couple of toy fn's

oddOccurences.js

function oddOccurences(arr) {
    let odds = [];
    let previous;
    let count = 0;
    for (let i = 0; i < arr.length; i++) {
        let current = arr[i];
        if (!previous) {
            previous = current;
        }

        if (previous === current) {
            count++;
        } else {
            if (count % 2 !== 0) {
                odds.push(previous);
            }
            count = 1
        }
        
        previous = current;
    }

    return odds;
}

console.log(oddOccurences([1,2,2,2,2,3,3,3,4,5,5]))

reverse.js

function reverseCheating(str) {
  return str.split('').reverse().join('')
}

console.log(reverseCheating('testing123'))


function reverse(str) {
    let arr = str.split('');
    let reversed = ''
    for (let i = arr.length; i > 0; i--) {
        reversed += arr[i-1];
    }

    return reversed
}

console.log(reverse('testing123'));