/**
* 1. new Set() 사용하기
*/
const items = [1, 4, 2, 3, 1, 5];
const uniqArray = array => [...new Set(array)];
console.log(uniqArray(items));
/**
* 2. Array.filter 사용하기
*/
const items = [1, 4, 2, 3, 1, 5];
const uniqArray = array => array.filter((item, index) => array.indexOf(item) >= index);
console.log(uniqArray(items));