Removing duplicate objects from array in JavaScript

JavascriptWeb DevelopmentFront End TechnologyObject Oriented Programming

Suppose, we have an array of objects like this −

const arr = [
   {"title": "Assistant"},
   {"month": "July"},
   {"event": "Holiday"},
   {"title": "Assistant"}
];

We are required to write a JavaScript function that takes in one such array. Our function should then return a new array that contains all the object from the original array but the duplicate ones.

Example

The code for this will be −

const arr = [
   {"title": "Assistant"},
   {"month": "July"},
   {"event": "Holiday"},
   {"title": "Assistant"}
];
const removeDuplicate = arr => {
   const map = {};
   for(let i = 0; i < arr.length; ){
      const str = JSON.stringify(arr[i]);
      if(map.hasOwnProperty(str)){
         arr.splice(i, 1);
         continue;
      };
      map[str] = true;
      i++;
   };
};
removeDuplicate(arr);
console.log(arr);

Output

The output in the console −

[ { title: 'Assistant' }, { month: 'July' }, { event: 'Holiday' } ]
raja
Published on 12-Oct-2020 14:49:52
Advertisements