Combinations JS

var numbersAmount = 5;
console.log("Please enter the amount of the numbers 1...N, N = " + numbersAmount);
var combinationsAmount = 3;
console.log("Please enter the amount of the combinations K = " + combinationsAmount);
var vector = new Array(combinationsAmount);
debugger;
combinations(combinationsAmount - 1, vector, numbersAmount, 1);

function combinations(index, vector, numbersLength, start) {
    if (index == -1) {
        console.log(vector);
    }
    else {
        for (let i = start; i <= numbersLength; i++) {
            vector[index] = i;
            combinations(index - 1, vector, (numbersLength), (i + 1));
        }
    }
}


var arr = "abcde";
var numbersAmount = arr.length;
console.log("Please enter the amount of the numbers 1...N, N = " + numbersAmount);
var combinationsAmount = 3;
console.log("Please enter the amount of the combinations K = " + combinationsAmount);
var vector = new Array(combinationsAmount);
debugger;
combinations(combinationsAmount - 1, vector, numbersAmount, 1);

function combinations(index, vector, numbersLength, start) {
    if (index == -1) {
        console.log(vector);
    }
    else {
        for (let i = start; i <= numbersLength; i++) {
            vector[index] = arr[i-1];
            combinations(index - 1, vector, (numbersLength), (i + 1));
        }
    }
}