Remove an Array duplicates

#javascript

Using a Array.forEach

const removeArrayDuplicates = arr => {
  const o = {};
  arr.forEach(item => (o[item] = item));
  return Object.values(o);
};

Using a Array.reduce

const removeArrayDuplicates = arr =>
  Object.values(
    arr.reduce((acc, item) => Object.assign(acc, { [item]: item }), {})
  );

Using Array.filter

const removeArrayDuplicates = arr =>
  arr.filter((item, index) => !arr.slice(0, index).find(e => e === item));

Using Array.reduce, Array.indexOf and Array.concat

const removeArrayDuplicates = arr =>
  arr.reduce(
    (acc, item) => (!~acc.indexOf(item) ? acc.concat([item]) : acc),
    []
  );

Using Array.filter and Array.indexOf

const removeArrayDuplicates = arr =>
  arr.filter((item, index) => arr.indexOf(item) === index);

Using Set and spread

const removeArrayDuplicates = arr => [...new Set(arr)];