Source R←⎕SRC Y

⎕SRC returns the script that defines the scripted object Y.

Y must be a reference to a scripted object. Scripted objects include Classes, Interfaces and scripted Namespaces.

R is a vector of character vectors containing the script that was used to define Y.

      )ED ○MyClass

:Class MyClass
∇ r←foo arg
:Access public shared
r←1+arg
∇
:EndClass

      z←⎕SRC MyClass
      ⍴z
6
      ⍴¨z
 14  15  27  13  5  9 
      ⍪z
 :Class MyClass
     ∇ r←foo arg
       :Access public shared
       r←1+arg
     ∇
 :EndClass

The only two ways to permanently alter the source of a scripted object are to either change the object in the editor or to refix it using ⎕FIX.