ostso · HackerTrans

14 tahun yang laludiscuss

    unset -f command_not_found_handle

ostso

14 tahun yang laludiscuss

For more on monoids, see Brent Yorgey's paper _Monoids: Theme and Variations (Functional Pearl)_ at <http://www.cis.upenn.edu/~byorgey/pub/monoid-pearl.pdf>; (there's also a video of his talk at the Haskell Symposium at <http://www.youtube.com/watch?v=X-8NCkD2vOw>).

ostso

14 tahun yang laludiscuss

Perhaps mistercow means things like

  def foo():
    x = 5
    def bar():
      print x
    def baz():
      x = 6
      print x
    bar()
    baz()
    print x

Which prints 5, 6, 5. If baz tried to print x before assigning, it would be an UnboundLocalError.

ostso

14 tahun yang laludiscuss

Not really -- "any" and "filter" are total functions, but "first" of an empty list is undefined.

On the other hand, that also applies to foldl1 and {max,min}imum{,By}, so it's probably not the reason.

The reason is probably that in JavaScript you can just say a[0] to get the first element element of a.

ostso

14 tahun yang laludiscuss

You should add the word "web" to the title. There are many other kinds of caching.

ostso

15 tahun yang laludiscuss

That's a fixed-point combinator, but it's not actually the Y combinator; in fact, it defeats much of the purpose of Y, since it's defined using explicit recursion, which Y is designed to avoid.

If you just want a clear definition of a fixed-point combinator, you might as well use a non-strict language like Haskell, which doesn't require you to eta-expand g. Here's one recursive definition of fix in Haskell:

    fix f = f (fix f)

This is probably the clearest definition you could ask for of what a fixed-point combinator actually is (other than something like "fix f = f (f (f (f (f ...", which is more difficult to give to a computer).

Here's another one, which closer to what you gave in JavaScript (this is what you'll actually find in the Haskell standard libraries):

    fix f = let x = f x in x

(Of course, due to type-checking, it's non-trivial to define the actual non-recursive Y in Haskell; you usually have to resort to using some type-level recursion. But in an untyped non-strict language you could define it easily enough.)

ostso

15 tahun yang laludiscuss

"bar none" is a little excessive -- Haskell's syntax is probably even cleaner. Compare:

  1. map (*2) [1..10]

  2. sum [1..1000]
     -- sum = foldl (+) 0

  3. any (`isInfixOf` tweet) wordlist

  4. fileText <- readFile "data.txt"
     fileLines <- lines <$> readFile "data.txt"

  5. mapM_ putStrLn . map (\i -> "Happy Birthday " ++ if i == 3 then "dear NAME" else "to You") $ [1..4]

  6. (passed, failed) = partition (>60) [49,58,76,82,88,90]

  7. -- I avoid XML so I don't know what library you'd use here.

  8. minimum [14, 35, -7, 46, 98]
     -- minimum = foldl1 min

ostso

15 tahun yang laludiscuss

No, because robbing someone of their incentive to work is a net loss to society, so the bandits would no longer be perfect (unless they in turn gain a corresponding incentive to work, or some other equivalent gain).

There are no perfect bandits, let along a society full of them. Scenarios like "If all members of a society were perfect bandits" are hypothetical and don't really translate to any actual human society that you could imagine. Even so, they're useful for illustrating concepts.

ostso

16 tahun yang laludiscuss

This title is designed to get people to click it (to discover what "The One Group" is), rather than to be informative. Please add e.g. ": Developers" to the end of it, so that people can click on it only if they actually want to read the article.

ostso

16 tahun yang laludiscuss

The difference is that the whole point of the Y combinator is that it's a fixed-point combinator that doesn't use explicit recursion. Imagine that you didn't have "var", and couldn't name anything (which is the situation in, say, the lambda calculus). Using the Y combinator you could still define recursive functions.

ostso

16 tahun yang laludiscuss

> The court determined that the discount was intended to encourage women to attend the bar in greater numbers, rather than to discourage attendance by males.

Regardless of whether it should be legal or not, "positive discrimination" is still discrimination.

ostso

16 tahun yang laludiscuss

Here is Richard Feynman's answer to a similar question (this isn't about gravity but about this type of question): http://www.youtube.com/watch?v=wMFPe-DwULM

ostso

16 tahun yang laludiscuss

Some methods:

1. Change your layout from "USA" to "USA International (AltGr dead keys)". Then use right-alt+key to make various special characters (you can look at what each character does at "Show Current Layout").

2. Enable the "compose key" -- I use the Menu key for this -- which is described at http://sivers.org/compose-key (it's simple to enable: Keyboard Preferences→Layouts→Options→Compose Key Position). Both of these are customizable, so you can add your own combinations if you want.

There are some other ways:

3. Ctrl-Shift-U in a GTK+ text input to enter a code point, as you said.

4. Alternative input methods that let you type special characters in in various other ways, such as LaTeX names, if you prefer that.

ostso

16 tahun yang laludiscuss

It is somewhat ironic that this article is on www.theonion.com...

ostso

16 tahun yang laludiscuss

That seems like a fairly cliché series of dichotomies. Life isn't black and white; if choices were always this clear-cut then they wouldn't be hard.

ostso

16 tahun yang laludiscuss

> Either that, or getting a Ph.D. in Education.

Is this a Heinlein reference?

ostso

16 tahun yang laludiscuss

At any rate it violates Facebook's terms (http://www.facebook.com/terms.php, 4.5): "You will not use Facebook if you are under 13."

ostso

16 tahun yang laludiscuss

More Feynman on the same topic ("Energy makes it go"): http://physics.gu.se/~f3aamp/teaching/wakalix.html

ostso

16 tahun yang laludiscuss

See <http://news.ycombinator.com/item?id=277099>; -- the linked post doesn't seem to work for me, but the first link in the first comment does.

ostso

16 tahun yang laludiscuss

> The singular "they", on the other hand, is artificial, at least among people of my generation -- we already have "one", thank you very much.

Huh? Singular "they" has little to do with "one" -- it's used as an alternative to "he"/"she" when the gender is unknown (like the Finnish "hän", for instance).

It may or may not be artificial, but what would you use instead?

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