Node.js highest object value

Question

With fs.readfile() i read an file and put the data of that file in an object. But how can i get the row with the highest value?

[ { id: 'AA', naam: 'de eerste', waarde: 100 },
  { id: 'BB', naam: 'de tweede', waarde: 120 },
  { id: 'CC', naam: 'de derde', waarde: 130 },
  { id: 'DD', naam: 'de laatste', waarde: 90 },
  { id: 'CC', naam: 'de derde', waarde: 150 },
  { id: 'CC', naam: 'de derde', waarde: 120 } ]

i mean the object row with the value of 150.

Not exact duplicate but you can refer to derive a solution: stackoverflow.com/questions/16509075/… — Rajesh Dixit
– Rajesh Dixit, Commented Jan 23, 2017 at 6:41

Pranav C Balan · Accepted Answer · 2017-01-23 07:42:49Z

5

Use Array#reduce method to reduce into a single object by custom function.

var data = [ { id: 'AA', naam: 'de eerste', waarde: 100 }, { id: 'BB', naam: 'de tweede', waarde: 120 }, { id: 'CC', naam: 'de derde', waarde: 130 }, { id: 'DD', naam: 'de laatste', waarde: 90 }, { id: 'CC', naam: 'de derde', waarde: 150 }, { id: 'CC', naam: 'de derde', waarde: 120 } ]

console.log(
  data.reduce(function(prev, next) {
    // compare object properties and return object with highest value
    return prev.waarde >= next.waarde ? prev : next;
  })
)

edited Jan 23, 2017 at 7:42

answered Jan 23, 2017 at 6:23

Pranav C Balan

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1 Comment

Rajesh Dixit Over a year ago

I have just formatted input data in 1 line so focus of answer remains on logic. If not required, please revert changes.

Community · Accepted Answer · 2020-06-20 09:12:55Z

An alternate to @Pranav C Balan's answer could be use of for loop.

Logic

Loop over Object and create a dummy variable to hold object with max value.
Now on every iteration, if value is greater than current Max, replace dummy variable

var data = [ { id: 'AA', naam: 'de eerste', waarde: 100 }, { id: 'BB', naam: 'de tweede', waarde: 120 }, { id: 'CC', naam: 'de derde', waarde: 130 }, { id: 'DD', naam: 'de laatste', waarde: 90 }, { id: 'CC', naam: 'de derde', waarde: 150 }, { id: 'CC', naam: 'de derde', waarde: 120 } ]

var result = data[0];

for(var i = 1; i< data.length; i++){
  if(result.waarde < data[i].waarde)
    result = data[i];
}

console.log(result)

Also note that objects are pass by reference, so if after the loop, you do result.waarde = 0, this will override object in data as well.

result = data[i]; will just copy reference of data[i] in result and not entire object.

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