如何从JSON对象中创建两个具有不同值的数组？

Question

I have the following JSON data:

jobHistoryJsonLst = [{
  "uuid" : "bGd_AAABNaMAAAFQHvY0UyTa",
  "startDate" : "2015-10-01 15:22:21",
  "endDate" : "2015-10-01 15:22:24",
  "executionTime" : "0:0:2.951"
}, {
  "uuid" : "lat_AAABqh4AAAFPQ8k0U_qu",
  "startDate" : "2015-09-23 10:50:02",
  "endDate" : "2015-09-23 10:50:06",
  "executionTime" : "0:0:3.284"
}]

I would like to create two different arrays from the above JSON object. One should contain all the startDate data and the other should contains all the executionTime data.

Expected Output:

startDateArr = ['2015-10-01 15:22:21', '2015-09-23 10:50:02']
execTimeArr = ['0:0:2.951', '0:0:3.284']

Answer 1

You can use .map or simple loop, like this

 var jobHistoryJsonLst = [{ "uuid" : "bGd_AAABNaMAAAFQHvY0UyTa", "startDate" : "2015-10-01 15:22:21", "endDate" : "2015-10-01 15:22:24", "executionTime" : "0:0:2.951" }, { "uuid" : "lat_AAABqh4AAAFPQ8k0U_qu", "startDate" : "2015-09-23 10:50:02", "endDate" : "2015-09-23 10:50:06", "executionTime" : "0:0:3.284" }]; var dates = [], times = [], len = jobHistoryJsonLst.length, i; for (i = 0; i < len; i++) { dates.push(jobHistoryJsonLst[i].endDate); times.push(jobHistoryJsonLst[i].executionTime); } console.log(dates, times); // or with .map var dates = jobHistoryJsonLst.map(function (el) { return el.endDate; }); var times = jobHistoryJsonLst.map(function (el) { return el.executionTime; }) console.log(dates, times); 

Answer 2

You can either use map() which means processing it twice or one loop with forEach and push it to the array yourself.

jobHistoryJsonLst = [{
  "uuid" : "bGd_AAABNaMAAAFQHvY0UyTa",
  "startDate" : "2015-10-01 15:22:21",
  "endDate" : "2015-10-01 15:22:24",
  "executionTime" : "0:0:2.951"
}, {
  "uuid" : "lat_AAABqh4AAAFPQ8k0U_qu",
  "startDate" : "2015-09-23 10:50:02",
  "endDate" : "2015-09-23 10:50:06",
  "executionTime" : "0:0:3.284"
}];

var start = jobHistoryJsonLst.map( function (obj) { return obj.startDate; } );
var end = jobHistoryJsonLst.map( function (obj) { return obj.endDate; } );

//or

var start = [], 
end = [];
jobHistoryJsonLst.forEach( function(obj) { 
    start.push(obj.startDate); 
    end.push(obj.endDate); 
});