromanda X
  Mar 26 at 0:56
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  start with Object.values(" your object") see where that goes I guess...
  
  – Jacob
  Mar 26 at 1:01
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  your "attempt" is close, except you didn't even "attempt" to add type at all ... result = _.map(input, (temp, key) => _.map(temp, obj => _.assign(type: +key, _.pick(obj, ['a', 'b']))))
  
  – Jaromanda X
  Mar 26 at 1:02
  

  
  
  
  

add a comment | 

Input:

 "8": [
 "a": 1,
 "b": 2
 ],
 "13": [
 "a": 3,
 "b": 4
 ]

Output

[
 
 "a": 1,
 "b": 2,
 "type": 8
 ,
 
 "a": 3,
 "b": 4,
 "type": 13
 
]

I tried to do nested map but no luck. Please help if any straightforward way to do it.

result = _.map(input, temp => _.map(temp, obj => _.assign(_.pick(obj, ['a', 'b'])))); 

javascript lodash

share|improve this question

edited Mar 26 at 0:45

Jwalin Shah

asked Mar 26 at 0:41

Jwalin ShahJwalin Shah

1,5381212 silver badges1919 bronze badges

 "8": [
 "a": 1,
 "b": 2
 ],
 "13": [
 "a": 3,
 "b": 4
 ]

[
 
 "a": 1,
 "b": 2,
 "type": 8
 ,
 
 "a": 3,
 "b": 4,
 "type": 13
 
]

result = _.map(input, temp => _.map(temp, obj => _.assign(_.pick(obj, ['a', 'b'])))); 

share|improve this question

edited Mar 26 at 0:45

Jwalin Shah

asked Mar 26 at 0:41

Jwalin ShahJwalin Shah

1,5381212 silver badges1919 bronze badges

share|improve this question

edited Mar 26 at 0:45

Jwalin Shah

asked Mar 26 at 0:41

Jwalin ShahJwalin Shah

1,5381212 silver badges1919 bronze badges

asked Mar 26 at 0:41

Jwalin ShahJwalin Shah

1,5381212 silver badges1919 bronze badges

asked Mar 26 at 0:41

Jwalin ShahJwalin Shah

1,5381212 silver badges1919 bronze badges

2 Answers
2

active

oldest

votes

2

Here's a technique that should work:

const transform = (input) => Object.entries(input)
 .map(([key, val]) => val.map(v => (...v, type: key)))
 .flat()

const input = "13": ["a": 3, "b": 4], "8": ["a": 1, "b": 2]

console.log(transform(input))

As pointed out in another answer, if your target environments don't support flat, you can replace this:

 .flat()

with this:

 .reduce((a, b) => a.concat(b), [])

share|improve this answer

answered Mar 26 at 0:51

Scott SauyetScott Sauyet

23.7k22 gold badges2727 silver badges6161 bronze badges

add a comment | 

1

You can use _.flatMap() to iterate the object, and flatten the results. Inside the flatMap iterate the values with _.map(), and use _.assign() to combine the original object and the type:

const input = 
 "8": [
 "a": 1,
 "b": 2
 ],
 "13": [
 "a": 3,
 "b": 4
 ]


const result = _.flatMap(input, // iterate the object and flatten the results
 (values, type) => _.map( // iterate the arrays
 values, v => _.assign( type , v) // combine the type with the object
 )
)

console.log(result)

<script src="https://cdnjs.cloudflare.com/ajax/libs/lodash.js/4.17.11/lodash.min.js"></script>

share|improve this answer

edited Mar 26 at 15:06

answered Mar 26 at 6:03

Ori DroriOri Drori

89.4k1515 gold badges9999 silver badges105105 bronze badges

add a comment | 

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2

Here's a technique that should work:

const transform = (input) => Object.entries(input)
 .map(([key, val]) => val.map(v => (...v, type: key)))
 .flat()

const input = "13": ["a": 3, "b": 4], "8": ["a": 1, "b": 2]

console.log(transform(input))

As pointed out in another answer, if your target environments don't support flat, you can replace this:

 .flat()

with this:

 .reduce((a, b) => a.concat(b), [])

share|improve this answer

answered Mar 26 at 0:51

Scott SauyetScott Sauyet

23.7k22 gold badges2727 silver badges6161 bronze badges

add a comment | 

2

Here's a technique that should work:

const transform = (input) => Object.entries(input)
 .map(([key, val]) => val.map(v => (...v, type: key)))
 .flat()

const input = "13": ["a": 3, "b": 4], "8": ["a": 1, "b": 2]

console.log(transform(input))

As pointed out in another answer, if your target environments don't support flat, you can replace this:

 .flat()

with this:

 .reduce((a, b) => a.concat(b), [])

share|improve this answer

answered Mar 26 at 0:51

Scott SauyetScott Sauyet

23.7k22 gold badges2727 silver badges6161 bronze badges

add a comment | 

Here's a technique that should work:

const transform = (input) => Object.entries(input)
 .map(([key, val]) => val.map(v => (...v, type: key)))
 .flat()

const input = "13": ["a": 3, "b": 4], "8": ["a": 1, "b": 2]

console.log(transform(input))

As pointed out in another answer, if your target environments don't support flat, you can replace this:

 .flat()

with this:

 .reduce((a, b) => a.concat(b), [])

share|improve this answer

answered Mar 26 at 0:51

Scott SauyetScott Sauyet

23.7k22 gold badges2727 silver badges6161 bronze badges

const transform = (input) => Object.entries(input)
 .map(([key, val]) => val.map(v => (...v, type: key)))
 .flat()

const input = "13": ["a": 3, "b": 4], "8": ["a": 1, "b": 2]

console.log(transform(input))

