Alpply while/do loop to a text layers, see no characters… why?

[Dan Ebberts]

The myText variable is initially an empty string, and the loop appends one random character at a time until it is 500 characters long, and then it’s the result of the expression. Is that what you mean?

Dan

[Assaf Goldlust]

this is the quote from the boook

[Assaf Goldlust]

this is what im trying to figure out why