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      2. Ruby 官方文檔

        Resource

        Related

        Bignum

        Bignum

        Complex

        Float

        Fixnum

        Fixnum

        Proc

        Random

        Rational

        Rational

        Symbol

        Pre-defined

        Variables

        • $`
        • The string to the left of the last successful match.
        • $_
        • The last input line of string by gets or readline.
        • $-0
        • The alias to $/
        • $-a
        • True if option -a is set. Read-only variable.
        • $-d
        • The alias to $DEBUG.
        • $-F
        • The alias to $;.
        • $-i
        • In in-place-edit mode, this variable holds the extention, otherwise nil.
        • $-l
        • True if option -l is set. Read-only variable.
        • $-p
        • True if option -p is set. Read-only variable.
        • $-v
        • The alias to $VERBOSE.
        • $,
        • The output field separator for the print and Array#join.
        • $;
        • The default separator for String#split.
        • $:
        • Load path for scripts and binary modules by load or require.
        • $!
        • The exception information message set by ‘raise’.
        • $?
        • The status of the last executed child process.
        • $.
        • The current input line number of the last file that was read.
        • $'
        • The string to the right of the last successful match.
        • $"
        • The array contains the module names loaded by require.
        • $@
        • Array of backtrace of the last exception thrown.
        • $*
        • Command line arguments given for the script sans args.
        • $/
        • The input record separator, newline by default.
        • $\
        • The output record separator for the print and IO#write. Default is nil.
        • $&
        • The string matched by the last successful pattern match in this scope.
        • $>
        • The default output for print, printf. $stdout by default.
        • $<
        • The virtual concatenation file of the files given on command line.
        • $+
        • The last bracket matched by the last successful match.
        • $=
        • The flag for case insensitive, nil by default.
        • $~
        • The information about the last match in the current scope.
        • $$
        • The process number of the Ruby running this script.
        • $0
        • Contains the name of the script being executed. May be assignable.
        • $1
        • The Nth group of the last successful match. May be > 1.
        • $DEBUG
        • The status of the -d switch.
        • $FILENAME
        • Current input file from $<. Same as $<.filename.
        • $LOAD_PATH
        • The alias to the $:.
        • $stderr
        • The current standard error output.
        • $stdin
        • The current standard input.
        • $stdout
        • The current standard output.
        • $VERBOSE
        • The verbose flag, which is set by the -v switch.

        Global Constant

        • ARGV
        • The alias to the $*.
        • DATA
        • The file object of the script, pointing just after __END__.
        • ENV
        • The hash contains current environment variables.
        • FALSE
        • The false itself.
        • NIL
        • The nil itself.
        • RUBY_PLATFORM
        • The platform identifier
        • RUBY_RELEASE_DATE
        • The relase date string.
        • RUBY_VERSION
        • The ruby version string (VERSION was depricated).
        • STDERR
        • The standard error output. The default value for $stderr.
        • STDIN
        • The standard input. The default value for $stdin.
        • STDOUT
        • The standard output. The default value for $stdout.
        • TRUE
        • The typical true value.
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