Generate dates and add new property to object array
I have no control over the list of data, but I need to map it to date range data.
The data list looks like only inside and out.
[
{
"date_from": "2017-05-06 00:00:00",
"date_to": "2017-05-08 23:59:59",
"state": {
"name": "San francisco"
}
}
{
"date_from": "2017-05-03 00:00:00",
"date_to": "2017-05-07 23:59:59",
"state": {
"name": "Las Vegas"
}
}
]
I can create a base of a date range per month
function generateDates(startDate, stopDate) {
var dateArray = [];
var currentDate = moment(startDate);
var stopDate = moment(stopDate);
while (currentDate <= stopDate) {
dateArray.push({
date: moment(currentDate).format('YYYY-MM-DD')
});
currentDate = moment(currentDate).add(1, 'days');
}
return dateArray;
}
generateDates('2017-05-01', '2017-05-31');
How can I put the state object into an array of date ranges like
[
{date: '2017-05-06', state:{name:'San francisco'}},
{date: '2017-05-07', state:{name:'San francisco'}},
{date: '2017-05-08', state:{name:'San francisco'}},
..
..
]
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1 answer
var sparse=input.reduce((sparse,event)=>generateDates(event.date_from,event.date_to).forEach(date=>(sparse[date]=sparse[date]||[]).push(event))||sparse,{});
var result=[];
for(date in sparse){
result.push({date:date,states:sparse[date].map(el=>el.state)});
}
http://jsbin.com/larumiyeli/edit?console
Or, if you don't want to group:
var result=input.reduce((sparse,event)=>sparse.concat(generateDates(event.date_from,event.date_to).map(el=>(el.state=event.state,el)),[]);
http://jsbin.com/mixorecoyo/edit?console
See the other answer for an explanation ... Looks like a class here, doesn't it?;)
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