I have a unique situation in my Angular project where I have stored an array of data points in the local storage.
To handle this data, I have created a custom class as follows:
export class Datapoint {
id: number;
name: string;
// ... additional properties.
constructor(){
}
public getDescription() {
// ... implementation
}
// ... more methods
}
Now, when retrieving the array from local storage, I parse it back from a string.
const dpList = JSON.parse(localStorage.getItem('datapoints'));
Since 'dpList' is initially of type 'Object', I perform a type assertion to convert it to my desired type 'Datapoint'.
const datapoints: Datapoint[] = [];
public someFunction(): Datapoint[] {
// Retrieving the stringified objects from local storage
const dpList = JSON.parse(localStorage.getItem('datapoints'));
// Iterating through the array and pushing each element to this.datapoints
dpList.forEach(dp => {
const asserted_dp: Datapoint = (dp as Datapoint);
this.datapoints.push(asserted_dp);
});
}
However, after the type assertion, 'asserted_dp' seems to be recognized as type Object rather than Datapoint. This prevents me from accessing the designated functions of type Datapoint since the proto property does not contain such information.
If anyone has a solution on how to properly execute the type assertion, I would greatly appreciate your advice!
Thank you in advance!