Hi everyone! Prior to my problem, I want to thank everyone who has contributed in this site! I've been having a blasting time learning Swift with this site!

Okay back to my problem. I got to the topic "Properties and methods of strings" and I encountered problem using string.contains("") -> Bool. Here is the code:

let HelloWorld = "Hello World"

print(HelloWorld.contains("Hello"))

The above code in my Xcode playground running Swift 5.1 comes with this error: cannot convert value of type 'String' to expected argument type 'String.Element' (aka 'Character')

*it is definitely print(HelloWorld.contains("Hello")) in the picture, it looks blurry

let swift = "Hello World"

print(swift.contains("Hello"))

Works fine here. Prints true. Though swift is not a really well chosen variable name. I would change that. I guess you have a typo somewhere ...

Thank you for the reply!

Here is a photo of the error Xcode shows me. It's very strange that it works on yours but not mine. Do you know if there can be any underlying issues with my Xocde?

Strange! I can't reproduce your error here? Is this all of the code?

yes thats all of the codes.

So I just noticed I lied in the beginning, I was using swift playground with swift 5.1, but just now I do the same on xcode, it came out with the same error as well

here's a picture

Thanks for the reply! That's brilliant I will try it when I get to the topic about importing foundation!