 .flat()

 .reduce((a, b) => a.concat(b), [])

const transform = (input) => Object.entries(input)
 .map(([key, val]) => val.map(v => (...v, type: key)))
 .flat()

const input = "13": ["a": 3, "b": 4], "8": ["a": 1, "b": 2]

console.log(transform(input))

const transform = (input) => Object.entries(input)
 .map(([key, val]) => val.map(v => (...v, type: key)))
 .flat()

const input = "13": ["a": 3, "b": 4], "8": ["a": 1, "b": 2]

console.log(transform(input))

share|improve this answer

answered Mar 26 at 0:51

Scott SauyetScott Sauyet

23.7k22 gold badges2727 silver badges6161 bronze badges

answered Mar 26 at 0:51

Scott SauyetScott Sauyet

23.7k22 gold badges2727 silver badges6161 bronze badges

answered Mar 26 at 0:51

Scott SauyetScott Sauyet

23.7k22 gold badges2727 silver badges6161 bronze badges

1

You can use _.flatMap() to iterate the object, and flatten the results. Inside the flatMap iterate the values with _.map(), and use _.assign() to combine the original object and the type:

const input = 
 "8": [
 "a": 1,
 "b": 2
 ],
 "13": [
 "a": 3,
 "b": 4
 ]


const result = _.flatMap(input, // iterate the object and flatten the results
 (values, type) => _.map( // iterate the arrays
 values, v => _.assign( type , v) // combine the type with the object
 )
)

console.log(result)

<script src="https://cdnjs.cloudflare.com/ajax/libs/lodash.js/4.17.11/lodash.min.js"></script>

share|improve this answer

edited Mar 26 at 15:06

answered Mar 26 at 6:03

Ori DroriOri Drori

89.4k1515 gold badges9999 silver badges105105 bronze badges

add a comment | 

1

You can use _.flatMap() to iterate the object, and flatten the results. Inside the flatMap iterate the values with _.map(), and use _.assign() to combine the original object and the type:

const input = 
 "8": [
 "a": 1,
 "b": 2
 ],
 "13": [
 "a": 3,
 "b": 4
 ]


const result = _.flatMap(input, // iterate the object and flatten the results
 (values, type) => _.map( // iterate the arrays
 values, v => _.assign( type , v) // combine the type with the object
 )
)

console.log(result)

<script src="https://cdnjs.cloudflare.com/ajax/libs/lodash.js/4.17.11/lodash.min.js"></script>

share|improve this answer

edited Mar 26 at 15:06

answered Mar 26 at 6:03

Ori DroriOri Drori

89.4k1515 gold badges9999 silver badges105105 bronze badges

add a comment | 

You can use _.flatMap() to iterate the object, and flatten the results. Inside the flatMap iterate the values with _.map(), and use _.assign() to combine the original object and the type:

const input = 
 "8": [
 "a": 1,
 "b": 2
 ],
 "13": [
 "a": 3,
 "b": 4
 ]


const result = _.flatMap(input, // iterate the object and flatten the results
 (values, type) => _.map( // iterate the arrays
 values, v => _.assign( type , v) // combine the type with the object
 )
)

console.log(result)

<script src="https://cdnjs.cloudflare.com/ajax/libs/lodash.js/4.17.11/lodash.min.js"></script>

share|improve this answer

edited Mar 26 at 15:06

answered Mar 26 at 6:03

Ori DroriOri Drori

89.4k1515 gold badges9999 silver badges105105 bronze badges

const input = 
 "8": [
 "a": 1,
 "b": 2
 ],
 "13": [
 "a": 3,
 "b": 4
 ]


const result = _.flatMap(input, // iterate the object and flatten the results
 (values, type) => _.map( // iterate the arrays
 values, v => _.assign( type , v) // combine the type with the object
 )
)

console.log(result)

<script src="https://cdnjs.cloudflare.com/ajax/libs/lodash.js/4.17.11/lodash.min.js"></script>

const input = 
 "8": [
 "a": 1,
 "b": 2
 ],
 "13": [
 "a": 3,
 "b": 4
 ]


const result = _.flatMap(input, // iterate the object and flatten the results
 (values, type) => _.map( // iterate the arrays
 values, v => _.assign( type , v) // combine the type with the object
 )
)

console.log(result)

<script src="https://cdnjs.cloudflare.com/ajax/libs/lodash.js/4.17.11/lodash.min.js"></script>

const input = 
 "8": [
 "a": 1,
 "b": 2
 ],
 "13": [
 "a": 3,
 "b": 4
 ]


const result = _.flatMap(input, // iterate the object and flatten the results
 (values, type) => _.map( // iterate the arrays
 values, v => _.assign( type , v) // combine the type with the object
 )
)

console.log(result)

<script src="https://cdnjs.cloudflare.com/ajax/libs/lodash.js/4.17.11/lodash.min.js"></script>

share|improve this answer

edited Mar 26 at 15:06

answered Mar 26 at 6:03

Ori DroriOri Drori

89.4k1515 gold badges9999 silver badges105105 bronze badges

answered Mar 26 at 6:03

Ori DroriOri Drori

89.4k1515 gold badges9999 silver badges105105 bronze badges

answered Mar 26 at 6:03

Ori DroriOri Drori

89.4k1515 gold badges9999 silver badges105105 bronze badges