Converting JavaScript object with numeric keys into array

user_2218452 0
Viewed 677029

I have an object like this coming back as a JSON response from the server:

{
  "0": "1",
  "1": "2",
  "2": "3",
  "3": "4"
}

I want to convert it into a JavaScript array like this:

["1","2","3","4"]

Is there a best way to do this? Wherever I am reading, people are using complex logic using loops. So are there alternative methods to doing this?

javascript-objects arrays jquery json javascript
17 Answers

var obj = {"0":"1","1":"2","2":"3","3":"4"};

var vals = Object.values(obj);

console.log(vals); //["1", "2", "3", "4"]

Another alternative to the question

var vals = Object.values(JSON.parse(obj)); //where json needs to be parsed
user_43880800

You can use Object.assign() with an empty array literal [] as the target:

const input = {
  "0": "1",
  "1": "2",
  "2": "3",
  "3": "4"
}

const output = Object.assign([], input)

console.log(output)

If you check the polyfill, Object.assign(target, ...sources) just copies all the enumerable own properties from the source objects to a target object. If the target is an array, it will add the numerical keys to the array literal and return that target array object.

user_30822960

The accepted solution expects the keys start from 0 and are continuous - it gets the values into the array, but looses the indexes on the way.

Use this if your "object with numerical keys" does not fulfill those stricter assumptions.

//let sourceObject = ...
let destinationArray = [];
Object.keys(sourceObject).forEach(k => destinationArray[k] = sourceObject[k]);
user_81193170

You can convert json Object into Array & String using PHP.

$data='{"resultList":[{"id":"1839","displayName":"Analytics","subLine":""},{"id":"1015","displayName":"Automation","subLine":""},{"id":"1084","displayName":"Aviation","subLine":""},{"id":"554","displayName":"Apparel","subLine":""},{"id":"875","displayName":"Aerospace","subLine":""},{"id":"1990","displayName":"Account Reconciliation","subLine":""},{"id":"3657","displayName":"Android","subLine":""},{"id":"1262","displayName":"Apache","subLine":""},{"id":"1440","displayName":"Acting","subLine":""},{"id":"710","displayName":"Aircraft","subLine":""},{"id":"12187","displayName":"AAC","subLine":""}, {"id":"20365","displayName":"AAT","subLine":""}, {"id":"7849","displayName":"AAP","subLine":""}, {"id":"20511","displayName":"AACR2","subLine":""}, {"id":"28585","displayName":"AASHTO","subLine":""}, {"id":"45191","displayName":"AAMS","subLine":""}]}';

$b=json_decode($data);

$i=0;
while($b->{'resultList'}[$i])
{
    print_r($b->{'resultList'}[$i]->{'displayName'});
    echo "<br />";
    $i++;
}
user_85527880
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