Why does Angular throw a length-related error, while I am able to retrieve the length using console log if needed?

It appears that Angular is not receiving the correct data type it expects, yet the lack of errors in the terminal is puzzling. However, the console output states:

https://i.stack.imgur.com/1xPsg.jpg

If the length property can be detected (highlighted in the image), why does it claim otherwise?

import { Component, OnInit } from '@angular/core'; 
import { ClientService } from '../../services/client.service';
import { Client } from '../../models/Client';

@Component({
  selector: 'app-clients',
  templateUrl: './clients.component.html',
  styleUrls: ['./clients.component.css']
})
export class ClientsComponent implements OnInit { 
clients!: Client[];
totalOwed!: number;


  constructor(private clientService: ClientService) { }

  ngOnInit() {
    this.clientService.getClients()
    .subscribe(clients => {
        /* console.log(clients), reveals all clients in Firestore
           and we can also console.log the length here as 3 */
        console.log(clients.length);
        this.clients = clients;
        this.getTotalOwed();
      });
  }
}

Updated Question Details: It seems like I'm trying to access the length property within the template html section. How can this issue be resolved?

<!-- clients-component-html -->
<div class="row">
  <div class="col-md-6">
    <h2><i class = "fa fa-users"></i>Clients</h2>
  </div>
  <div class="col-md-6">
    <h5 class="text-right text-secondary">Total Owed: {{totalOwed | currency: "USD": "symbol"}}  </h5>
  </div>
</div>
<table *ngIf="clients.length > 0; else noClients" class="table table-striped">
  <thead class="thead-inverse">
    <tr>
      <th>Name</th>
      <th>Email</th>
      <th>Balance</th>
      <th> </th>

    </tr>
  </thead>
  <tbody>
    <tr *ngFor="let client of clients">
      <td>{{ client.firstName }}  {{ client.lastName }}</td>
      <td>{{ client.email }}</td>
      <td>{{ client.balance | currency: "USD": "symbol"}}</td>
      <td>
        <a
          routerLink="client/{{ client.id }}" class="btn btn-secondary btn-sm">
          <i class="fa fa-arrow-circle-o-right"></i>
            Details
        </a>
      </td>
    </tr>
  </tbody>
</table>

<ng-template #noClients>
  <hr>
  <h5>There are no clients in the system</h5>
</ng-template>

Answer №1

It appears that you are trying to access the variable.length in the template before it has been set.

To resolve this issue, consider using an ngIf or variable?.length in the template instead.

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