Hello guys, hope you can help me with this. I have a function that deletes an element of a list, som...

# getting-started

[Antonio Acuña Prieto]

Hello guys, hope you can help me with this. I have a function that deletes an element of a list, something like:

fun delete(id: UUID) = list.removeIf { it -> it.id == id }

And I want to:
• If the element was removed, don’t return nothing.
• If the element was not found, return exception
For now I have something like:

fun delete(id: UUID) = takeIf { list.removeIf { it -> it.id == id } } ?: throw NotFoundException(id)

But this still returns a true.

[Vampire]

fun delete(id: UUID) = if (list.removeIf { it -> it.id == id }) Unit else throw NotFoundException(id)

[Antonio Acuña Prieto]

Thank you so much, I didn’t know that we can return Unit as a value

[Endre Deak]

or

fun delete(id: UUID) { takeIf { list.removeIf { it -> it.id == id } } ?: throw NotFoundException(id) }

[phldavies]

why not

fun delete(id: UUID) { 
    if (!list.removeIf { it.id == id }) throw NotFoundException(id) 
}

Not sure using takeIf gains you anything here, nor does having both cases on the if to allow for using an expression-body function