[Swift-user] Treatment of booleans in Swift

[Mihael Hategan]

On Mon, 2014-05-19 at 23:22 +0000, Bronevetsky, Greg wrote:
> I've been working with Booleans recently and I've run into a couple of issues with them that might be a problem for others:
> 
> -          tracef doesn't have a format option for Booleans, forcing
> me to convert them to strings. Running @toInt on a Boolean produces:
> "java.lang.NumberFormatException: For input string: "false"".

I think the documentation is lying (by omission) about that. Try "%b".

> 
> -          It is not clear how to format files to be read by
> readData() if the data in question is a Boolean. Based on
> experimentation I discovered that the correct strings are
> "True"/"False" rather than "true"/"false" or "0"/"1". It would be
> useful to document this in the description of readData().

All of "True" and "true" and "TRUE" and "tRuE" (and all other case
combinations) should work. The implementation uses Java's
Boolean.valueOf(String), which calls this:
    private static boolean toBoolean(String name) {
        return ((name != null) && name.equalsIgnoreCase("true"));
    }

Mihael