-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 On 07/22/2010 01:27 AM, John Sampson wrote: > This would mention the need to escape the backslash, which to > a newbie like myself is not obvious.
Escaping the backslash is documented under the reader. The reader is the program that parses your written text into something the computer can understand. Any time you type something that Racket can't parse (and therefore understand), you would probably benefit from reading the documentation on the reader. http://docs.racket-lang.org/reference/reader.html#%28part._parse-string%29 I might add that the backslash has been used as an escape character long before a certain operating system existed called "MSDOS". It's one of the first incompatibilies Microsoft ever employed to try and confuse and disempower their user base, so it's understandable if you were caught off guard by it. A standard rule is that in any programming language anywhere ever (perl, python, racket, C, ruby, etc) when you want to represent a string literal with a backslash in it, you must type two backslashes. A backslash by itself might seem like a good idea, but if you let the backslash be by itself, without requiring \\ , you can never write a string with just one backslash in it. Because if you write a string with just one " character in it, that's "\"", since you must escape the quote character to keep the string from ending prematurely. So "\" would start reading a string literal, read an escaped quote character, then error out because you never closed the string literal with an unescaped quote character. Look on the bright side at least you didn't try to check (directory-exists? "C:\newiconSource"). ..." -----BEGIN PGP SIGNATURE----- Version: GnuPG v2.0.14 (GNU/Linux) Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org/ iQEcBAEBAgAGBQJMSlABAAoJECC/cKf8E7UIpdEIALNIM6VVv4NtnmI98ZaHwtjM tGDmZcHWcEdOqxIDWx76ajlaoKM73Q1ZpctiRgXUk1s+YImvQ7Z01zU3xS+qGPrn BzLj/w2a4Y/QW9h0oyZdQJfY0YilHktkR++nH4/qmdB+CFexkoanSC/F71jAOkGn LqaF2xbckbJjIhwdvbUBgckOcDDukNeUUxY16Bld+igo2XAANm/s0Pbx9xWIfgyk IpyBVC03z5gImga8DgdbT16f4h5GQPwRb4IbcNw/X/ySGZ4JYehke+WeUHlA0hXe eIIr45gJ7KRL7wH4e2P3MqlRxVS3AAw3Vd8232/InNjdlrbRimqpYRX/yrJrJBs= =/vk2 -----END PGP SIGNATURE----- _________________________________________________ For list-related administrative tasks: http://lists.racket-lang.org/listinfo/users
