fix.id2name → string or nil

Returns the name of the object whose symbol id is fix. If there is no symbol in the symbol table with this value, returns nil. id2name has nothing to do with the Object.id method. See also Fixnum#to_sym, String#intern, and class Symbol.

symbol = :@inst_var    #=> :@inst_var
id     = symbol.to_i   #=> 9818
id.id2name             #=> "@inst_var"

Source Code

/*
*  call-seq:
*     fix.id2name -> string or nil
*  
*  Returns the name of the object whose symbol id is <i>fix</i>. If
*  there is no symbol in the symbol table with this value, returns
*  <code>nil</code>. <code>id2name</code> has nothing to do with the
*  <code>Object.id</code> method. See also <code>Fixnum#to_sym</code>,
*  <code>String#intern</code>, and class <code>Symbol</code>.
*     
*     symbol = :@inst_var    #=> :@inst_var
*     id     = symbol.to_i   #=> 9818
*     id.id2name             #=> "@inst_var"
*/

static VALUE
fix_id2name(fix)
   VALUE fix;
{
   char *name = rb_id2name(FIX2UINT(fix));
   if (name) return rb_str_new2(name);
   return Qnil;
}