lelf

  fold[max] y  # maximum
  fold[min] y  # minimum

  | — logical-or,  min
  & — logical-and, max

    0|1
  1
    1|42
  42

That’s intensive. And sad.

  for x in 3 1 2 5 4; do (sleep $x; echo $x) & done

  sort ≡ head ∘ sort ∘ permutations

   fun(F)->fun(X)->F(fun(V)->X(X(V))end)end(fun(X)->F(fun(V)->X(X(V))end)end)end

But I think Perl6 is the only language that can do this magic:

  > 'Déjà vu' ~~ /:ignorecase:ignoremark deja \s vu/
  ｢Déjà vu｣

  > $*COLLATION.set(:!secondary:!tertiary:!quaternary)
  collation-level => 1, Country => International, Language => None, primary => 1, secondary => 0, tertiary => 0, quaternary => 0

  > '１２' coll '12'
  Same

  > "\c[latin small letter e]\c[combining acute accent]" eq "\c[latin small letter e with acute]"
  True

  > "\c[dog face]".chars
  1

PS: WTF? HN strips emojis :/ (and does it incorrectly when they are emoji sequences).

> system tap, ktap, lttng, ftrace, etc

That's why I'm talking about NIH.

Even with ebfp, they intentionally choose different tracing syntax (just look at it, it's comical). Didn't use ready-to-use CTF. Etc etc etc.

Dogs can fly^Wrun without remote control.

  $ dtrace -n 'pid$target::strlen:entry { print(arg0) }' -c './a.out 2'
  CPU     ID                    FUNCTION:NAME
  ⋮
    4  22139                     strlen:entry int64_t 0

> how do you write all those non-ASCII symbols using a standard OS and text editor?

Modifier+KEY or PrefixKey KEY

All symbols are in Unicode. No special tools required.

        ]KEYB
  US Keyboard Layout:

  ╔════╦════╦════╦════╦════╦════╦════╦════╦════╦════╦════╦════╦════╦═════════╗
  ║ ~  ║ !⌶ ║ @⍫ ║ #⍒ ║ $⍋ ║ %⌽ ║ ^⍉ ║ &⊖ ║ *⍟ ║ (⍱ ║ )⍲ ║ _! ║ +⌹ ║         ║
  ║ `◊ ║ 1¨ ║ 2¯ ║ 3< ║ 4≤ ║ 5= ║ 6≥ ║ 7> ║ 8≠ ║ 9∨ ║ 0∧ ║ -× ║ =÷ ║ BACKSP  ║
  ╠════╩══╦═╩══╦═╩══╦═╩══╦═╩══╦═╩══╦═╩══╦═╩══╦═╩══╦═╩══╦═╩══╦═╩══╦═╩══╦══════╣
  ║       ║ Q  ║ W⍹ ║ E⋸ ║ R  ║ T⍨ ║ Y¥ ║ U  ║ I⍸ ║ O⍥ ║ P⍣ ║ {⍞ ║ }⍬ ║  |⊣  ║
  ║  TAB  ║ q? ║ w⍵ ║ e∈ ║ r⍴ ║ t∼ ║ y↑ ║ u↓ ║ i⍳ ║ o○ ║ p⋆ ║ [← ║ ]→ ║  \⊢  ║
  ╠═══════╩═╦══╩═╦══╩═╦══╩═╦══╩═╦══╩═╦══╩═╦══╩═╦══╩═╦══╩═╦══╩═╦══╩═╦══╩══════╣
  ║ (CAPS   ║ A⍶ ║ S  ║ D  ║ F  ║ G  ║ H  ║ J⍤ ║ K  ║ L⌷ ║ :≡ ║ "≢ ║         ║
  ║  LOCK)  ║ a⍺ ║ s⌈ ║ d⌊ ║ f_ ║ g∇ ║ h∆ ║ j∘ ║ k' ║ l⎕ ║ ;⍎ ║ '⍕ ║ RETURN  ║
  ╠═════════╩═══╦╩═══╦╩═══╦╩═══╦╩═══╦╩═══╦╩═══╦╩═══╦╩═══╦╩═══╦╩═══╦╩═════════╣
  ║             ║ Z  ║ Xχ ║ C¢ ║ V  ║ B£ ║ N  ║ M  ║ <⍪ ║ >⍙ ║ ?⍠ ║          ║
  ║  SHIFT      ║ z⊂ ║ x⊃ ║ c∩ ║ v∪ ║ b⊥ ║ n⊤ ║ m| ║ ,⍝ ║ .⍀ ║ /⌿ ║  SHIFT   ║
  ╚═════════════╩════╩════╩════╩════╩════╩════╩════╩════╩════╩════╩══════════╝

  Also in Version 12.0, the following Unicode Standard Annexes have notable modifications ⟨…⟩
  UAX #14, Unicode Linebreaking Algorithm
  UAX #29, Unicode Text Segmentation
  UAX #31, Unicode Identifier and Pattern Syntax
  UAX #38, Unicode Han Database (Unihan)
  UAX #45, U-Source Ideographs

Wait several months.

Good idea to learn both, anyway :-P

Edit: compilation speed too, huge difference

There is dialyzer, a static type (and not only) analysis tool for Erlang. It is part of Erlang/OTP (i. e. built-in.)

http://erlang.org/doc/apps/dialyzer/users_guide.html

> Linux 4.13 and 4.15: fsync() only reports writeback errors that occurred after you called open()

No. Not even close.

See https://wiki.postgresql.org/wiki/Fsync_Errors