Copy Pasta – Useful Characters

This resource is provided for quick and easy copy-paste of special characters.

Superscript numerals
⁰ ¹ ² ³ ⁴ ⁵ ⁶ ⁷ ⁸ ⁹ ⁺ ⁻ ⁼ ⁽ ⁾

Subscript numerals
₀ ₁ ₂ ₃ ₄ ₅ ₆ ₇ ₈ ₉ ₊ ₋ ₌ ₍ ₎

Arrows
← ↑ → ↓ ↔

Logic Symbols

  • ⇒, ∴ – it follows that (⇒), or therefore (∴)
  • ∵ – because (inverse of “therefore”, ∴)

Greek Letters

Uppercase and lowercase letters, including variants, uninteresting and ambiguous characters excluded.

αβ Γγ Δδ ϵε Ϝϝ ζ η Θθϑ κϰ Λλ μ Ξξ Ππϖ ρϱ Σσς τ Φϕφ Ψψ Ωω

See Also

Remove unwanted blobs from your GIT history

If you have some large binary files in your GIT history, you probably want to kill/maim/destroy them to bring down the size of your repository. Here’s how.

This command removes all blobs matching the specified pattern from all commits in your history. If any commits end up empty, those commits are removed too. In my case, I wanted to remove all files matching the pattern “data/binary/big/*.dbt”.

git filter-branch --prune-empty --index-filter 'git rm -rf --cached --ignore-unmatch data/binary/big/*.dbt' --tag-name-filter cat -- --all

Now let’s do some garbage collection.


git pack-refs --all --prune
git reflog expire --expire-unreachable=now --all
git repack -A -d
git gc --aggressive --prune=now

Then push your changes to the upstream repository.

git push origin --force --all

Ted Naleid has a great write-up if you want to better understand exactly what’s going on here.
The GC commands I got from Drew Powers.

Google V8 Javascript Engine: Platform, Isolate and Context. What are they for?

This is a question I found myself asking again and again while finding my way around Google’s V8 Javascript engine.

What’s the difference between an Isolate and a Context? (and, for that matter, a Platform?)

A Platform captures the global initialization for V8. You need one, and you only ever need exactly one.

An Isolate can only be accessed by one thread at a time. If you are writing a single-threaded application, you can get away with only one Isolate. Objects from one Isolate must not be used in another Isolate.

A Context keeps each distinct “application” in it’s own “namespace”. You can freely pass objects between Contexts.

See also: