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If I sort array I cant use map. 

var arrQuestByDate = new Array();
action.payload.data.forEach(function(item){
  if(typeof(arrQuestByDate[item.date])==='undefined'){
    arrQuestByDate[item.date]= new Array();  
  }
  arrQuestByDate[item.date].push(item);
  console.log(arrQuestByDate[item.date].length) //this output good value
})
console.log(arrQuestByDate.length) //this output 0

I dont know why my array length is 0

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6
  • The square bracket syntax is for objects, not arrays. Commented Dec 6, 2017 at 14:07
  • you should post your entire code... Commented Dec 6, 2017 at 14:07
  • What is that arrQuestByDate[item.date] ? Commented Dec 6, 2017 at 14:12
  • Looking at your code, arrQuestByDate should be object. Please share input and expected output. Commented Dec 6, 2017 at 14:13
  • 1
    There is nothing related to Axios nor to React in this code, your issue may lie in code you did not shared Commented Dec 6, 2017 at 14:35

1 Answer 1

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1

You can use groupBy function from lodash. If you don't want to use external library, this code shoudl work

var quotestByDate = action.payload.data
    .reduce( function(acc, quote) {     
        if (!acc[quote.date]) {
            acc[quote.date] = [];
        }
        acc[quote.date].push(quote);
        return acc;
    }, {});

console.log(Object.keys(quotestByDate).length);
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