Ruby Tips Part 2
globaldev.co.uk
globaldev.co.uk
I’m also partial to this trick for grabbing just the first element of an array.
family, = socket.peeraddr
family = socket.peeraddr.first
>>> [a] = range(1)
>>> [a] = range(2)
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
ValueError: too many values to unpack
I do agree with you, but through some failing of my own I still quite enjoy that trick. I included it to highlight the syntax, but I'll add a note saying it's maybe not the best idea to actually use it.
I put it in production code once, but removed it when I realised the "# This comma is important" comment was longer than just using `.first`
family, _ = socket.peeraddr
first,_ = list
first,second,_ = list >> Array([{:a => "b"}])
=> [{:a=>"b"}]
>> Array({:a => "b"})
=> [[:a, "b"]]
a = [a] unless a.is_a?(Array) # option 1
a = [*a] # option 2> There’s one final use for the splat ( * ); when overriding methods in a subclass and calling super. If it turns out you don’t need the arguments to the method for whatever additional behaviour you’re adding, you can accept all arguments with a bare splat, then a bare super passes all arguments to super.
I thought that was the default behavior of super. Isn't it the case that a bare super by default passes all the method's original arguments? I know this has bit me in the past where I've been forced to call `super()` with empty parentheses explicitly to prevent this behavior.
My intention wasn't to say that super only works like that when you've defined the method like `def foo( * )` but rather `def foo( * )` is an alternative to having to name your arguments when you're not even going to use them as they are automatically passed with bare super.
Excellent resource BTW. Keep them coming.