ejemplo.js

function getMaxMin(array) {
    let min
    let max = Number.MIN_VALUE

    if (array.length > 0) {
        min = Math.min(array[0], array[array.length - 1])
    }

    return { max: getMax(array, max), min: min }

}

function getMax(array, max) {
    if (array.length <= 1) {
        return Math.max(array[0], max)
    }

    let initial = array.slice(0, Math.floor(array.length / 2))
    let rest = array.slice(Math.ceil(array.length / 2))

    if (rest[0] > max) {
        return getMax(rest, rest[0])
    }
    else {
        return getMax(initial, max)
    }
}


getMax([1, 2, 4, 4, 5], 4)