mirror of
https://github.com/jbranchaud/til
synced 2026-01-02 22:58:01 +00:00
29 lines
794 B
Markdown
29 lines
794 B
Markdown
# Define A Method On A Struct
|
|
|
|
When defining a Ruby `Struct`, you can optionally pass it a block that defines
|
|
any number of methods as instance methods on that `Struct`. They can reference
|
|
the attributes of the `Struct`.
|
|
|
|
Here is an example of a person `Struct` with a `full_name` method that uses the
|
|
`first_name` and `last_name` attributes.
|
|
|
|
```ruby
|
|
Person = Struct.new(:first_name, :last_name, :age) do
|
|
def full_name
|
|
"#{first_name} #{last_name}"
|
|
end
|
|
end
|
|
```
|
|
|
|
This `Struct` can be used like so:
|
|
|
|
```ruby
|
|
> liz = Person.new("Liz", "Lemon", 39)
|
|
=> #<struct Person first_name="Liz", last_name="Lemon", age=39>
|
|
> liz.full_name
|
|
=> "Liz Lemon"
|
|
```
|
|
|
|
This is a great way to make a `Struct` just a bit more powerful without having
|
|
to convert it into a full-blown PORO (plain old Ruby object).
|