4 ms·

I think Scala is hands down the best collections/stream library, I especially like their _ shorthands: val num = words.count(!_.isEmpty())

by kaba0 3y ago

Marazan 3y ago
I think that is a horrifying crime against man and nature. If I wanted to write PERL I would do so.
- kaba0 3y ago
  What is hard to understand about it? _ is universally used as a placeholder, it also usable in pattern matching. Scala can be used to make some perl-y <!! operators, but it is not like that at all, and makes for very readable, understandable code.
  - haspok 3y ago
    Also targeted at Java 22: https://openjdk.org/jeps/456 https://openjdk.org/jeps/456 (Unnamed Variables & Patterns)
skrebbel 3y ago
Same, I wish more languages had that shorthand
layer8 3y ago
Understanding bird droppings like “!_.()” relies on quite some prerequisites.
- kaba0 3y ago
  ! contradicts a boolean. _.isEmpty() is a lambda, applying the isEmpty function on its string parameter. It’s just the two things together.
  - layer8 3y ago
    I know all this. But as I said, pulling it all together involves quite a number of concepts represented by idiosyncratic punctuation, much more than “count all non-empty elements”.
    - kagakuninja 3y ago
      Then your team can write lambdas in a more verbose, but less cryptic style.
- philipkglass 3y ago
  When I was introducing a team to Scala I wrote everything in a more verbose style just to make it clear, e.g. val num = words.count(word => word.nonEmpty) The "bird droppings" (particularly the clever uses of _ found across Scala) were hard for me to grasp when I first started working in the language. Now they're second nature, but I try to remain cognizant of future maintainers who may be coming in to make contributions or bug fixes without first marinating in the language.
- dionian 3y ago
  The nice thing is you can just write it like `x => !x.isEmpty` if you want
sedro 3y ago
Or more succinctly val num = words.count(_.nonEmpty)

I think Scala is hands down the best collections/stream library, I especially like their _ shorthands: val num = words.count(!_.isEmpty())

by kaba0 3y ago

I think Scala is hands down the best collections/stream library, I especially like their _ shorthands: val num = words.count(!_.isEmpty())

Marazan 3y ago

I think that is a horrifying crime against man and nature. If I wanted to write PERL I would do so.

kaba0 3y ago
What is hard to understand about it? _ is universally used as a placeholder, it also usable in pattern matching. Scala can be used to make some perl-y <!! operators, but it is not like that at all, and makes for very readable, understandable code.
- haspok 3y ago
  Also targeted at Java 22: https://openjdk.org/jeps/456 https://openjdk.org/jeps/456 (Unnamed Variables & Patterns)

skrebbel 3y ago

Same, I wish more languages had that shorthand

layer8 3y ago

Understanding bird droppings like “!_.()” relies on quite some prerequisites.

kaba0 3y ago
! contradicts a boolean. _.isEmpty() is a lambda, applying the isEmpty function on its string parameter. It’s just the two things together.
- layer8 3y ago
  I know all this. But as I said, pulling it all together involves quite a number of concepts represented by idiosyncratic punctuation, much more than “count all non-empty elements”.
  - kagakuninja 3y ago
    Then your team can write lambdas in a more verbose, but less cryptic style.
philipkglass 3y ago
When I was introducing a team to Scala I wrote everything in a more verbose style just to make it clear, e.g. val num = words.count(word => word.nonEmpty) The "bird droppings" (particularly the clever uses of _ found across Scala) were hard for me to grasp when I first started working in the language. Now they're second nature, but I try to remain cognizant of future maintainers who may be coming in to make contributions or bug fixes without first marinating in the language.
dionian 3y ago
The nice thing is you can just write it like `x => !x.isEmpty` if you want

sedro 3y ago

Or more succinctly val num = words.count(_.nonEmpty)