What are the best practices for using Ruby Lambda in Rails?

What are the best practices for using Ruby Lambda in Rails?

When using Ruby Lambda in Rails, it's important to keep your code clean and maintainable. Here are some best practices:

1. Use descriptive names for your lambdas.
2. Keep lambdas short and focused on a single task.
3. Avoid side effects in your lambdas to maintain predictability.
4. Test your lambdas thoroughly.

Can you give an example of a well-structured lambda?

Sure! Here's a simple example of a lambda that filters an array of numbers:

filter_even = ->(numbers) { numbers.select(&:even?) }
result = filter_even.call([1, 2, 3, 4, 5])
puts result # Output: [2, 4]

How do I handle errors in lambdas?

You can handle errors in lambdas by using begin...rescue blocks. For example:

safe_lambda = ->(x) {
  begin
    10 / x
  rescue ZeroDivisionError
    'Cannot divide by zero'
  end
}
puts safe_lambda.call(0) # Output: Cannot divide by zero

Are there performance considerations I should be aware of?

Yes, while lambdas are generally efficient, excessive use can lead to performance issues, especially if they capture large contexts. Always profile your code to ensure optimal performance.