Hi all :slightly_smiling_face: How can i use `removePrefix()` if i have this string `Expiration Date...

# getting-started

[LIRAN Y]

Hi all 🙂
How can i use removePrefix()
if i have this string
Expiration Date: "2023-01-03 16:06:52 +0000 UTC"
and i want to get "2023-01-03 16:06:52 +0000 UTC"

[LIRAN Y]

.removePrefix("Expiration Date: ")

i tried this but seems like not working as expected

[corneil]

Are you looking at the original string or the result of removePrefix?

[Joffrey]

This function returns a new modified string, it doesn't mutate the original

[LIRAN Y]

@corneil i am looking at the original string

[corneil]

String is immutable. Thus no method modifies a String directly. The methods returns a new String that is modified accordingly.

[LIRAN Y]

cool 🙂 succeeded with drop(n)

[Joffrey]

But why use drop instead of removePrefix?

[Ömer Faruk Delibaş]

You can also use substringAfter

[LIRAN Y]

@Joffrey i tried to use removePrefix but it didnt work

[Joffrey]

Are you sure you have the correct case for the prefix? Maybe the D is lowercase in the actual input?

[Joffrey]

This definitely works:

val input = "Expiration Date: \"2023-01-03 16:06:52 +0000 UTC\""
val output = input.removePrefix("Expiration Date: ")
println(output) // prints "2023-01-03 16:06:52 +0000 UTC"

https://pl.kotl.in/JKslLmEkY