Does adding elements to an array prevent it from being sortable?

Why isn't my array sorting in my typescript code (angular component) after being populated? When I manually populate the array it sorts correctly. What could be causing this issue?

Example of working code:

let chartArr: any = [];

chartArr = [
  {text: 'AA', assignedTasks: 3},
  {text: 'BB', assignedTasks: 7},
  {text: 'CC', assignedTasks: 1},
  {text: 'DD', assignedTasks: 10},
];

console.log(this.chartArr.sort((a, b) => b.assignedTasks - a.assignedTasks ));

Example of code that doesn't work:

let chartArr: any = [];

 doc.forEach(user => {
        eventTasksRefCount = this.afs.collection('eventTask', ref => ref.where('uid', '==', user.uid));
        eventTasksObservableCount = eventTasksRefCount.valueChanges();
        eventTasksObservableCount.subscribe(result => {
        this.chartArr.push({text: user.displayName, assignedTasks: result.length });


        });

console.log(this.chartArr.sort((a, b) => b.assignedTasks - a.assignedTasks ));

Answer №1

Ensuring that the array is sorted within your subscribe function is crucial to guarantee that your data is properly formatted for sorting.

For example:

let chartArr: any = [];

 doc.forEach(user => {
        eventTasksRefCount = this.afs.collection('eventTask', ref => ref.where('uid', '==', user.uid));
        eventTasksObservableCount = eventTasksRefCount.valueChanges();
        eventTasksObservableCount.subscribe(result => {
        this.chartArr.push({text: user.displayName, assignedTasks: result.length });
        console.log(this.chartArr.sort((a, b) => b.assignedTasks - a.assignedTasks ));
        });

It's important to note that with this approach, you will constantly sort each time a new result is received, so consider if this aligns with your intended functionality.

Refer to Angular's Observable guide for more insights.

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