Find duplicate values between two separate javascript objects?

Question

I have two javascript arrays of objects:

var fullDateRange=[{date:"4/1/18",value:0},{date:"4/2/18",value:0},{date:"4/3/18",value:0},{date:"4/4/18",value:0},{date:"4/5/18",value:0}]

and

var actualDateRange=[{date:"4/1/18",value:1},{date:"4/3/18",value:3},{date:"4/5/18",value:5}]

I'm trying to loop through the fullDateRange array, see if any of the actualDateRange dates exist, and increment the value. But I keep getting duplicates with this code:

   function outputDeltaDates(fullDateObj, responseObj) {
    var dateArr = [],
      valueArr = [];
    $.each(fullDateObj, function(index) {
      var fullDate = this;
      var counter = 0
      $.each(responseObj, function(index) {
        var fullResponse = this;
        if (fullResponse['date'] == fullDate['date']) {
          valueArr.push(fullResponse['value'])
          dateArr.push(fullDate['date'])
        } else {
          if (!dateArr.includes(fullDate['date'])) {
            valueArr.push(0)
            dateArr.push(fullDate['date'])
          }
        }
      })
    })
    return [valueArr, dateArr]
  }

baao · Accepted Answer · 2018-04-20 21:04:56Z

1

To increment the objects value property if the date exists in the other array, simply loop it once and increment value if the date is found in actualDateRange

var fullDateRange=[{date:"4/1/18",value:0},{date:"4/2/18",value:0},{date:"4/3/18",value:0},{date:"4/4/18",value:0},{date:"4/5/18",value:0}]
var actualDateRange=[{date:"4/1/18",value:1},{date:"4/3/18",value:3},{date:"4/5/18",value:5}]

fullDateRange.forEach(e => {
    let act = actualDateRange.find(a => a.date === e.date);
    if (act) e.value += act.value;
})

console.log(fullDateRange);

edited Apr 20, 2018 at 21:04

answered Apr 20, 2018 at 20:20

baao

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2 Comments

danywigglebutt Over a year ago

Wait, a.value doesn't exist in the forEach loop. How do I access the "found" date row in 2nd list? @baao

baao Over a year ago

Edited the answer to do that @Ethans123, I wasn't sure what you want to add

Naga Sai A · Accepted Answer · 2018-04-20 20:35:17Z

To achieve expected result, push incremented counter to valueArr i.e

valueArr.push(++counter)

instead of fullResponse['value'] (which will push actualDateRange value)

var fullDateRange=[{date:"4/1/18",value:0},{date:"4/2/18",value:0},{date:"4/3/18",value:0},{date:"4/4/18",value:0},{date:"4/5/18",value:0}]
var actualDateRange=[{date:"4/1/18",value:1},{date:"4/3/18",value:3},{date:"4/5/18",value:5}]

function outputDeltaDates(fullDateObj, responseObj) {
    var dateArr = [],
      valueArr = [];
    $.each(fullDateObj, function(index) {
      var fullDate = this;
      var counter = 0
      $.each(responseObj, function(index) {
        var fullResponse = this;
        if (fullResponse['date'] == fullDate['date']) {
          valueArr.push(++counter)
          dateArr.push(fullDate['date'])
        } else {
          if (!dateArr.includes(fullDate['date'])) {
            valueArr.push(0)
            dateArr.push(fullDate['date'])
          }
        }
      })
    })
     return [valueArr, dateArr]
  } 

console.log(outputDeltaDates(fullDateRange, actualDateRange))

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>

code sample - https://codepen.io/nagasai/pen/rvVqdW?editors=1010

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