JSON data to JavaScript

Question

When I do JArray.toSource(), I get this:-

[{selectionID:"1", cnt:"5"}, {selectionID:"2", cnt:"2"}, {selectionID:"3", cnt:"1"}]

How can I convert JArray to format like this:-

[[1,5],[2,2],[3,1]]

in JavaScript.

Eventually I want newJArray.toSource() become [[1,5],[2,2],[3,1]]

pimvdb · Accepted Answer · 2012-02-15 14:17:56Z

3

You can use Object.keys which returns the keys, and map to map the array as such:

array.map(function(arrayItem) {
  return Object.keys(arrayItem).map(function(objectKey) {
    return +arrayItem[objectKey]; // convert to number
  });
});

Basically, you replace each element in the array with the values of the object.

answered Feb 15, 2012 at 14:17

pimvdb

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Comments

peterfoldi · Accepted Answer · 2012-02-15 15:42:00Z

1

pimvdb's solution is very nice. My comment is that in this particular case this is enough:

array.map(function(arrayItem) {
    return [arrayItem.selectionID, arrayItem.cnt];
});

It is uglier (more specific), but my gut feeling is that it's much more efficient (and sometimes that matters).

answered Feb 15, 2012 at 15:42

peterfoldi

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1 Comment

Gian Over a year ago

newJArray= JArray.map(function(){ return [JArray.selectionID, JArray.cnt]; }); become [[(void 0), (void 0)], [(void 0), (void 0)], [(void 0), (void 0)]] Am I missing something here where JArray[??].selectionID

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