help()関数すげー

JavaScript

Momonga-devel.ja:03544 経由で spidermonkey の help() 関数なるものを見つけてしまった。

js> help();
JavaScript-C 1.7.0 2007-10-03
Command        Usage                  Description
=======        =====                  ===========
version        version([number])      Get or set JavaScript version number
options        options([option ...])  Get or toggle JavaScript options
load           load(['foo.js' ...])   Load files named by string arguments
readline       readline()             Read a single line from stdin
print          print([exp ...])       Evaluate and print expressions
help           help([name ...])       Display usage and help messages
quit           quit()                 Quit the shell
gc             gc()                   Run the garbage collector
trap           trap([fun, [pc,]] exp) Trap bytecode execution
untrap         untrap(fun[, pc])      Remove a trap
line2pc        line2pc([fun,] line)   Map line number to PC
pc2line        pc2line(fun[, pc])     Map PC to line number
stringsAreUtf8 stringsAreUTF8()       Check if strings are UTF-8 encoded
testUtf8       testUTF8(mode)         Perform UTF-8 tests (modes are 1 to 4)
throwError     throwError()           Throw an error from JS_ReportError
build          build()                Show build date and time
clear          clear([obj])           Clear properties of object
intern         intern(str)            Internalize str in the atom table
clone          clone(fun[, scope])    Clone function object
seal           seal(obj[, deep])      Seal object, or object graph if deep
getpda         getpda(obj)            Get the property descriptors for obj
getslx         getslx(obj)            Get script line extent
toint32        toint32(n)             Testing hook for JS_ValueToInt32
evalcx         evalcx(s[, o])         Evaluate s in optional sandbox object o
    if (s == '' && !o) return new o with eager standard classes
    if (s == 'lazy' && !o) return new o with lazy standard classes

readline()とか面白げだ。GCがあるのもなにげにすごいぞ。

ところでファイル書き出しとかする手段とかってないのかな。それを探していたんだが。