02. Odd Occurrences (Assoc Arrays)

function solve(input){

    let match = new Array;
    let collection = input.split(' ').map(word=>word.toLowerCase());
    let uniqueSet = Array.from(new Set(collection));

    for (const word of uniqueSet) {
        let matched = collection.filter(item=>item === word);
        if(matched.length % 2 !==0){
            match.push(word);
        }
    }
    console.log(match.join(' '));

}