Make argument optional ruby
Optional method parameters in Ruby Posted on by John Wood One of the things I love about Ruby is the flexibility it provides when it comes to method parameters.
However, this feature alone is capable of producing some makke readable code, make argument optional ruby is used extensively in APIs throughout the Ruby ecosystem. You would either be forced to require that each parameter be specified: What is this code doing?
The third option however does not resemble idiomatic Ruby anymore but looks more like C or Perl where we have to deal with numeric indexes instead of well-named variables and arguments. With that in mind, which ever variant you use, try to use one of these methods consistently throughout your module to allow people reading make argument optional ruby code to recognize the pattern and thus to reduce the cognitive load required to understand what the code does. Using one of the techniques described in this article should generally be your last resort since they will never be as clear as a simple method definition with simple default values.
What do the nil values, or even source true and false values map to? You have the names of the attributes right next to their corresponding values! There is no ambiguity whatsoever as to which values match up with which parameters.
It even works exactly the same with the new keyword arguments introduced in Ruby 2. This method allows to fetch the value for a make argument optional ruby key from a Hash object. Just from looking at the method definition, we can no longer see how many arguments the method accepts but have to look into the method body. It is also worth pointing out that while this approach is great for optional parameters, it is ill suited for required parameters. The default part, i. You have the names of the attributes just click for source next to their corresponding values!
It is also very flexible. The order of the attributes in the hash does not matter, like it does for mkae attributes.
- And, it is very easy to add new options, or delete old ones.
- Which option to use depends a bit on which traits of the code should be emphasized.
- If no arguments are supplied, then p will be an empty array, otherwise, it will be an array that contains the values of all the arguments that were passed in.
And, it is very easy to add new options, or delete old ones. The first is documentation.
This page documents, in a very clear and easy opfional read mannor, all of the supported options for each method. It is also worth pointing out that while this approach is great for optional parameters, it is ill suited for required read more. Required parameters should be specified outside of the just click for source hash, making it clear that make argument optional ruby for the required parameters must be provided.
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You have the names read article the attributes right next to their corresponding values! And, it is very easy to add new options, or delete old ones. Since this pattern should be used only if nil itself is not a suitable default value, this would be required anyways though.