rmDuplicates.js

// for big array it is more performant
const removeDuplicates = (array) => {
  const uniqueValues = [];
  const seenMap = {};

  for (const item of array) {
    if (seenMap[item]) continue;
    seenMap[item] = true;
    uniqueValues.push(item);
  }

  return uniqueValues;
};

const rmDuplicates = (array) => {
  // Turn our array into a Set, which can only contain
  // unique values, and then make an array from that set.
  return [...new Set(array)];
};