In TypeScript, the catch block does not get triggered

I created a custom pipe in Angular that is supposed to format passed parameters to date format. The pipe contains a try-catch block to handle any errors, but surprisingly the catch block never seems to be executed even when an invalid date is passed.

import {PipeTransform, Pipe} from 'angular2/core';

@Pipe({
    name: 'formatDate'
})

export class FormatDatePipe implements PipeTransform {
    transform(value: string): any {
        let formattedDate: string;
        try {
            formattedDate = new Date(value).toLocaleDateString();
        }
        catch (error) {
            return value;
        }
        finally {            
            return formattedDate;
        }        
    }

Why does the catch block fail to execute when an invalid date is passed through the pipe?

Answer №1

When passing an invalid date to the constructor, it may or may not throw an error depending on the input.

For more information, you can reference the following resources: Fall-back to implementation-specific date formats, which leads to this "rough outline of how the parsing works".

If no error is thrown, the constructor will return Invalid Date. To handle this scenario, you can use the following code:

try {
    date = new Date(value).toLocaleDateString();
    if (date === "Invalid Date") {
        throw new Error(`invalid date value ${ value }`);
    }
}

This method ensures that an error is thrown even in cases where no error was initially generated.

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