function medianScore(scores) {
    let result = [];
    let current_arr = [];

    errorHandling(scores)

    for (let index = 0; index < scores.length; index++) {
        for (let j = 0; j <= index; j++) {
            current_arr.push(scores[index]);
            current_arr.sort((a, b) => a - b);
            getMiddleNumber(current_arr, result)
            break;
        }
    }

    return result;
}

console.log(medianScore([100, 20, 50, 70, 45]))

function getMiddleNumber(arr, result) {
    if (arr.length % 2 == 1) {
        let number = Math.ceil(arr[(arr.length - 1) / 2]);
        result.push(number);
    } else {
        let number = Math.ceil((arr[(arr.length / 2)] + arr[(arr.length / 2 - 1)]) / 2);
        result.push(number)
    }
}

function errorHandling(arr) {
    if (arr.length < 1) {
        throw new Error('Please insert any grade');
    }
    if (!(Array.isArray(arr))) {
        throw new Error('Input is not in the correct format')
    }
    if (arr.some(isNaN)) {
        throw new Error('The grades must be only numbers');
    }
}