What could be causing the OnInit lifecycle hook to fail to execute properly?

I'm having trouble with this code. Every time I run it, the console throws a type error saying it can't read property sort. Does anyone have any ideas on how to fix this?

import { Component, OnInit, Input } from '@angular/core';
import { Order } from 'src/app/models/order';

@Component({
  selector: 'app-table',
  templateUrl: './table.component.html',
  styleUrls: ['./table.component.css']
})
export class TableComponent implements OnInit {

  @Input() orders: Order[];

  sortedOrders: Order[];

  constructor() { }

  ngOnInit(): void {
    this.sortedOrders = this.sortOrders(this.orders);
    console.log(this.sortedOrders);
  }

  sortOrders(orders: Order[]): Order[] {
    return orders.sort((a, b) => a.personName.localeCompare(b.personName));
  }

}

Answer №1

In order to properly sort your orders, you should implement the ngAfterViewInit lifecycle hook in Angular. This hook is triggered after Angular has completed initializing a component's view.

Here is an example of how to use it:

  ngAfterViewInit(): void {
    this.updatedOrders = this.updateOrderList(this.orders);
    console.log(this.updatedOrders);
  }

Answer №2

When utilizing @Input(), keep in mind that your data will not be accessible during the OnInit stage. In this scenario, it would be best to handle the data manipulation within the OnChanges method.

ngOnChanges(): void {
    this.arrangedItems = this.organizeItems(this.items);
    console.log(this.arrangedItems);
  }

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