How to make such a loop for sorting JSON?

Question

JavaScript

Such a task.
There is JSON

[{"date":"2015 August","value":"40"},
{"date":"2016 August","value":"473"},
{"date":"2016 July","value":"106"},
{"date":"2016 June","value":"55"},
{"date":"2016 November","value":"3"},
{"date":"2016 October","value":"2"},
{"date":"2016 September","value":"287"},
{"date":"2016 August","value":"3"},
{"date":"2016 July","value":"4"},
{"date":"2016 September","value":"5"}]

We need objects in which the data value matches to be combined into one (data remains, and value is added)
Sort the data value in ascending order and make it look like new Date

[
            { date: new Date('2016 August'), value: 24 },
            { date: new Date('2016 September'), value: 44 },
            { date: new Date('2016 November'), value: 27 },
            ...
]

Help me to understand.

Answer 1

// редьюсим по полю даты
var result = array.reduce(function(result, item) {
    if (!result.hasOwnProperty(item.date) ) {
          result[item.date] = 0;
    }
    result[item.date] += parseInt(item.value, 10);
    return result;
}, {});

console.log(result);
// преобразование в массив
var resultArray = [];
Object.keys(result).forEach(function(key) {
  resultArray.push({
    date: key,
    value: result[key],
  })
});
console.log(resultArray);

https://jsfiddle.net/45ryehks/