title: Angular 9, Binding an array as an @Input for child component is not working
body: <p>For some reason, the array is not passed to the child components. What I'm missing? </p>
  
  <p>My child component: 
  .html</p>
  
  <pre><code>&lt;ul&gt;
      &lt;li *ngFor="let item of items"&gt;
          &lt;a (click)="itemHasBeenClicked(item)"&gt;{{item}}&lt;/a&gt;
      &lt;/li&gt; 
  &lt;ul&gt;
  </code></pre>
  
  <p>.ts</p>
  
  <pre><code>import { Component, OnInit, Input, Output, EventEmitter } from '@angular/core';
  
  
  @Component({
    selector: 'app-three-dots-menu',
    templateUrl: './three-dots-menu.component.html',
    styleUrls: ['./three-dots-menu.component.sass']
  })
  export class ThreeDotsMenuComponent implements OnInit {
  
    constructor() { }
  
    @Input()
    public itemsList : string[];
  
    ngOnInit(): void {
  
    }
  
    @Output()
    itemClicked: EventEmitter&lt;string&gt; = new EventEmitter&lt;string&gt;();
  
    itemHasBeenClicked(item)
    {
      alert(item);
      this.itemClicked.emit(item);
    }
  }
  </code></pre>
  
  <p>parent component: 
  .html</p>
  
  <pre><code>&lt;app-three-dots-menu  [itemsList]="menuItems"&gt;&lt;/app-three-dots-menu&gt;
  </code></pre>
  
  <p>.ts</p>
  
  <pre><code>import { Component, OnInit } from '@angular/core';
  @Component({
    selector: 'app-users-table',
    templateUrl: './users-table.component.html',
    styleUrls: ['./users-table.component.sass']
  })
  export class UsersTableComponent implements OnInit {
  
    constructor() { }
    menuItems : string[] = ['New User', 'Refresh'];
  
    ngOnInit(): void {  
  
    }
  
  
  
  }
  </code></pre>
  
  <p>if I initialize the itemsList of the child component (ThreeDotsMenuComponent) in the ngOnInit it works and shows properly. 
  any other option is not working, include this line </p>
  
  <pre><code>@Input()
    public itemsList : ["item1","Item2"];
  </code></pre>
  
  <p>I'm sure I'm missing a small thing somewhere, I already followed many instructions and read many posts here and in other forums, and still stuck. </p>