SOURCE

function Stack() {
    let items = [];

    this.push = function(element) {
        items.push(element);
    }
    this.pop = function() {
        return items.pop();
    }
    this.peek = function() {
        return items[items.length - 1];
    }
    this.isEmpty = function() {
        return items.length === 0;
    }
    this.size = function() {
        return items.length;
    }
    this.printStack = function() {
        console.log(items.toString());
    }
}

function tenSwitchAny(x, base) {
    let remStack = new Stack(),
        resultString = '',
        referString = '0123456789ABCDEF';

    while(x > 0) {
        remStack.push(x % base);
        x = Math.floor(x / base);
    }

    while(!remStack.isEmpty()) {
        resultString += referString[remStack.pop()];
    }

    return resultString;
}