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ROPE Language Reference - "isdigit"

"isdigit" pops a string off the top of the stack and checks whether every character it contains is a numerical digit ("0" to "9"). If so: 1 (true) is pushed back onto the stack, otherwise 0 is pushed back.

As a special case: if the string is empty, the return is 0.

Example:

 "Hello" isdigit println        # -- prints: 0
 "1234" isdigit println         # -- prints: 1
 "COF90" isdigit println        # -- prints: 0
 isdigit( "981" ) println       # -- prints: 1
 isdigit( "123" "DEF" ) println # -- error! too many arguments
 239 isdigit println            # -- error! not a string

See Also

isalnum, isalpha, isascii, iscntrl, iseoln, isgraph, islower, isprint, ispunct, isspace, isupper, isxdigit

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