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Filter json by key value

I searched for a stack overflow for about 30 minutes, but none of the solutions help me. I have the following json ...

[{"time":"2016-07-26 09:02:27","type":"aa"},
{"time":"2016-04-21 20:35:07","type":"ae"},
{"time":"2016-08-20 03:31:57","type":"ar"},
{"time":"2017-01-19 22:58:06","type":"ae"},
{"time":"2016-08-28 10:19:27","type":"ae"},
{"time":"2016-12-06 10:36:22","type":"ar"},
{"time":"2016-07-09 12:14:03","type":"ar"},
{"time":"2016-10-25 05:05:37","type":"ae"},
{"time":"2016-06-05 07:57:18","type":"ae"},
{"time":"2016-10-08 22:03:03","type":"aa"},
{"time":"2016-08-13 21:27:37","type":"ae"},
{"time":"2016-04-09 07:36:16","type":"ar"},
{"time":"2016-12-30 17:20:08","type":"aa"},
{"time":"2016-03-11 17:31:46","type":"aa"},
{"time":"2016-05-04 14:08:25","type":"ar"},
{"time":"2016-11-29 05:21:02","type":"ar"},
{"time":"2016-03-08 05:46:01","type":"ar"},
]

I want to keep the array in the same format, but include only objects with type "ar". How can I filter this json with javascript to include only the types that I need?

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4 answers

You must use the method filter.

The method filter()creates a new one arraywith all the elements that pass the test implemented by the provided function.

- callback, .

var arr=[{"time":"2016-07-26 09:02:27","type":"aa"},
{"time":"2016-04-21 20:35:07","type":"ae"},
{"time":"2016-08-20 03:31:57","type":"ar"},
{"time":"2017-01-19 22:58:06","type":"ae"},
{"time":"2016-08-28 10:19:27","type":"ae"},
{"time":"2016-12-06 10:36:22","type":"ar"},
{"time":"2016-07-09 12:14:03","type":"ar"},
{"time":"2016-10-25 05:05:37","type":"ae"},
{"time":"2016-06-05 07:57:18","type":"ae"},
{"time":"2016-10-08 22:03:03","type":"aa"},
{"time":"2016-08-13 21:27:37","type":"ae"},
{"time":"2016-04-09 07:36:16","type":"ar"},
{"time":"2016-12-30 17:20:08","type":"aa"},
{"time":"2016-03-11 17:31:46","type":"aa"},
{"time":"2016-05-04 14:08:25","type":"ar"},
{"time":"2016-11-29 05:21:02","type":"ar"},
{"time":"2016-03-08 05:46:01","type":"ar"},
];
var filtered=arr.filter(function(item){
    return item.type=="ar";         
});
console.log(filtered);
Hide result

, shorter:

var filtered = arr.filter(a=>a.type=="ar");
+7

filter. :

var result = a.filter(function(v){
    return v.type==='ar';
})

, .

var list = [
  {"time":"2016-07-26 09:02:27","type":"aa"},
  {"time":"2016-04-21 20:35:07","type":"ae"},
  {"time":"2016-08-20 03:31:57","type":"ar"},
  {"time":"2017-01-19 22:58:06","type":"ae"},
  {"time":"2016-08-28 10:19:27","type":"ae"},
  {"time":"2016-12-06 10:36:22","type":"ar"},
  {"time":"2016-07-09 12:14:03","type":"ar"},
  {"time":"2016-10-25 05:05:37","type":"ae"},
  {"time":"2016-06-05 07:57:18","type":"ae"},
  {"time":"2016-10-08 22:03:03","type":"aa"},
  {"time":"2016-08-13 21:27:37","type":"ae"},
  {"time":"2016-04-09 07:36:16","type":"ar"},
  {"time":"2016-12-30 17:20:08","type":"aa"},
  {"time":"2016-03-11 17:31:46","type":"aa"},
  {"time":"2016-05-04 14:08:25","type":"ar"},
  {"time":"2016-11-29 05:21:02","type":"ar"},
  {"time":"2016-03-08 05:4601","type":"ar"},
];

var result = list.filter(function(obj, index){
  return obj.type==='ar';
})

console.log(result);
Hide result
+2

filter, , , data.filter((x)=>x.type === "ar");

filter , x.type === "ar"

var data =[{"time":"2016-07-26 09:02:27","type":"aa"},
{"time":"2016-04-21 20:35:07","type":"ae"},
{"time":"2016-08-20 03:31:57","type":"ar"},
{"time":"2017-01-19 22:58:06","type":"ae"},
{"time":"2016-08-28 10:19:27","type":"ae"},
{"time":"2016-12-06 10:36:22","type":"ar"},
{"time":"2016-07-09 12:14:03","type":"ar"},
{"time":"2016-10-25 05:05:37","type":"ae"},
{"time":"2016-06-05 07:57:18","type":"ae"},
{"time":"2016-10-08 22:03:03","type":"aa"},
{"time":"2016-08-13 21:27:37","type":"ae"},
{"time":"2016-04-09 07:36:16","type":"ar"},
{"time":"2016-12-30 17:20:08","type":"aa"},
{"time":"2016-03-11 17:31:46","type":"aa"},
{"time":"2016-05-04 14:08:25","type":"ar"},
{"time":"2016-11-29 05:21:02","type":"ar"},
{"time":"2016-03-08 05:46:01","type":"ar"},
];
           
var result = data.filter((x)=>x.type === "ar");
console.log(result);
Hide result
+1

, ,

var list = [{"time":"2016-07-26 09:02:27","type":"aa"},
{"time":"2016-04-21 20:35:07","type":"ae"},
{"time":"2016-08-20 03:31:57","type":"ar"},
{"time":"2017-01-19 22:58:06","type":"ae"},
{"time":"2016-08-28 10:19:27","type":"ae"},
{"time":"2016-12-06 10:36:22","type":"ar"},
{"time":"2016-07-09 12:14:03","type":"ar"},
{"time":"2016-10-25 05:05:37","type":"ae"},
{"time":"2016-06-05 07:57:18","type":"ae"},
{"time":"2016-10-08 22:03:03","type":"aa"},
{"time":"2016-08-13 21:27:37","type":"ae"},
{"time":"2016-04-09 07:36:16","type":"ar"},
{"time":"2016-12-30 17:20:08","type":"aa"},
{"time":"2016-03-11 17:31:46","type":"aa"},
{"time":"2016-05-04 14:08:25","type":"ar"},
{"time":"2016-11-29 05:21:02","type":"ar"},
{"time":"2016-03-08 05:46:01","type":"ar"},
]

var newList = [];

for (var i = 0; i < list.length; i++) {
    if (list[i].type === 'ar') {
        newList.push(list[i]);
    }
}

console.log(newList);
0

Source: https://habr.com/ru/post/1669293/

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