Q: Count unique words in array

Solution 1

const input = ["you", "me", "them", "them", "me", "them"];

const getUniqueWordsInArray = (inputArray) => {
    return [...new Set(inputArray)].length;
};

getUniqueWordsInArray(input); // 3

Big O -> O(n)

Solution 2

const input = ["you", "me", "them", "them", "me", "them"];

const getUniqueWordsInArray = (inputArray) => {
    const resultsMap = {};

    inputArray.forEach((word) => {
        resultsMap[word] = true;
    });

    return Object.keys(resultsMap).length;
};

getUniqueWordsInArray(input); //3

Big O -> O(2n) -> O(n)