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Re:Ruby basics (1 viewing) (1) Guest
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TOPIC: Re:Ruby basics
#4547
ShriNi (User)
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Re:Ruby basics 3 Years, 10 Months ago Karma: 0  
Using raise Statement

We can use raise statement to raise an exception. The following method raises an exception whenever it's called.
 
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#4548
ShriNi (User)
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Re:Ruby basics 3 Years, 10 Months ago Karma: 0  
Using raise Statement:

Syntax:
raise

OR

raise "Error Message"

OR

raise ExceptionType, "Error Message"

OR

raise ExceptionType, "Error Message" condition
 
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#4549
ShriNi (User)
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Re:Ruby basics 3 Years, 10 Months ago Karma: 0  
The first form simply reraises the current exception (or a RuntimeError if there is no current exception).

This is used in exception handlers that need to intercept an exception before passing it on.
 
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#4550
ShriNi (User)
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Re:Ruby basics 3 Years, 10 Months ago Karma: 0  
The second form creates a new RuntimeError exception, setting its message to the given string.

This exception is then raised up the call stack.
 
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Re:Ruby basics 3 Years, 10 Months ago Karma: 0  
The third form uses the first argument to create an exception and then sets the associated message to the second argument.

The third form is similar to third form but you can add any conditional statement like unless to raise an exception.
 
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#4552
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Re:Ruby basics 3 Years, 10 Months ago Karma: 0  
Using ensure Statement

Sometimes we need to guarantee that some processing is done at the end of a block of code, regardless of whether an exception was raised.
 
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