javascript – Unit testing multiple features in one test

I’m writing a small utility class to create an abstraction for addEventListener (JavaScript/DOM)

Let’s say I have to test for these features:

  1. Single event target with a single event
  2. Multiple events
  3. Multiple event targets
  4. Delegated events
  5. Once

Now if I understand unit testing properly, I should create a test for each feature.

However, is there a need to test combined features? E.g.

  1. Multiple events + multiple targets
  2. Multiple event targets + delegated events
  3. Multiple event targets + delegated events + multiple events

Should I implement those combined tests in addition to single feature tests, or should I believe that I am fully covered by the single feature tests?

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c++11 – A FIR filter using Modern C++ features

I’m diving into “modern CPP”, with wide usage of templates and containers,
So I started with FIR filter.

In signal processing, a finite impulse response (FIR) filter is a filter whose impulse response (or response to any finite length input) is of finite duration, because it settles to zero in finite time. This is in contrast to infinite impulse response (IIR) filters, which may have internal feedback and may continue to respond indefinitely (usually decaying).

So I define FIR filter as a class and apply it to single scalar value or to the vector itself

Could you please review my code in terms of C++ coding?

#include <iostream>
#include <vector>
#include <list>
#include <algorithm>
#include <complex>
#include <cmath>
#include <iomanip>
#include <sstream>

// - Class method : operator(), constructor, various methods
// - Templates class and function
// - List and vector containers
// - Functors

template <typename T> std::string to_str(T & arr){
  std::ostringstream os;
  os << "(";  for (auto x: arr){    os<<" "<< x <<" ";  }  os << ")n"; 
  return os.str();

template <class T> class FIR { 
    std::vector< T > coeff;  // Array of coefficents is static all the time
    std::list< T > taps;  // Array of is are shifting each tick
    int order;

    FIR(std::vector< T > v)  
       coeff = v; 
       order = coeff.size();
       taps = std::list< T > (coeff.size(), 0);
    void reset(){
       taps = std::list< T > (coeff.size(), 0);
    void append( T  x){
      taps.push_front( x);

    auto sum_product(){
      T  psum = 0;
      typename   std::list< T >::iterator t;
      typename std::vector< T >::iterator c;
      // Can we do better here?
      for (   c =coeff.begin(),     t  =taps.begin(); 
              c!=coeff.end(),       t !=taps.end();
            ++c             ,     ++t             ){
        psum += (*c) * (*t);
      return psum;
    auto operator() ( T  x){
       T  psum = sum_product();
      return psum;

     auto operator() (std::vector< T > x){
     std::vector< T > y( x.size(), 0);
     for (int i = 0; i<x.size(); ++i){
        y(i) =  operator()(x(i));
     return y;
int main() 
    std::vector<double> coeff = {0.0,1.0,5.0, 1.0, 0.0};
    FIR<double> fir(coeff); 
    std::cout <<"Coeff: " << to_str(fir.coeff);
    std::cout <<"Taps : "  << to_str(fir.taps);
    std::cout<<"nTRANSFORM IN THE LOOP n";
    std::vector<double> x_array = {0,1,2,3,4,5,6,0,0,0,0,0,0,13};
    for (auto x:x_array){
      auto p = fir(x);
      std::cout<<p<<"  ";

    std::vector<double> y_array( x_array.size(), 0);
    std::transform(x_array.begin(), x_array.end(), y_array.begin(), fir); 
    std::cout << to_str(y_array);

    auto y_2 = fir(x_array);
    std::cout << to_str(y_2);

    return 0; 

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Types, Features, And Our Hands-on Experience

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dnd 5e – For a multiclassed Ancestral Guardians barbarian/Echo Knight fighter, how do the Ancestral Protectors and Manifest Echo features interact?

Let’s say I have three levels in Barbarian and three in Fighter.

As a barbarian, I choose the Path of the Ancestral Guardian subclass, so I gain the Ancestral Protectors feature (XGtE, p. 10):

While you’re raging, the first creature you hit with an attack on your turn becomes the target of the warriors, which hinder its attacks. Until the start of your next turn, that target has disadvantage on any attack roll that isn’t against you, and when the target hits a creature other than you with an attack, that creature has resistance to the damage of the target’s attacks.

I also choose to be an Echo Knight as my Fighter subclass. The second bullet of the Manifest Echo feature says (EGtW, p. 183):

When you take the Attack action on your turn, any attack you make with that action can originate from your space or the echo’s space. You make this choice for each attack.

How do the Ancestral Protectors and Manifest Echo features interact?

If my first attack originates from the echo’s space (i.e. the echo attacks), would the Ancestral Protectors encourage the enemy to attack the echo (i.e. by hindering attacks against targets other than the echo), or to attack my character (as normal for Ancestral Protectors)?

If it encourages the enemy to attack the echo, does the effect remain even after it is dispersed, so the baddy still attacks other targets with disadvantage?

Or does it just encourage the enemy to attack me, as usual? (In that case, I can basically use the echo to make me a super-annoying ranged tank that forces enemies to choose between trying to chase me down, and attacking a target other than me with both disadvantage on the attack and resistance to the damage for the target.)

dnd 5e – What happens to your class features if you short rest while your form has been changed?

Rules Do What They Say

Unless overridden by another rule (specific beats general), spells and features do exactly what they say.

With Polymorph, You Don’t Have The Feature

The Polymorph spell description contains the line:

The target’s game statistics, including mental ability scores, are replaced by the statistics of the chosen beast.

Class features are part of your statistics. Which means that at the time of the rest you don’t have the Pact Magic feature. So despite having rested, while you rested you didn’t have the feature that allows the slot to recharge.

Shapechange and Wild Shape Keep Class Features

Both the spell shapechange and the druid class feature Wild Shape contain the language:

Your game statistics are replaced by the statistics of the chosen creature, though you retain your alignment and Intelligence, Wisdom, and Charisma scores You also retain all of your skill and saving throw proficiencies (…)

You retain the benefit of any features from your class, race, or other source and can use them, provided that your new form is physically capable of doing so.

So, you’d be able to recharge your spell slots while shapechanged or Wild Shaped. Note that the “You retain” is an exception to the normal state of having your statistics replaced.

python – How to find correlation between numerical and non numerical features

I have car’s data. It includes features that have numeric values such as price, mileage, engine, horsepower etc and non-numeric values such as brand, facelift etc. I am able to easily find correlation between numerical values using this:

corr = sdf.corr(method="spearman")'coolwarm')

What are the different techniques to find correlation between other data types? I want to see affect of brand on price and other non numerical features on price.

Forum Upgrades and New Features, Bugs?

Hi guys,

We started updating forum and adding new features, as soon as e finish will let you know.

Meanwhile let me know if you see any bugs, broken links, broken pages etc…

BMF Staff

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