Ruby doc runtime error

ruby doc runtime error

The second form creates a new RuntimeError exception, setting its message to the given string. This exception is then raised up the call stack. The third form. A generic error class raised when an invalid operation is attempted. Kernel#raise will raise a RuntimeError if no Exception class is specified. Ruby-doc.org. As per Ruby's documentation if when we do not mention any class while raising an exception then by default it is RuntimeError class. In Ruby all exceptions. ruby doc runtime error

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Ruby doc runtime error
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How to raise any object as a Internal mac receive errors exception

Ruby's raise syntax gives you a couple of options for specifying the kind of error you want raised. In the code below, I've shown three ways to raise a RuntimeError.

That's nice, but what happens when I want to raise something other than an exception? What if I wanted to raise a number? Well, Ruby won't let me. I'd get an error message like this:

Now ruby doc runtime error message might lead you to believe that raise expects an exception class/object as a parameter. But that's incorrect!

Introducing the method

If you do the raise method doesn't expect foo to be an exception object. It expects that it will get zebra zm400 error out ribbon exception object whenever it calls .

The thing to remember is that you can pass ANYTHING to raise, just as long as it has a method called exception that returns an exception.

So, if you wanted to, you could monkeypatch ruby's number classes to allow you to raise a number. Here's what that might look like:

This is a neat party trick, but could it ever be useful in real life? The main practical application I see for this technique is to separate the logic required to build an exception from the logic that decides to raise the exception. This is certainly a bit of an edge case. But let's see what that might look like.

A possibly practical example

Suppose I want to read a line of data from some kind of IO. It could be network IO, it could be a file, ruby doc runtime error. It doesn't really matter. I just want to read the data and see if it's valid.

If the data I read isn't valid, I want to raise ruby doc runtime error exception. But the exception needs to be tailored to the input. A network connection needs backup bios checksum error fix have different debug info than a local file. I can do that by providing custom exception methods for each kind of input class. Here's some pseudo-ruby showing what that might look like.

obj == Qundef) { rb_set_errinfo(Qnil); return Qfalse; } if (rb_obj_class(exc) != rb_obj_class(obj)) return Qfalse; mesg = rb_check_funcall(obj, id_message, 0, 0); if (mesg == Qundef) return Qfalse; backtrace = rb_check_funcall(obj, ruby doc runtime error, id_backtrace, 0, ruby doc runtime error, 0); if (backtrace == Qundef) return Qfalse; } else { mesg = rb_attr_get(obj, id_mesg); backtrace = exc_backtrace(obj); } if (!rb_equal(rb_attr_get(exc, id_mesg), mesg)) return Qfalse; if (!rb_equal(exc_backtrace(exc), backtrace)) return Qfalse; return Qtrue; }