CODEWITHSUNDEEP
javascriptarraysecmascript-6
ThexBasic
ThexBasic

Reputation: 714

JS / ES6: Object to Array conversion

One of my node js libraries is returning some data I need in the wrong format like this:

{"a":["1","2"],"b":["3","4"],"c":["5","6"]}

(note that the values don't matter) but I need to loop this array in a way, that I find my B for my A that has a certain value (in this case e.g. '2', I would need '4') and all other parts of my program are so far using arrays like this:

[{"a":"1", "b":"3", "c":"5"}, {"a":"2", "b":"4", "c":"6"}]

and it would be my preferred approach.

Also note that the amount of data in a is always the same as b and c, but itself is variable.

So what would be the "best" way to accomplish this in ES6/JS (before I start messing with for-loops)?

Upvotes: 2

Views: 137

Answers (1)

Robbie Speed
Robbie Speed

Reputation: 81

If you are looking to transform an object like

{"a":["1","2"],"b":["3","4"],"c":["5","6"]}

Into a array like

[{"a":"1","b":"3","c":"5"},{"a":"2","b":"4","c":"6"}]

Something like this is the simplest way I can think of

function formatData (data) {
  return Object.keys(data).reduce((arr, key) => {
    data[key].forEach((value, i) => {
     const iObj = arr[i] || (arr[i] = {});
     iObj[key] = value;
    });
    return arr;
  }, []);
}

Upvotes: 2

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