Need Groovy script to Append or Prepend Custom field value to Summary field value

[Murugan Mittapalli]

Hi,

I never used the Groovy Script, I have one requirement that I would like to Append or Prepend the drop-down custom field value to Summary field value, it is like concatenation of Drop-down field value and Summary field value upon issue creation.

Field Name-1: Summary 

Field Name-2: Zone Name(Dropdown custom field)

Can anybody help me out with this code? Thanks!!