Why does `Dir[directory_path].empty?` return `false` all the time?

Why does `Dir[directory_path].empty?` return `false` all the time?

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Why does `Dir[directory_path].empty?` return `false` all the time?
Tag : ruby , By : Manu
Date : November 26 2020, 01:01 AM

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is there a function that return false on 0 or other things but true on false,null, empty array()?

Tag : php , By : user149634
Date : March 29 2020, 07:55 AM
wish of those help I think the simplest way would be (!$var and $var!=0), but is there a way to do it without repeating the var name?
function foo($var)
    return ($var === false || $var === null || is_array($var));


Return true false or some data When Time falls in Time Range in a chain of Time Ranges?

Tag : chash , By : Mare Astra
Date : March 29 2020, 07:55 AM
hop of those help? Your question is not very clear to understand, but I hope this helps helps you:
//1) I want this class to be able to hold not just a true/false status, but a generic type T, so that it can return more data...
//2) If on the way it's possible to write it in a way that it would run faster and/or facilitate easier data entry.

class Program {
    static void Main(string[] args) {
        TimeSpan t1 = new TimeSpan(8, 48, 0);
        TimeSpan t2 = new TimeSpan(9, 56, 0);
        TimeSpan t3 = new TimeSpan(10, 5, 0);
        TimeSpan t4 = new TimeSpan(13, 30, 0);
        TO<bool> TO = new TO<bool>(t1, true) {
            new TO<bool>(t2, false) {
                new TO<bool> (t3, true) {
                    new TO<bool>(t4, false)
        Console.WriteLine("The time now is considered " + TO.OkNok(DateTime.Now));

public class TO<T> : IEnumerable<TO<T>> {
    public TimeSpan Ti;
    public T Ok;
    public TO<T> NT;

    public TO(TimeSpan timeSpan, T ok) {
        this.Ti = timeSpan;
        this.Ok = ok;

    public T OkNok(DateTime Time) {
        return OkNok(Time.TimeOfDay);

    public T OkNok(TimeSpan currentTime) {
        if(NT == null) {
            return Ok;
        if(currentTime > Ti && currentTime <= NT.Ti) {
            return Ok;
        return NT.OkNok(currentTime);

    public void Add(TO<T> nt) {
        this.NT = nt;

    IEnumerator<TO<T>> IEnumerable<TO<T>>.GetEnumerator() {
        yield return this;
        if(NT != null) {
            yield return NT;

    System.Collections.IEnumerator System.Collections.IEnumerable.GetEnumerator() {
        yield return this;
        if(NT != null) {
            yield return NT;

I want to return a value of true or false but force it to randomly return false 3% of the time

Tag : java , By : dummyadresse
Date : March 29 2020, 07:55 AM
should help you out Check out Math.random(), which gives you a random number [0,1). You want false 3/100 times, so if you multiply your random number by 100, your range will become [0, 100). Then just check if the random number is less than 3, if so, return false.

empty function return false when it should return true codeigniter

Tag : php , By : vitorcoliveira
Date : March 29 2020, 07:55 AM
it should still fix some issue The problem is that you are filling the array with the details they have entered, even if they do not enter any data. The key will be in the array with a blank value, so there will be content in the array...
$data_pos = array(
    'telephone' => $this->input->post('phone_pos'),
    'address' => $this->input->post('address_pos'),
    'details' => $this->input->post('details'),
if(empty($data_pos) == false){
$data_pos = array(
    'telephone' => $this->input->post('phone_pos'),
    'address' => $this->input->post('address_pos'),
    'details' => $this->input->post('details'),
$data_pos = array_filter($data_pos);
if(empty($data_pos) == false){

Why does `and` return True for empty foldable but `or` return False in Haskell?

Tag : haskell , By : sadboy
Date : March 29 2020, 07:55 AM
wish helps you To expand on the answer by Dan, the conjunction of an empty list of truth values being true True allows you to extend the expected properties of conjunction to that case.
For instance, we would expect that,
and (xs ++ ys) = (and xs) && (and ys) 
  and xs 
= and (xs ++ [])
= (and xs) && (and []) 
True  = True  && (and [])
False = False && (and [])
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