Many template languages have "slots" or "yield" statements, that allow to do some sort of inversion of control to wrap one template inside of another.  Angular has "transclude" option.  Rails has yield statement. If React.js h...
Good [your_time_of_day],  Today I have been learning about composition and factory functions in javascript (es6). I understand that composition should be preferred over inheritance and have come to agree with that (at least in javascript). Then, I re...
Recently I read about function composition in a Javascript book, and then on a website I saw someone reference it as currying.  Are they the same concept?...
I’m trying to make a tabs component. TabsSwitcher and TabsPanel must be separate components so they could be used anywhere in DOM, e.g. TabsSwitcher doesn’t have to be followed by TabsPanel.  To make it work, I need to somehow connect these compo...
I got some trouble with compostions and mixin. For examples, lets imagine that we have a AHero and Hero1 object. All heroes can move, so AHero.move() is a thing. And now, at a moment of the dev, I want to add the possibility to stun and beStunned. So...
Is it possible to extend only some specific part from multiple classes? Example:    class Walker {   walk() {     console.log("I am walking");   }   // more functions } class Runner {   run() {     console.log("I am running");   }   /...
There is a lot of information about composition vs inheritance online, but I haven't found decent examples with JavaScript. Using the below code to demonstrate inheritance:  function Stock( /* object with stock names and prices */ ) {     for (va...
I have been reading about the different ways to do OOP in JS.   Douglas Crockford has an interesting approach in which he doesn't appear to use delegation at all. Instead, to me it appears that he purely utilizes object concatenation as his inher...
As part of an RPG game back-end, I want to be able to apply temporary effects to the characters. The nature of these effects could vary quite a lot, but I want to keep the method of defining them very straightforward.  I'm using custom event hand...
Function composition composes from right to left:  const comp  = f => g => x => f(g(x)); const inc = x => x + 1; const dec = x => x - 1; const sqr = x => x * x; let seq = comp(dec)(comp(sqr)(inc));  seq(2); // 8   seq(2) is transfor...

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