“Dead method context” error in a function

Question

I am trying to write a isBinary function that checks sent line if it has any non-printable characters (integer value outside range 0-127):

isBinary         


        

Answer 1

Following standalone method/block code works by creating a return variable whose value is manipulated in loop if unprintable character is found. The loop is then exited:

isBinary := [ :sline |            "WORKS"
    'Reached isBinary fn: ' display.
    ret := false.                 "return variable initialized to false"
    sline do: [ :char |           "loop for each character in sent line"
        i := char asInteger.      "convert to integer"
        i > 127                   "check if printable"
        ifTrue: [ret := true. exit]].   "ret becomes true if found unprintable; does not work if ^ symbol is used"  
    ret].            "if not found above, ret remains false; ret is returned value"

Above works without creating a class as desired by OP (me!).