Question

我有这个数组：

[
  {praticien: "place_1509136116761", H0709: false, H0911: false, H1113: false, H1315: false},
  {praticien: "place_1509136116773", H0709: false, H0911: false, H1113: false, H1315: false},
  {praticien: "place_1509136116699", H0709: true, H0911: false, H1113: false, H1315: false},
  {praticien: "place_1509136116734", H0709: false, H0911: true, H1113: true, H1315: false}
]

我需要一种方法来计算H0709 - H0911 - H1113 - H1315包含值“TRUE”的时间。

任何帮助？

Answer 1

var arr = [{praticien: "place_1509136116761", H0709: false, H0911: false, H1113: false, H1315: false}, {praticien: "place_1509136116773", H0709: false, H0911: false, H1113: false, H1315: false}, {praticien: "place_1509136116699", H0709: true, H0911: false, H1113: false, H1315: false}, {praticien: "place_1509136116734", H0709: false, H0911: true, H1113: true, H1315: false}]

var result = {
    true: 0,
  false: 0
}

arr.forEach(function(obj){ // iterates objects in array
  for (prop in obj ){ // iterates properties in object (only those of object not inherited)
    if (obj.hasOwnProperty(prop)) {
        if (obj[prop]) result.true++;
      else result.false++;
    }
  }
});

console.log(result);

这应该计算所有对象中有多少真实和谬误。只有它没有检查属性是否被命名为Hsomething。如果您需要，可以在if (obj.hasOwnProperty(prop))部分添加其他条件。

以下是演示：fiddle

编辑：只有以＆＃39; H＆＃39;开头的属性名称被考虑在内。

上述代码中已更改的行：

if (obj.hasOwnProperty(prop) && prop[0] === 'H') {

可在以下位置找到新演示： new fiddle

注意：console.log已添加到列表中考虑的属性。对于制作，请将其评论或删除。

Answer 2

您可以尝试过滤以获取具有您期望的值的对象

function predicate(object) {
  return object[H0709];
}

var objectsWithH0709AsTrue = myArray.filter(predicate);
var howManyTimesH0709IsTrue = objectsWithH0709AsTrue.length;

然而，有很多方法可以做到这一点。看看lodash＆＃39;一些。

Answer 3

您可以使用array#reduce循环浏览数据数组，并使用array#filter查找param中具有真正价值的所有密钥。

＆＃13;

const data = [{praticien: "place_1509136116761", H0709: false, H0911: false, H1113: false, H1315: false},{praticien: "place_1509136116773", H0709: false, H0911: false, H1113: false, H1315: false},{praticien: "place_1509136116699", H0709: true, H0911: false, H1113: false, H1315: false},{praticien: "place_1509136116734", H0709: false, H0911: true, H1113: true, H1315: false}],
      keys =['H0709', 'H0911', 'H1113', 'H1315'];

const result = data.reduce((sum,o) => {
  sum += keys.filter(k => o[k]).length;
  return sum;
},0)

console.log(result);

＆＃13;

要获取true值的所有键的计数，您可以使用array#reduce和array#forEach。在array#foreach内，检查密钥是否具有真值并添加该密钥并计数。

＆＃13;

const data = [{praticien: "place_1509136116761", H0709: false, H0911: false, H1113: false, H1315: false},{praticien: "place_1509136116773", H0709: false, H0911: false, H1113: false, H1315: false},{praticien: "place_1509136116699", H0709: true, H0911: false, H1113: false, H1315: false},{praticien: "place_1509136116734", H0709: false, H0911: true, H1113: true, H1315: false}];

const result = data.reduce((res,o) => {
  Object
    .keys(o)
    .forEach(k => {
      if(o[k] === true) 
        res[k] = (res[k] || 0) + 1 ;
    });
  return res;
},{});

console.log(result);

＆＃13;

Answer 4

                var data = [
                  {
                    praticien: "place_1509136116761",
                    H0709: false,
                    H0911: false,
                    H1113: false,
                    H1315: false
                  },
                  {
                    praticien: "place_1509136116773",
                    H0709: false,
                    H0911: false,
                    H1113: false,
                    H1315: false
                  },
                  {
                    praticien: "place_1509136116699",
                    H0709: true,
                    H0911: false,
                    H1113: false,
                    H1315: false
                  },
                  {
                    praticien: "place_1509136116734",
                    H0709: false,
                    H0911: true,
                    H1113: true,
                    H1315: false
                  }
                ]
            var result = { H0709: 0,H0911: 0,H1113: 0,H1315: 0};
                angular.forEach(data, function(obj){
                   if(obj.H0709){
                      result[H0709] = result[H0709]++;
                   }
                   if(obj.H0911){
                      result[H0911] = result[H0709]++;
                   }
                   if(obj.H1113){
                      result[H1113] = result[H0709]++;
                   }
                   if(obj.H1315){
                      result[H1315] = result[H0709]++;
                   }
                });

结果为{H0709：1，H0911：1，H1113：1，H1315：0}

表示H0709，H0911和H1113只有一次 TRUE ，而H1315是0次。

如何检测数组中是否存在值

4 个答案: