Syntax error How to remove some items from array when there is repetition in JavaScript

How to remove some items from array when there is repetition in JavaScript

We are required to write a JavaScript function that takes in an array of literals. Our function should return a new array with all the triplets filtered.

The code for this will be −

const arr1 = [1,1,1,3,3,5];
const arr2 = [1,1,1,1,3,3,5];
const arr3 = [1,1,1,3,3,3];
const arr4 = [1,1,1,1,3,3,3,5,5,5,5,5,5,5,5,5,5,5,5,7,7];
const removeTriplets = arr => {
   const hashMap = arr => arr.reduce((acc, val) => {
      if(val in acc){
         acc[val]++;
      }else{
         acc[val] = 1;
      };
      return acc;
   }, {});
   let res = [];
   let obj = hashMap(arr);
   for(let key in obj){
      for(let i = 0; i < obj[key] % 3; i++){
         res.push(key)
      };
   }
   return res;
}

console.log(removeTriplets(arr1));
console.log(removeTriplets(arr2));
console.log(removeTriplets(arr3));
console.log(removeTriplets(arr4));

The output in the console −

[ '3', '3', '5' ]
[ '1', '3', '3', '5' ]
[]
[ '1', '7', '7' ]
Updated on: 2020-10-09T12:20:45+05:30

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