TAILIEUCHUNG - HandBooks Professional Java-C-Scrip-SQL part 231

Tham khảo tài liệu 'handbooks professional java-c-scrip-sql part 231', công nghệ thông tin, kỹ thuật lập trình phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | Chapter 3. Built-in Library Reference We will now explore the core functionality that is built into the standard Ruby interpreter. You will find descriptions of more than 800 built-in methods in 42 classes and modules. Topics covered include predefined variables predefined global constants and built-in functions. Top Ruby in a Nutshell By Yukihiro Matsumoto Chapter 3. Built-in Library Reference Predefined Variables Ruby s predefined built-in variables affect the behavior of the entire program so their use in libraries isn t recommended. The values in most predefined variables can be accessed by alternative means. The last exception object raised. The exception object can also be accessed using in rescue clause. @ The stack backtrace for the last exception raised. The stack backtrace information can retrieved by Exception backtrace method of the last exception. The input record separator newline by default . gets readline etc. take their input record separator as optional argument. The output record separator nil by default . The output separator between the arguments to print and Array join nil by default . You can specify separator explicitly to Array join. The default separator for split nil by default . You can specify separator explicitly for String split. . The number of the last line read from the current input file. Equivalent to . Synonym for ARGF. Synonym for defout. 0 The name of the current Ruby program being executed. The of the current Ruby program being executed. The exit status of the last process terminated. Synonym for LOAD_PATH. DEBUG True if the -d or - -debug command-line option is specified. defout The destination output for print and printf stdout by default . F The variable that receives the output from split when -a is specified. This variable is set if the -a command-line option is specified along with the -p or -n option. FILENAME The name of the file currently being read from ARGF. Equivalent .

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