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Javascript : Construct array from an array with duplicate elements by property [duplicate]

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I have an array of objects that I would like to convert to a new array with different structure by removing duplicate elements based on an attribute of the array.
For example, this array would be filtered by date property:

var arrayWithDuplicates = [

"date":"02/08/2018",
"startTime": "09:00",
"endTime": "12:00"
,

"date":"02/08/2018",
"startTime": "14:00",
"endTime": "17:00"

];


==> would become :

var newArray = [
{
"date":"02/08/2018",
"times": [

"startTime": "09:00",
"endTime": "12:00"
,
"startTime": "14:00",
"endTime": "17:00"

]
];


So, how can i do this using js(ES5) or angularjs

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

1 Answer
1

You can use array reduce and findIndex.findIndex will be used to check if there exist a date ,if it exist it will return a index. Use this index to find the element in the new array and there just update the times array

findIndex

findIndex

times

var arrayWithDuplicates = [
"date": "02/08/2018",
"startTime": "09:00",
"endTime": "12:00"
,

"date": "02/08/2018",
"startTime": "14:00",
"endTime": "17:00"

];
let newArray = arrayWithDuplicates.reduce(function(acc,curr)
let checkIfExist = acc.findIndex(function(item)
return item.date === curr.date
);
if(checkIfExist ===-1)
let obj = ;
obj.date = curr.date;
obj.times = [
startTime:curr.startTime,
endTime:curr.endTime
]
acc.push(obj);

else
acc[checkIfExist].times.push(
startTime:curr.startTime,
endTime:curr.endTime
)


return acc;
,);

console.log(newArray)