The best way to remove duplicates from an array of objects in JavaScript?

Let’s say the following is our array of objects with duplicates −

var studentDetails=[
   {studentId:101},
   {studentId:104},
   {studentId:106},
   {studentId:104},
   {studentId:110},
   {studentId:106},
]

Use the concept of set to remove duplicates as in the below code −

Example

var studentDetails=[
   {studentId:101},
   {studentId:104},
   {studentId:106},
   {studentId:104},
   {studentId:110},
   {studentId:106},
]
const distinctValues = new Set
const withoutDuplicate = []
for (const tempObj of studentDetails) {
   if (!distinctValues.has(tempObj.studentId)) {
      distinctValues.add(tempObj.studentId)
      withoutDuplicate.push(tempObj)
   }
}
console.log(withoutDuplicate);

To run the above program, you need to use the following command −

node fileName.js.

Output

Here, my file name is demo158.js. This will produce the following output −

PS C:\Users\Amit\JavaScript-code> node demo158.js
[
   { studentId: 101 },
   { studentId: 104 },
   { studentId: 106 },
   { studentId: 110 }
]

AmitDiwan

Updated on: 12-Sep-2020

163 Views

Kickstart Your Career

Get certified by completing the course

Get Started