What is the best way to change an object into an array using JavaScript?

When retrieving data from Firebase, I encountered an issue where I needed to convert the object into an array. Despite trying to use a foreach loop with map, I was unable to successfully achieve this conversion and ended up with an array of length 0.

0: {id: "1", name: "Fever"}
1: {id: "2", name: "Cough"}
2: {id: "3", name: "Headache"}
3: {id: "4", name: "Stomach Pain"}

I attempted the following method without success:

let result = [];

arr.forEach(item => {
  let resObj = result.find(resObj => resObj.Name === item.Name);
  resObj ? resObj.Count++ : result.push({'Name':item.Name, 'Value': item.Value, 'Count': 1});
});

console.log(result);

The desired output should look like this:

[
{id: "1", name: "Fever"},{id: "2", name: "Cough"},{id: "3", name: "Headache"},{id: "4", name: "Stomach Pain"}
]

Answer №1

Follow this example to achieve the desired result:

let obj = {
  0: {
    id: "1",
    name: "Fever"
  },
  1: {
    id: "2",
    name: "Cough"
  },
  2: {
    id: "3",
    name: "Headache"
  },
  3: {
    id: "4",
    name: "Stomach Pain"
  }
};
let arr = [];
for (let key in obj) {
  arr.push(obj[key]);
}
console.log(arr);

The for ... in loop goes through each key in the object and adds all the values to the array.

Answer №2

If you were to utilize the Object.values() method, it's worth noting that it may not produce an array with the same keys as your original object. Consider this scenario:

{
  0: {id: "2", name: "Cough"},
  2: {id: "1", name: "Fever"} 
}

In such a case, the resulting array might look like this (missing index 2):

[{id: "1", name: "Fever"}, {id: "2", name: "Cough"}]

This implies that the order of elements in the new array does not correspond to the index values provided by the original object. To maintain this index-based ordering and include missing indices, consider merging the object with an array using Object.assign(). This approach ensures that the resulting order aligns with the index values:

const obj = {0: {id: "1", name: "Fever"}, 1: {id: "2", name: "Cough"}, 2: {id: "3", name: "Headache"}, 3: {id: "4", name: "Stomach Pain"}};

console.log(Object.assign([], obj));

Answer №3

Instead of looping through the object keys, you can simply use Object.values

let data = {
  0: {
    id: "1",
    name: "Apple"
  },
  1: {
    id: "2",
    name: "Banana"
  },
  2: {
    id: "3",
    name: "Orange"
  },
  3: {
    id: "4",
    name: "Grapes"
  }
};

const result = Object.values(data);

console.log(result);

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