What is a way to merge all the letters from every console.log result together?

Question

What is a way to merge all the letters from every console.log result together?

I'm encountering an issue - I've been attempting to retrieve a string that provides a link to the current user's profile picture. However, when I use console.log(), the output appears as follows:

Console Output:

https://i.sstatic.net/70W6Q.png

Below is my TypeScript code along with the console.log output:

userImageURL$: Observable<string>;

constructor(
  private userService: UserService
) {}

ngOnInit() {
  this.userImageURL$ = this.user$.pipe(
    switchMap((user: User) => this.userService.getImageURL(user.uid))
  );

  this.userImageURL$.subscribe((test) => console.log(test));
}

The getImageURL() function within the UserService is designed to return a string representing the current user's profile picture.

How can I properly combine these components into a single string?

javascript angular typescript rxjs

Answer 1

Answer №1

Combine all the characters within the handler function and output the resulting string after the image has completed loading.

var finalString = '';
this.userImageURL$.subscribe((text) => finalString = finalString + text);

var delayInMilliseconds = 500;
setTimeout(function() {
    console.log(finalString);
}, delayInMilliseconds);

Answer 2

Combine all the characters within the handler function and output the resulting string after the image has completed loading.

var finalString = '';
this.userImageURL$.subscribe((text) => finalString = finalString + text);

var delayInMilliseconds = 500;
setTimeout(function() {
    console.log(finalString);
}, delayInMilliseconds);

Answer 3

Answer №2

To display the complete string, concatenate all the characters together.

let fullString = '';
this.userImageURL$.subscribe(
   char => fullString += char,
   err => console.error(err),
   () => console.log(fullString) // when done
);

Answer 4

To display the complete string, concatenate all the characters together.

let fullString = '';
this.userImageURL$.subscribe(
   char => fullString += char,
   err => console.error(err),
   () => console.log(fullString) // when done
);

Answer 5

Answer №3

It appears there may be a problem with the function

this.userService.getImageURL(user.uid)

. It seems to return an observable that emits individual values (characters in a string).

There are two ways we can address this issue:

1) Utilize the scan operator from the rxjs library:

this.userImageURL$ = this.user$.pipe(
    switchMap((user: User) => this.userService.getImageURL(user.uid)),
    scan((accumulator, char) => {
            accumulator += char;
            return accumulator;
         }, '')
  )

2) Verify that

this.userService.getImageURL(user.uid)

returns the entire string:

const url$ = this.userService.getImageURL(user.uid).pipe(
    tap(console.log)
);
url$.subscribe(dataChar => console.log(`The data entry is: ${dataChar}`));

If the output logged in both tap and subscribe matches, then option #2 is erroneous.

Answer 6

It appears there may be a problem with the function

this.userService.getImageURL(user.uid)

. It seems to return an observable that emits individual values (characters in a string).

There are two ways we can address this issue:

1) Utilize the scan operator from the rxjs library:

this.userImageURL$ = this.user$.pipe(
    switchMap((user: User) => this.userService.getImageURL(user.uid)),
    scan((accumulator, char) => {
            accumulator += char;
            return accumulator;
         }, '')
  )

2) Verify that

this.userService.getImageURL(user.uid)

returns the entire string:

const url$ = this.userService.getImageURL(user.uid).pipe(
    tap(console.log)
);
url$.subscribe(dataChar => console.log(`The data entry is: ${dataChar}`));

If the output logged in both tap and subscribe matches, then option #2 is erroneous.

What is a way to merge all the letters from every console.log result together?

Answer №1

Answer №2

Answer №3

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