Simple .NET/ASP.NET PDF document editor web control SDK

Tip Ordinary strings can also span several lines. If the last character on a line is a backslash, the line break

begin ... code here ... rescue ZeroDivisionError ... code to rescue the zero division exception here ... rescue YourOwnException ... code to rescue a different type of exception here ... rescue ... code that rescues all other types of exception here ... end

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This code contains multiple rescue blocks, each of which is caused depending on the type of exception raised. If a ZeroDivisionError is raised within the code between begin and the rescue blocks, the rescue ZeroDivisionError code is executed to handle the exception.

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As well as handling different types of exceptions using different code blocks, it s possible to receive exceptions and use them. This is achieved with a little extra syntax on the rescue block:

itself is escaped, and is ignored. For example:

Rather than merely performing some code when an exception is raised, the exception object itself is assigned to the variable e, whereupon you can use that variable however you wish. This is particularly useful if the exception class contains extra functionality or attributes that you want to access.

will follow the evidence that leads them to the company (Point A), and then they want to bring the situation to justice (Point B). The underlying structure of conventional PowerPoint presentations rarely engages audiences at an emotional level, leaving them struggling to gure out why this information is relevant to them. But with Act I of the story template, Mark s presentation ef ciently adapted a story technique to make the topic personally relevant to his audience. By creating a gap between Point A where the jurors stood and Point B where they wanted to be, Mark tapped into the core element of classical story structure unresolved tension. People do not sit comfortably with tension, and it is the quest to resolve tension that compels a main character to action. By presenting the jurors with a problem, Mark engaged the jurors both emotionally and intellectually, and he answered the toughest audience question any presenter faces: What s in this for me

Although creating your own exceptions and exception handlers is useful for resolving error situations, sometimes you want to be able to break out of a thread of execution (say, a loop) during normal operation in a similar way to an exception, but without actually generating an error. Ruby provides two methods, catch and throw, for this purpose. catch and throw work in a way a little reminiscent of raise and rescue, but catch and throw work with symbols rather than exceptions. They re designed to be used in situations where no error has occurred, but being able to escape quickly from a nested loop, method call, or similar, is necessary.

catch(:finish) do 1000.times do x = rand(1000) throw :finish if x == 123 end puts "Generated 1000 random numbers without generating 123!" end