CODEWITHSUNDEEP
javascriptarraysobjectcompare
Anton Bollen Forsberg
Anton Bollen Forsberg

Reputation: 45

Compare object with objects in array and replace value where key match

I have one object and an array of objects. I want to compare all the objects in the array with the single, hard coded object, and then replace some values where the object properties match.

The single, hardcoded object, describes how a complete dataset should look like when it is correct. Each property has a value of null. This value should be replaced by the value of any object in the array, if the property matches any of the properties in the single one.

// single object (hard coded)

var completeDataSet = {
  jan: null,
  jan;prognosis: null,
  feb: null,
  feb;prognosis: null,
  mar: null,
  mar;prognosis: null,
  apr: null,
  apr;prognosis: null,
  may: null,
  may;prognosis: null,
  jun: null,
  jun;prognosis: null,
  jul: null,
  jul;prognosis: null,
  aug: null,
  aug;prognosis: null,
  sep: null,
  sep;prognosis: null,
  oct: null,
  oct;prognosis: null,
  nov: null,
  nov;prognosis: null,
  dec: null,
  dec;prognosis: null
}

And the array of objects could look something like this:

//Array of objects with missing properties
var data = [{
  jan: 0.258,
  jan;prognosis: false,
  feb: 15.256,
  feb;prognosis: false,
  apr: 0.0156,
  apr;prognosis: true,
  oct: 1.235,
  oct;prognosis: true,
  nov: 3.587,
  nov;prognosis: false
},{
  feb: 12.154,
  feb;prognosis: true,
  apr: 1.015,
  apr;prognosis: true,
  sep: 0.235,
  sep;prognosis: false,
  oct: 15.201,
  oct;prognosis: true,
  nov: 12.158,
  nov;prognosis: false,
  dec: 125.152,
  dec;prognosis: true
}];

I want the end result to look something like this: 

var correctArrayOfData = [{
  jan: 0.258,
  jan;prognosis: false,
  feb: 15.256,
  feb;prognosis: false,
  mar: null,
  mar;prognosis: null,
  apr: 0.0156,
  apr;prognosis: true,
  may: null,
  may;prognosis: null,
  jun: null,
  jun;prognosis: null,
  jul: null,
  jul;prognosis: null,
  aug: null,
  aug;prognosis: null,
  sep: null,
  sep;prognosis: null,
  oct: 1.235,
  oct;prognosis: true,
  nov: 3.587,
  nov;prognosis: false,
  dec: null,
  dec;prognosis: null
},{
  jan: null,
  jan;prognosis: null,
  feb: 12.154,
  feb;prognosis: true,
  mar: null,
  mar;prognosis: null,
  apr: 1.015,
  apr;prognosis: true,
  may: null,
  may;prognosis: null,
  jun: null,
  jun;prognosis: null,
  jul: null,
  jul;prognosis: null,
  aug: null,
  aug;prognosis: null,
  sep: 0.235,
  sep;prognosis: false,
  oct: 15.201,
  oct;prognosis: true,
  nov: 12.158,
  nov;prognosis: false,
  dec: 125.152,
  dec;prognosis: true
}]

As you can see i have filled in the values if the key matches, and left the unmatched props and values to be null.

Can you please help me with this one.

Thanks!

Upvotes: 0

Views: 370

Answers (1)

Ele
Ele

Reputation: 33726

Use the expected result as template and then assign the attributes to the array correctArrayOfData.

var data = [{  jan: 0.258,  'jan;prognosis': false,  feb: 15.256,  'feb;prognosis': false,  apr: 0.0156,  'apr;prognosis': true,  oct: 1.235,  'oct;prognosis': true,  nov: 3.587,  'nov;prognosis': false},{  feb: 12.154,  'feb;prognosis': true,  apr: 1.015,  'apr;prognosis': true,  sep: 0.235,  'sep;prognosis': false,  oct: 15.201,  'oct;prognosis': true,  nov: 12.158,  'nov;prognosis': false,  dec: 125.152,  'dec;prognosis': true}];
var template = {  jan: null,  'jan;prognosis': null,  feb: null,  'feb;prognosis': null,  mar: null,  'mar;prognosis': null,  apr: null,  'apr;prognosis': null,  may: null,  'may;prognosis': null,  jun: null,  'jun;prognosis': null,  jul: null,  'jul;prognosis': null,  aug: null,  'aug;prognosis': null,  sep: null,  'sep;prognosis': null,  oct: null,  'oct;prognosis': null,  nov: null,  'nov;prognosis': null,  dec: null,  'dec;prognosis': null};

var correctArrayOfData = data.map(o => Object.assign(Object.assign({}, template), o));
console.log(correctArrayOfData);
.as-console-wrapper { max-height: 100% !important; top: 0; }

Upvotes: 2

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