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constructor(
    private router: Router,
    private activatedRoute: ActivatedRoute,
    private titleService: Title
  ) {}

  ngOnInit(): void {
    this.router.events
      .filter(event => event instanceof NavigationEnd)
      .map(() => this.activatedRoute)

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This is way is very simple and nice way to display images in Angular.

<img [src]="imageUrl" class="img-responsive" onError="this.src='assets/images/no-image.png';">

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// angular component init lifecycle

ngOnInit() {
  // setup vidyo client
  this.vidyoService.loadVidyoClientLibrary();

  // as a seperate process, calling browser API to get media 
  navigator.getUserMedia({audio: true},
        (stream) => {

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/***
Fake backend router looks like this.

static router(url: string): DBConnection {
    if (url === environment.apiUrl + 'users') {
      return {db: annotators, searchField: '', type: RequestType.Pagination};
    } else if (url.includes(environment.apiUrl + 'corpora')) {
      if (url === environment.apiUrl + 'corpora') {
        return {db: corpora, searchField: 'name', type: RequestType.Pagination};
      } else {

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this.signUpForm.get('email').valueChanges
      .pipe(
        tap(() => this.isInvalidEmail = false),
        debounceTime(500),
        filter(value => CommonService.validateEmail(value)),
        tap((x) => {
          this.isCheckingEmail = true;
          this.isInvalidEmail = false;
        }),
        switchMap(x => this.authService.checkEmail(x)),

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import { Pipe, PipeTransform } from '@angular/core';

/*
 * Convert bytes into largest possible unit.
 * Takes an precision argument that defaults to 2.
 * Usage:
 *   bytes | fileSize:precision
 * Example:
 *   {{ 1024 |  fileSize}}
 *   formats to: 1 KB

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Group Array of JavaScript Objects by Key or Property Value

Implementation

const groupBy = key => array =>
  array.reduce((objectsByKeyValue, obj) => {
    const value = obj[key];
    objectsByKeyValue[value] = (objectsByKeyValue[value] || []).concat(obj);
    return objectsByKeyValue;

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wget -O /tmp/YaHei.Consolas.1.12.zip https://storage.googleapis.com/google-code-archive-downloads/v2/code.google.com/uigroupcode/YaHei.Consolas.1.12.zip
unzip /tmp/YaHei.Consolas.1.12.zip
sudo mkdir -p /usr/share/fonts/consolas
sudo mv YaHei.Consolas.1.12.ttf /usr/share/fonts/consolas/
sudo chmod 644 /usr/share/fonts/consolas/YaHei.Consolas.1.12.ttf
cd /usr/share/fonts/consolas
sudo mkfontscale && sudo mkfontdir && sudo fc-cache -fv

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To remove a submodule you need to:

• Delete the relevant section from the .gitmodules file.
• Stage the .gitmodules changes git add .gitmodules
• Delete the relevant section from .git/config.
• Run git rm --cached path_to_submodule (no trailing slash).
• Run rm -rf .git/modules/path_to_submodule (no trailing slash).
• Commit git commit -m "Removed submodule "
• Delete the now untracked submodule files rm -rf path_to_submodule