js array 去重复

const array = [1, 2, 3, 2, 4, 1];
const uniqueArray = [...new Set(array)];
console.log(uniqueArray); // [1, 2, 3, 4]

const array = [1, 2, 3, 2, 4, 1];
const uniqueArray = array.filter((item, index) => array.indexOf(item) === index);
console.log(uniqueArray); // [1, 2, 3, 4]

const array = [1, 2, 3, 2, 4, 1];
const uniqueArray = array.reduce((accumulator, currentValue) => {
  if (!accumulator.includes(currentValue)) {
    accumulator.push(currentValue);
  }
  return accumulator;
}, []);
console.log(uniqueArray); // [1, 2, 3, 4]

const array = [1, 2, 3, 2, 4, 1];
const uniqueArray = Object.keys(array.reduce((accumulator, currentValue) => {
  accumulator[currentValue] = true;
  return accumulator;
}, {})).map(Number);
console.log(uniqueArray); // [1, 2, 3, 4]