8:00 – 2:30 SR

• Alert the media – there are no problems with the production system at all today. no requests, no messages, no nothing.
• Angular. Need to drill down further into the ramifications of declaring functions using the public/private foo = (arg) =>{}; How does this manifest in EcmaScript6? Does this work with a static declaration? What about typing the return value? For that matter, do these methods inherit properly? I’m going to create a inherit5 file and try these things. In a perfect world, this pattern should collapse the problems with Factory and Directive.
  • EcmaScript 6: The Mozilla Developer Network discusses fat arrows here. The part about ‘lexical this is worth paraphrasing here:
    • Until arrow functions, every new function defined its own this value (a new object in case of a constructor, undefined in strict mode function calls, the context object if the function is called as an “object method”, etc.). This proved to be annoying with an object-oriented style of programming. In ECMAScript 3/5, this issue was fixed by assigning the value in this (e.g. self) to a variable that could be closed over. Arrow functions capture the this value of the enclosing context, so the following code works as expected.
      

function Person(){
  this.age = 0;

  setInterval(() => {
    this.age++; // |this| properly refers to the person object
  }, 1000);
}

var p = new Person();

• So, according to this and as long as the proposal doesn’t change too much, I think we’re on stable ground
• Set up Inherit5.html and Inherit5.ts. Pretty much everything works in the ‘best case’ way. The only issue is that Factories and Directives require a function that returns a directive for their initialization. The way to deal with that is to still have the ctor() method, but have it called differently:

• new AngularMain().doCreate(angular, new InheritApp.TestFactory().ctor,...);

• This creates an instance (with a this! Yay!), but still allows the angular code to create the directive its way. The full code is here:
  • inherit5.html
  • inherit5.ts
  • inherit5.js
• 3:00 meeting in Hanover.
• 4:30 class