Plus (+) and minus (-)

Question

This works;
var namn = field._name;
field.text = (namn +"_txt");
This doesn't;
var namn = field._name;
field.text = (namn -"_txt");
How to leave out "_txt" from name? I could rename my instance
but just want to know why this doesn't work.

Answer 1

"thejokerman05" <[email protected]> wrote in
message
news:ehgg45$ahi$[email protected]..
> This works;
> var namn = field._name;
> field.text = (namn +"_txt");
>
> This doesn't;
> var namn = field._name;
> field.text = (namn -"_txt");
>
> How to leave out "_txt" from name? I could rename my
instance but just
> want to
> know why this doesn't work.
>
namn is a String. Strings can be concatenated with a +
because it makes
sense.
But subtracting it could mean many things like removing
matches from the end
of the String, or removing all matches.
Instead there are other ways to do this, for instance...
field.text = field._name.split("_txt")[0];