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        private int[,] grid;
        public static int DEAD_CELL = 0;
        public static int LIVING_CELL = 1;
        private int rowCount;
        private int columnCount;

        public GameOfLife(int rowCount, int columnCount)
        {
            grid = new int[rowCount, columnCount];
            this.rowCount = grid.GetLength(0);

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https://keathmilligan.net/lazy-loading-content-with-angular-cli/

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# Create Branch 
git checkout feature_branch

# Merge Master into my feature branch 
git merge master

# Add all files and commit them
git add -A  
git commit

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You don't need to use [attr.selected]. 
[(ngModel)]="user.role" is two-way data-binding, 
it will select the matched option from your list if value is equal to user.role. And you can also use basic [value]

<select name="role" [(ngModel)]="user.role">
    <option *ngFor="let role of roles" [value]="role">{{role.name}}</option>
</select>

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If you don't need two-way data-binding:

<select (change)="onChange($event.target.value)">
    <option *ngFor="let i of devices">{{i}}</option>
</select>

onChange(deviceValue) {
    console.log(deviceValue);
}
For two-way data-binding, separate the event and property bindings:

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<!--
Sometimes, we don’t need a FormGroup, as our form might only consist of a single form control. Think of a search field that let’s you search for products in an e-commerce application. Technically, we don’t even need a <form> element for that.
Angular comes with a directive formControl which doesn’t have to be inside a formGroup. We can simply add it to a single form control and are ready to go:
-->

<!-- no surrounding form -->
<input type="search" [formControl]="seachControl">

<!--
The cool thing about form controls in Angular is, 

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/*
JavaScript classes are introduced in ECMAScript 6 and are syntactical sugar over JavaScript's existing prototype-based inheritance. 
The class syntax is not introducing a new object-oriented inheritance model to JavaScript. JavaScript classes provide a much simpler and clearer 
syntax to create objects and deal with inheritance.
*/

var Users = class {
  constructor(fullName, description) {
      this.fullName = fullName;
      this.description = description;

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var users = [];

users['john'] = { id: 'john01', role: 'admin' };
users['bob'] = { id: 'bob01', role: 'reader' };

console.log(users);
console.log(users['bob']);
console.log(Object.keys(users).length)

/*

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var users = {}

users = {
    "john": { id: 'john01', role: 'admin' },
    "bob": { id: 'bob01', role: 'reader' },
}
users["steeve"] = { id: 'steeve01', role: 'admin' };

console.log(users);
console.log(users['bob']);

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The introduction to Reactive Programming you've been missing

(by @andrestaltz)

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This tutorial as a series of videos

If you prefer to watch video tutorials with live-coding, then check out this series I recorded with the same contents as in this article: Egghead.io - Introduction to Reactive Programming.

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