handling errors ruby tutorial 28
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certainly! in ruby, error handling is primarily done using exceptions. an exception is an event that occurs during the execution of a program that disrupts the normal flow of instructions. ruby provides a robust mechanism for handling exceptions using `begin`, `rescue`, `ensure`, `else`, and `raise`.
error handling in ruby
1. basic structure
the basic structure for handling exceptions in ruby is as follows:
2. example: division with error handling
let’s create a simple example where we handle division by zero and other possible errors.
explanation of the code
**begin**: the block of code that may raise an exception is enclosed within the `begin` keyword.
**rescue**: this is where you handle specific exceptions. in the example, we handle:
`zerodivisionerror`: this occurs when trying to divide by zero.
`typeerror`: this occurs when attempting to divide a number by a non-numeric type (like a string).
**else**: this block executes only if no exceptions were raised in the `begin` block. it’s useful for code that should run if everything goes smoothly.
**ensure**: the code inside this block will always execute, regardless of whether an exception was raised or not. it’s often used for cleanup actions, such as closing files or releasing resources.
3. raising exceptions
you can also raise exceptions manually using the `raise` keyword. here's how you might modify the `safe_divide` method to raise a custom error if the inputs are not numbers:
summary
use `begin` to start a block of code that may raise exceptions.
use `rescue` to define how to handle specific exceptions.
use `else` for code that runs when no exceptions occur.
use `ensure` for cleanup tasks that should run regardless of what happens.
use `raise` to trigger exceptions manually when certain conditions aren’t met.
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