method

raise

v2_1_10 - Show latest stable - Class: Kernel

raise(*args)

public

With no arguments, raises the exception in $! or raises a RuntimeError if $! is nil. With a single String argument, raises a RuntimeError with the string as a message. Otherwise, the first parameter should be the name of an Exception class (or an object that returns an Exception object when sent an exception message). The optional second parameter sets the message associated with the exception, and the third parameter is an array of callback information. Exceptions are caught by the rescue clause of begin…end blocks.

raise "Failed to create socket"
raise ArgumentError, "No parameters", caller

static VALUE
rb_f_raise(int argc, VALUE *argv)
{
    VALUE err;
    if (argc == 0) {
        err = get_errinfo();
        if (!NIL_P(err)) {
            argc = 1;
            argv = &err;
        }
    }
    rb_raise_jump(rb_make_exception(argc, argv));

    UNREACHABLE;
}

2Notes

rescue

nachocab · Feb 28, 20091 thank

Store exceptions using 'rescue => var' begin
x = factorial(-1)
rescue => ex
puts "#{ex.class}: #{ex.message}" end

Exceptions while debugging

nachocab · Feb 28, 2009

If the error wasn't stored in a variable, you can still see it by looking at the global variable $ERROR_INFO.

raise

2Notes

rescue

Exceptions while debugging

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