Question

下面是代码，我用于获取特定groupby条件的聚合总计数。我最初，使用过滤条件获取所有记录，然后根据groupby列，我按列获取该组的每个不同值的计数。

allRecords.filter(
  function(r){
    return r[groupByCondition.column] == groupByCondition.value;
  }
).length;

如果groupbyColumn具有数值，则效果非常好。当按列分组时，它没有得到总计数。

对此有任何帮助将不胜感激。

Answer 1

使用parseInt / parseFloat将字符串转换为数字

return parseInt(r[groupByCondition.column]) == parseInt(groupByCondition.value);

Answer 2

问题是groupByCondition.column而groupByCondition.value期望groupByCondition = {"column": "col1", "value": "abc"}这样的对象，但您的问题以groupByCondition = {"col1": "abc"}的不同方式出现。

您可以更改groupByCondition对象以适应您以后访问它的方式：

＆＃13;

allRecords = [{"col1": "abc", "col2": "xyz"}, {"col1": "cde", "col2": "zxy"}, {"col1": "1", "col2": "bit"}, {"col1": 1, "col2": "byte"}];

function filterRecords(condition) {
  result = allRecords.filter(
    function(r){
      return r[condition.column] == condition.value;
    }
  );
                                             
  console.log('The result of filtering by '+JSON.stringify(condition)+' is');
  console.log(result);
  return result;
}

result = filterRecords({"column": "col1", "value": "abc"});
result = filterRecords({"column": "col1", "value": "cde"});
result = filterRecords({"column": "col1", "value": "1"});
result = filterRecords({"column": "col1", "value": 1});

＆＃13;

或者您可以更改访问它的方式以适应条件对象：

＆＃13;

allRecords = [{"col1": "abc", "col2": "xyz"}, {"col1": "cde", "col2": "zxy"}, {"col1": "1", "col2": "bit"}, {"col1": 1, "col2": "byte"}];

function filterRecords(condition) {
  key = Object.keys(condition)[0];
  result = allRecords.filter(
    function(r){
      return r[key] == condition[key];
    }
  );
                                             
  console.log('The result of filtering by '+JSON.stringify(condition)+' is');
  console.log(result);
  return result;
}

result = filterRecords({"col1": "abc"});
result = filterRecords({"col1": "cde"});
result = filterRecords({"col1": 1});
result = filterRecords({"col1": "1"});

＆＃13;

这两个示例都假设您根据仅1列/属性的值过滤记录。如果您想根据多个条件对其进行过滤，则需要额外的工作。

javascript - string＆amp;数值比较

2 个答案: