SOURCE

function fn(input, k)
{
    // write code here
    if (k > input.length) {
        return []
    }
    let newArr = input.splice(0, k)
    console.log(newArr)
    console.log(input)
    for(let i = 0; i < input.length; i++) {
        let big = Math.max(...newArr)
        console.log('big', big)
        if (input[i] < big) {
            const index = newArr.indexOf(big)
            newArr.splice(index,1,input[i])
        }
    }
    return newArr.sort()
}

console.log(
    fn([4,5,1,6,2,7,3,8],4)
)