Javascript 基于“减少对象数组”；类别“；“财产和金额”；“金额”；财产

我有一个JSON对象，格式如下：

balance = [{category:"clothing", amount:"120.50"}, {category:"groceries", amount:"145.23"}, {category:"clothing", amount:"97.34"}];

merged_totals = [{category:"clothing", amount:"217.84"}, {category:"groceries", amount:"145.23"}]

我想把它简化成这样：

balance = [{category:"clothing", amount:"120.50"}, {category:"groceries", amount:"145.23"}, {category:"clothing", amount:"97.34"}];

merged_totals = [{category:"clothing", amount:"217.84"}, {category:"groceries", amount:"145.23"}]

这是我目前正在使用的代码，它非常简单，但没有按照需要格式化对象，如上所示：

combineCategories = function (data) {

  var newData = [];

  for (var prop in data) {
    newData[ data[prop].category ] = 0; // set initial value otherwise it will be undefined
  }

  for (var prop in data) {
    newData[ data[prop].category ] += +data[prop].amount;
  }

  console.log(newData);

}

这将返回：

// [Clothing: 195, Groceries: 140, Deposit: 995.6]