One of the Most frequently asked javascript DS Algo Question Remove Duplicate from sorted Array in Technical Round. We Can Solve this problem in a different way such as by using Object Method and many more methods, we can see below all the methods...

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There are some test cases, which helps us to understand the question:-

// first test case
input = [1,1,2]
   output = [1,2]

// second test case 
 input = [1,2,2,3,4,4,45,88,88]
    output = [1,2,3,4,45,88]

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1. Remove duplicate by using the inbuilt method

=> In this method, we are using the spread method and also the new Set method.

let arr = [1, 1, 3, 3, 5];

let remove_duplicates= [...new Set(arr)];
console.log(remove_duplicates)

// OUTPUT :-
// [1,3,5]

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2. Remove Duplicate by using Object method

=>In this method, We put all the duplicates in the object and lastly push in the new array.

function removeDuplicatefromArray(data) {


  let n = data.length;

  let result = [];
  if (n == 0 || n == 1) {
    return n;
  }
  let obj = {};

  for (let i = 0; i < n; i++) {
    if (!obj[data[i]]) {
      obj[data[i]] = true;
      result.push(data[i]);
    }
  }
  return result;
}

let arr = [4,5,8,8,8,9,9,12,55,88,99,99,101]

let final = removeDuplicatefromArray(arr)
console.log(final);