Javascript JSON сортировка массива - PullRequest
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Javascript JSON сортировка массива

0 голосов
/ 01 марта 2020

Я пытаюсь создать пользовательскую функцию сортировки для приложения «Потеря веса», и когда пользователи пытаются щелкнуть неделю 1, чтобы отсортировать данные в формате JSON, показанные ниже, результат выглядит неправильно. Ценю, если вы можете руководствоваться с тем, что мне здесь не хватает. Я бы поменял 1-ю неделю на другую, если функция сработает. 

var array=[
  {
    "user": "Noah",
    "weeklyPercentageChange":["10.37","-3.75","-2.21","-1.85","-1.68","-1.21","-1.41","-1.17","-0.47","-1.64","-23.36"  ]
  },
  {
    "user": "Liam",
    "weeklyPercentageChange":["-4.49","-2.61","-1.19","-0.36","-1.39","-1.29","-0.44","-0.22","-0.67","-0.33","-12.53"  ]
  },
  {
    "user": "Mason",
    "weeklyPercentageChange":["3.22","-2.40","0.35","-1.80","-0.25","-0.66","-2.42","0.00","1.71","-0.52","-9.00"  ]
  },
  {
    "user": "Ethan",
    "weeklyPercentageChange":["-1.31","0.00","-1.75","-0.78","0.61","-1.79","0.80","0.00","0.00","0.38","-3.75"]
  },
  {
    "user": "Alexander",
    "weeklyPercentageChange":["-1.26","0.00","-1.48","-1.50","-0.07","-1.66","-0.53","-0.20","0.00","-0.86","-7.42"]
  },
  {
    "user": "Maria",
    "weeklyPercentageChange":["-1.10","-1.90","-0.11","-0.63","2.52","-1.01","0.06","-0.06","-0.06","1.38","-0.94"  ]
  },
  {
    "user": "Paul",
    "weeklyPercentageChange":["1.08","-2.33","-0.10","-1.17","1.83","-1.70","-1.13","-0.19","0.00","0.00","-5.84"]
  },
  {
    "user": "Steven",
    "weeklyPercentageChange":["-0.77","-2.93","0.19","-1.22","-0.48","-1.39","-1.27","0.00","-0.23","-0.91","-8.84"  ]
  },
  {
    "user": "Edward",
    "weeklyPercentageChange":["-0.71","-1.73","1.46","-0.17","0.42","-1.23","-1.26","1.47","0.59","-2.81","-3.98"]
  },
  {
    "user": "Benjamin",
    "weeklyPercentageChange":["0.56","-0.28","0.80","-0.94","0.00","0.90","-0.05","1.17","-1.87","0.98","0.14"]
  },
  {
    "user": "Zachary",
    "weeklyPercentageChange":["-0.47","-1.29","0.48","-1.59","1.37","-2.65","-0.24","0.66","0.05","0.24","-3.41"]
  },
  {
    "user": "Austin",
    "weeklyPercentageChange":["-0.33","0.00","-3.05","-2.02","0.80","-1.48","1.58","-0.43","0.87","-1.90","-5.87"]
  },
  {
    "user": "Jordan",
    "weeklyPercentageChange":["0.06","-2.18","2.17","-0.56","0.84","-0.67","0.45","0.39","0.28","0.06","0.67"]
  },
  {
    "user": "Gabriel",
    "weeklyPercentageChange":["0.00","0.00","-0.12","-0.81","0.25","0.00","0.00","0.00","0.00","0.00","-0.68"]
  },
  {
    "user": "Wayne",
    "weeklyPercentageChange":["0.20","-3.45","0.35","0.49","0.56","0.00","-0.61","0.54","0.54","-0.41","-1.83"]
  },
  {
    "user": "Willie",
    "weeklyPercentageChange":["-0.83","-3.21","0.71","0.00","-1.05","0.35","0.07","0.14","-0.07","-1.45","-3.72"]
  },
  {
    "user": "Frank",
    "weeklyPercentageChange":["0.00","0.00","-3.04","0.88","1.37","-0.41","-1.21","2.10","0.00","-0.58","-0.94"]
  }
];

function GetSortOrder(prop){
   return function(a,b){
      if( a[prop] > b[prop]){
          return 1;
      }else if( a[prop] < b[prop] ){
          return -1;
      }
      return 0;
   }
}

/* array.sort( GetSortOrder("user") );
document.write("Sorted User Names : <br>");

for (var item in array) {
 document.write("<br>"+array[item].user);
} */

array.sort( GetSortOrder("weeklyPercentageChange[0]") );

document.write("<br><br> Sorted Weekly Percentage Change : <br>");

for (var item in array) {
 document.write("<br>"+array[item].weeklyPercentageChange[0]);
}

1 Ответ

1 голос
/ 01 марта 2020

GetSortOrder("weeklyPercentageChange[0]") приведет к поиску буквального имени свойства "weeklyPercentageChange[0]", то есть, если объекты были определены примерно как 

{
  user: 'name',
  'weeklyPercentageChange[0]': 55
}

Это не то, что у вас есть, поэтому все работает не так, как ожидалось.

