How can I efficiently retrieve the values of a object array if I am unaware of the keys associated with them?

Question

How can I efficiently retrieve the values of a object array if I am unaware of the keys associated with them?

Looking at the array provided below, I am trying to extract every property from it:

let arr = [{'John': 0}, {'Doe': 50}, {'Marry': 100}]

Is there a way to retrieve each key/value pair without prior knowledge of them? I attempted using object.keys, but it returned the array indexes instead.

javascript vue.js

Answer 1

Answer №1

This code snippet is functional

const array = [{'John': 0}, {'Doe': 50}, {'Marry': 100}];


// iterate through each element in the array
array.forEach(item => {
    // nested iteration for each key in the object
    Object.keys(item).forEach(key => {
      // output the value associated with the key
      console.log(key + ' : ' + item[key]);
  })
})

Answer 2

This code snippet is functional

const array = [{'John': 0}, {'Doe': 50}, {'Marry': 100}];


// iterate through each element in the array
array.forEach(item => {
    // nested iteration for each key in the object
    Object.keys(item).forEach(key => {
      // output the value associated with the key
      console.log(key + ' : ' + item[key]);
  })
})

Answer 3

Answer №2

1) Utilize flatMap and Object.keys to extract keys from an array containing objects.

let arr = [{ John: 0 }, { Doe: 50 }, { Marry: 100 }];

const result = arr.flatMap((o) => Object.keys(o));
console.log(result);

2) Retrieve all the values from an array

let arr = [{ John: 0 }, { Doe: 50 }, { Marry: 100 }];

const values = arr.flatMap((o) => Object.values(o));
console.log(values);

3) If you wish to uncover all the keys and values in an object

let arr = [{ John: 0 }, { Doe: 50 }, { Marry: 100 }];

const result = {
  keys: [],
  values: [],
};

for (let obj of arr) {
  Object.entries(obj).map(([k, v]) => {
    result.keys.push(k);
    result.values.push(v);
  });
}

console.log(result);

Answer 4

1) Utilize flatMap and Object.keys to extract keys from an array containing objects.

let arr = [{ John: 0 }, { Doe: 50 }, { Marry: 100 }];

const result = arr.flatMap((o) => Object.keys(o));
console.log(result);

2) Retrieve all the values from an array

let arr = [{ John: 0 }, { Doe: 50 }, { Marry: 100 }];

const values = arr.flatMap((o) => Object.values(o));
console.log(values);

3) If you wish to uncover all the keys and values in an object

let arr = [{ John: 0 }, { Doe: 50 }, { Marry: 100 }];

const result = {
  keys: [],
  values: [],
};

for (let obj of arr) {
  Object.entries(obj).map(([k, v]) => {
    result.keys.push(k);
    result.values.push(v);
  });
}

console.log(result);

Answer 5

Answer №3

To gather all the keys and values from a nested array of objects, one can utilize the Array.prototype.reduce method to collect the keys and values separately into nested arrays by utilizing Object.keys() and Object.values():

const arr = [{'Alice': 20}, {'Bob': 30}, {'Eve': 40}];

const allKeysAndValues = arr.reduce((acc, cur) => {
  acc.keys.push(...Object.keys(cur));
  acc.values.push(...Object.values(cur));
  return acc;
}, { keys: [], values: [] });

console.log(allKeysAndValues);

Answer 6

To gather all the keys and values from a nested array of objects, one can utilize the Array.prototype.reduce method to collect the keys and values separately into nested arrays by utilizing Object.keys() and Object.values():

const arr = [{'Alice': 20}, {'Bob': 30}, {'Eve': 40}];

const allKeysAndValues = arr.reduce((acc, cur) => {
  acc.keys.push(...Object.keys(cur));
  acc.values.push(...Object.values(cur));
  return acc;
}, { keys: [], values: [] });

console.log(allKeysAndValues);

Answer 7

Answer №4

Here is a simple one-liner:

 let items = [{'Apple': 5}, {'Banana': 10}, {'Orange': 15}]
 
 console.log( items.map( item => Object.entries(item)));

Answer 8

Here is a simple one-liner:

 let items = [{'Apple': 5}, {'Banana': 10}, {'Orange': 15}]
 
 console.log( items.map( item => Object.entries(item)));

How can I efficiently retrieve the values of a object array if I am unaware of the keys associated with them?

Answer №1

Answer №2

Answer №3

Answer №4

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