construct an array with key value pairs using a given object with key value pairs in javascript [closed]

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I have a data object like this :

{ '108': '4',
  '1001': '4',
  '1027': '1',
  '1128': '2',
  '1284': '1',
  '1300': '4',
  '1313': '4',
  '1327': '2',
  '1334': '1',
  '1351': '4',
  '1356': '1' }

Here for eg '108' is the key and '4' is the value.

I have declared an array called valuearray;

Now I want to put the data object into the extarray.

What i have done :

        var x;
        var count = 0;
        for(x in data){
            extarray[count] = data[x];
            count++;
        }

x refers to the keys in data object I have used the count variable to set index in extarray.

when i do console.log(extarray) it gives me the output as

[ '4',
  '4',
  '1',
  '2',
  '1',
  '4',
  '4',
  '2']

but my expected output for console.log(extarray) is :

      ['108': '4',
      '1001': '4',
      '1027': '1',
      '1128': '2',
      '1284': '1',
      '1300': '4']

where 108 is the key and 4 is the value in reference to the above expected array. if i do it like extarray[x] then it doesnt work as expected.

my basic requirement is that the key and value in the data object and the extarray should be same If I do extarray[1001] then the output should come as 4 (refer the data object) How do I do it?

You already have an object with these keys and values. Arrays don't (normally) have keys and values. — Mark
– Mark, Commented Dec 19, 2018 at 8:49
@pravinnavle you already have that, no need to do anything at all. — briosheje
– briosheje, Commented Dec 19, 2018 at 8:52
@pravinnavle what is the exact requirement? being unable to use Objects? if so, you just can't do that with regular arrays, please clarify the requirements and eventual limitations. — briosheje
– briosheje, Commented Dec 19, 2018 at 8:55

Ori Drori · Accepted Answer · 2018-12-19 08:59:20Z

2

You can create a sparse array from the object, using Array.from().

To find the length of the new array, get the keys of the object with Object.keys(), and find the maximum by spreading into Math.max().

const obj = {"108":"4","1001":"4","1027":"1","1128":"2","1284":"1","1300":"4","1313":"4","1327":"2","1334":"1","1351":"4","1356":"1"};
  
const arr = Array.from({ ...obj, length: Math.max(...Object.keys(obj)) });

console.log(arr[1001]); // 4
console.log(arr['1027']); // 1

console.log(arr);

edited Dec 19, 2018 at 8:59

answered Dec 19, 2018 at 8:55

Ori Drori

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6 Comments

briosheje Over a year ago

Seems like he needs to access keys using strings rather than number (not exactly clear, but he is mentioning string keys). Clever approach though.

Ori Drori Over a year ago

Thanks. He can access the items with strings as well (see updated example).

node_man Over a year ago

Thanks. let me try this

node_man Over a year ago

Thanks a lot this worked for me

Ori Drori Over a year ago

You're welcome :)

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