Для общего решения навигации по вложенному объекту или массиву для поиска значения для сортировки рассмотрите возможность передачи обратного вызова вместо него, чтобы перейти к вложенному значению, с которым вы хотите сравнить ; здесь, obj => obj.weeklyPercentageChange[0].

Вы также можете сделать код значительно более кратким, просто возвращая разницу между значениями: 

var array=[{user:"Noah",weeklyPercentageChange:["10.37","-3.75","-2.21","-1.85","-1.68","-1.21","-1.41","-1.17","-0.47","-1.64","-23.36"]},{user:"Liam",weeklyPercentageChange:["-4.49","-2.61","-1.19","-0.36","-1.39","-1.29","-0.44","-0.22","-0.67","-0.33","-12.53"]},{user:"Mason",weeklyPercentageChange:["3.22","-2.40","0.35","-1.80","-0.25","-0.66","-2.42","0.00","1.71","-0.52","-9.00"]},{user:"Ethan",weeklyPercentageChange:["-1.31","0.00","-1.75","-0.78","0.61","-1.79","0.80","0.00","0.00","0.38","-3.75"]},{user:"Alexander",weeklyPercentageChange:["-1.26","0.00","-1.48","-1.50","-0.07","-1.66","-0.53","-0.20","0.00","-0.86","-7.42"]},{user:"Maria",weeklyPercentageChange:["-1.10","-1.90","-0.11","-0.63","2.52","-1.01","0.06","-0.06","-0.06","1.38","-0.94"]},{user:"Paul",weeklyPercentageChange:["1.08","-2.33","-0.10","-1.17","1.83","-1.70","-1.13","-0.19","0.00","0.00","-5.84"]},{user:"Steven",weeklyPercentageChange:["-0.77","-2.93","0.19","-1.22","-0.48","-1.39","-1.27","0.00","-0.23","-0.91","-8.84"]},{user:"Edward",weeklyPercentageChange:["-0.71","-1.73","1.46","-0.17","0.42","-1.23","-1.26","1.47","0.59","-2.81","-3.98"]},{user:"Benjamin",weeklyPercentageChange:["0.56","-0.28","0.80","-0.94","0.00","0.90","-0.05","1.17","-1.87","0.98","0.14"]},{user:"Zachary",weeklyPercentageChange:["-0.47","-1.29","0.48","-1.59","1.37","-2.65","-0.24","0.66","0.05","0.24","-3.41"]},{user:"Austin",weeklyPercentageChange:["-0.33","0.00","-3.05","-2.02","0.80","-1.48","1.58","-0.43","0.87","-1.90","-5.87"]},{user:"Jordan",weeklyPercentageChange:["0.06","-2.18","2.17","-0.56","0.84","-0.67","0.45","0.39","0.28","0.06","0.67"]},{user:"Gabriel",weeklyPercentageChange:["0.00","0.00","-0.12","-0.81","0.25","0.00","0.00","0.00","0.00","0.00","-0.68"]},{user:"Wayne",weeklyPercentageChange:["0.20","-3.45","0.35","0.49","0.56","0.00","-0.61","0.54","0.54","-0.41","-1.83"]},{user:"Willie",weeklyPercentageChange:["-0.83","-3.21","0.71","0.00","-1.05","0.35","0.07","0.14","-0.07","-1.45","-3.72"]},{user:"Frank",weeklyPercentageChange:["0.00","0.00","-3.04","0.88","1.37","-0.41","-1.21","2.10","0.00","-0.58","-0.94"]}];

const GetSortOrder = getProp => (a,b) => getProp(a) - getProp(b);
array.sort( GetSortOrder(obj => obj.weeklyPercentageChange[0]) );
document.write("<br><br> Sorted Weekly Percentage Change : <br>");
for (var item in array) {
 document.write("<br>"+array[item].weeklyPercentageChange[0]);
}
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