javascript remove duplicate in two arrays

// 1. filter()
function removeDuplicates(array) {
  return array.filter((a, b) => array.indexOf(a) === b)
};
// 2. forEach()
function removeDuplicates(array) {
  let x = {};
  array.forEach(function(i) {
    if(!x[i]) {
      x[i] = true
    }
  })
  return Object.keys(x)
};
// 3. Set
function removeDuplicates(array) {
  array.splice(0, array.length, ...(new Set(array)))
};
// 4. map()
function removeDuplicates(array) {
  let a = []
  array.map(x => 
    if(!a.includes(x) {
      a.push(x)
    })
  return a
};
/THIS SITE/ "https://dev.to/mshin1995/back-to-basics-removing-duplicates-from-an-array-55he#comments"

3.2
5
Jingya 100 points

                                    // for TypeScript and JavaScript
const initialArray = ['a', 'a', 'b',]
finalArray = Array.from(new Set(initialArray)); // a, b

3.2 (5 Votes)
0
4
7

                                    array1 = array1.filter(function(val) {
  return array2.indexOf(val) == -1;
});
// Or, with the availability of ES6:

array1 = array1.filter(val => !array2.includes(val));

4 (7 Votes)
0
3
1
Gentiana 95 points

                                    uniqueArray = a.filter(function(item, pos) {
    return a.indexOf(item) == pos;
})

3 (1 Votes)
0
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