02. Odd Occurrences Associative Arrays

function oddOccurences(input) {
    let words = input.split(' ').map(a => a.toLowerCase());
    let extracted = [];

    for (let word of words) {
        if (countOdd(words, word)) {
            extracted.push(word);
        }
    }
    extracted = [...new Set(extracted)];
    console.log(extracted.join(' '));

    function countOdd(array, value) {
        var n = 0;
        for (i = 0; i < array.length; i++) {
            if (array[i] == value) { n++ }
        }
        return n % 2 === 1;
    }
}