I have a function like this:
private data: MyCustomDataObject;
private getData(): boolean {
let val: boolean = true; // variable declared
this.service.callMethod().subscribe(data => {
this.data = data;
if (data == null) {
val = false; // val declared above is not updating
}
});
return val; // this is still true, should be false
}
How come val isn't updating?
What's happening here is that subscribe takes the function you give it, and hangs onto it for later, when some event happens. It doesn't actually run your function when you pass it. Because of this, the getData function moves on without your callback ever being called, so the value of val never changes before getData returns. If you want it to return false, you'll need to change val outside of the callback that you pass to subscribe.
val? (orgetData)?subscribeasynchronous? If so,getDatais returning before the function you pass tosubscribeever runsgetDatais called from another method in the same class, andvalis used in that same method that callsgetDatasubscribeis just a callback for when something changes. Am I right in guessing that?