Deduplicate Array

deduplicate_array.js

// METHOD 1: reduce/indexOf
//`uniques` contains one of each unique value in `arr`
let arr = ['ant', 0, 'aunt', 'ant'];

let uniques = arr.reduce((acc, curr) => {
  if (acc.indexOf(curr) < 0) {
    acc.push(curr);
  }
  return acc;
}, []);

console.log(uniques); // ['ant', 0, 'aunt']


// METHOD 2: Array.from/new Set
const uniq = a => Array.from(new Set(a));

const dupArr = [0, 1, 0, 2, { a: 'a' }, 1, 'a', 'a', 10, 12, 'ab', 'b'];
console.log(uniq(dupArr)); // [0, 1, 2, { a: 'a' }, 'a', 10, 12, 'ab', 'b']