The task of mapping an array of objects with nested values using JavaScript is proving to

Question

The task of mapping an array of objects with nested values using JavaScript is proving to

Attempting to convert an array of objects with nested values in child objects like:

const objs = [{
        "B": {
            "value": 1,
        },
        "D": {
            "value": "45"
        },
        "E": {
            "value": "234"
        },
        "A": {
            "value": "543"
        },
        "C": {
            "value": "250"
        }
    },...]

into a new structure as shown below:

[
  { name: 'B', value: 1 }, 
  { name: 'D', value: '45' }, 
  { name: 'E', value: '234' }, 
  { name: 'A', value: '543' },
  { name: 'C', value: '250' }
]

however, the result of the mapping is undefined

const mapped = objs.map((key, index) => {
  Object.keys(key).map(el => ({
    name: el
  }))
})

For more details and examples, check out this Stackblitz link

javascript arrays typescript mapping javascript-objects

Answer 1

Answer №1

Please don't forget to include the return statement and define the value property.

Additionally, you might consider using flatMap over map to prevent a nested array in the output:

const objs = [{
    "B": {
        "value": 1,
    },
    "D": {
        "value": "45"
    },
    "E": {
        "value": "234"
    },
    "A": {
        "value": "543"
    },
    "C": {
        "value": "250"
    }
}]

const mapped = objs.flatMap((key, index) => {
    return Object.keys(key).map(el => ({
        name: el,
        value: key[el].value
    }))
})

console.log(mapped)

Answer 2

Please don't forget to include the return statement and define the value property.

Additionally, you might consider using flatMap over map to prevent a nested array in the output:

const objs = [{
    "B": {
        "value": 1,
    },
    "D": {
        "value": "45"
    },
    "E": {
        "value": "234"
    },
    "A": {
        "value": "543"
    },
    "C": {
        "value": "250"
    }
}]

const mapped = objs.flatMap((key, index) => {
    return Object.keys(key).map(el => ({
        name: el,
        value: key[el].value
    }))
})

console.log(mapped)

Answer 3

Answer №2

Working with objs[0] is recommended over working with objs, as the former represents an array containing a single object rather than multiple objects.

let newArray = []
for(let key in objs[0]){
newArray.push({
"name": key,
"value": objs[0][key].value
})
}

Answer 4

Working with objs[0] is recommended over working with objs, as the former represents an array containing a single object rather than multiple objects.

let newArray = []
for(let key in objs[0]){
newArray.push({
"name": key,
"value": objs[0][key].value
})
}

Answer 5

Answer №3

The code is missing a return statement in the Object.keys method. Instead of using Object.keys, consider using Object.entries to access both the key and value.

const objs = [{
  "B": {
    "value": 1,
  },
  "D": {
    "value": "45"
  },
  "E": {
    "value": "234"
  },
  "A": {
    "value": "543"
  },
  "C": {
    "value": "250"
  }
}];
const mapped = objs.map((key, _) => {
  return Object.entries(key).map(([name, {
    value
  }]) => ({
    name,
    value
  }))
}).flat();

console.log(mapped);

Answer 6

The code is missing a return statement in the Object.keys method. Instead of using Object.keys, consider using Object.entries to access both the key and value.

const objs = [{
  "B": {
    "value": 1,
  },
  "D": {
    "value": "45"
  },
  "E": {
    "value": "234"
  },
  "A": {
    "value": "543"
  },
  "C": {
    "value": "250"
  }
}];
const mapped = objs.map((key, _) => {
  return Object.entries(key).map(([name, {
    value
  }]) => ({
    name,
    value
  }))
}).flat();

console.log(mapped);

The task of mapping an array of objects with nested values using JavaScript is proving to

Answer №1

Answer №2

Answer №3

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