You could use Array.map here

var arr = oldArr.map(function(obj){
    var key = Object.keys(obj).sort()[1], rtn = {};    
    return rtn[key] = obj[key], rtn;
});

What you're doing is taking the second key and then returning a new Object with that key and value.

Here is a JsFiddle Example

var json = '{}' // your data;

// convert to javascript object:
var obj = JSON.parse(json);

// get last item in array:
var last = obj.education[obj.education.length - 1].school.name;
// result: some COLLEGE NAME I WANT TO GET

Use map. It's much simpler:

var arr = data.personnes.map(function (el) {
  return el.departement;
});

console.log(arr); // ["bas-rhin", "eure"]

Alternatively, using jQuery's $.map:

var arr = $.map(data.personnes, function (el) {
  return el.departement;
});

Fiddle

If you need a polyfill for map:

if (!('map' in Array.prototype)) {
  Array.prototype.map = function (mapper, that /*opt*/) {
    var other = new Array(this.length);
    for (var i = 0, n = this.length; i < n; i++) {
      if (i in this) { other[i] = mapper.call(that, this[i], i, this); }
    }
    return other;
  };
}

var json_data = {"2013-01-21":1,"2013-01-22":7};
var result = [];

for(var i in json_data)
    result.push([i, json_data [i]]);


var data = new google.visualization.DataTable();
data.addColumn('string', 'Topping');
data.addColumn('number', 'Slices');
data.addRows(result);

http://jsfiddle.net/MV5rj/

You need to loop through the array and then parse the stringified JSON so that you can access the data array. Then simply loop that data array to get the value of each name property.

var arr = [{
  "assetName": "LCT",
  "assetValue": "",
  "typeValueInput": "select",
  "valueInputSelect": null,
  "required": true,
  "valueInput": "{\"data\":[{\"name\":\"name1\",\"id\":\"12\"},{\"name\":\"name2\",\"id\":\"13\"},{\"name\":\"name3\",\"id\":\"14\"}]}"
}];

arr.forEach((arrObj) => {
  var jsonData = JSON.parse(arrObj.valueInput);
  jsonData.data.forEach(({name}) => console.log(name));
});

You can loop the array with a for loop and the object properties with for-in loops.

for (var i=0; i<result.length; i++)
    for (var name in result[i]) {
        console.log("Item name: "+name);
        console.log("Source: "+result[i][name].sourceUuid);
        console.log("Target: "+result[i][name].targetUuid);
    }

That's because your base object is an array as well.

console.log(dataJS[0].comments[0]);

I suspect that would work

Here is the idea :

JSONObject root = new JSONObject(yourJsonString);
JSONArray sportsArray = root.getJSONArray("sports");

// now get the first element:
JSONObject firstSport = sportsArray.getJSONObject(0);

// and details of the first element
String name = firstSport.getString("name"); // basketball
int id = firstSport.getInt("id"); // 40
JSONArray leaguesArray = firstSport.getJSONArray("leagues");

// and so on, you can process leaguesArray similarly

It should work (feel free to complain about compile errors if there are any)