Scala Array [Byte] diff

I'm using the diff method to compare two arrays of string bytes, but it gives unexpected results (or is this expected behavior?).

diff()

returns true

for (subString diff originalString)

, but returns false

for (originalString diff subString)

. It would be great if someone can explain this. Sample code and output are shown below.

Snippet of code

val subString : Array[Byte] = "cde".getBytes("UTF-8")
val originalString : Array[Byte] = "abcdefg".getBytes("UTF-8")

println(s"compare subString with originalString - ${((subString diff originalString).isEmpty).toString}")
println(s"compare originalString with subString - ${((originalString diff subString).isEmpty).toString}")

      

        
        
        
      

    

Output

compare subString with originalString - true

compare originalString with subString - false