Merge 295fe153ad into 95115c7ebc

Hello, I've added a small blockquote below the description to indicate that this method of accessing an indefinite number of function arguments has been superseded by the use of the spread operator via rest parameters for ES6+ compatibility.

README.md

@@ -10,7 +10,7 @@ pairing with smart people at Hashrocket.
 
 For a steady stream of TILs, [sign up for my newsletter](https://crafty-builder-6996.ck.page/e169c61186).
 
-_1491 TILs and counting..._
+_1493 TILs and counting..._
 
 ---
 
@@ -771,6 +771,7 @@ _1491 TILs and counting..._
 - [Force SSL When Making A psql Connection](postgres/force-ssl-when-making-a-psql-connection.md)
 - [Generate A UUID](postgres/generate-a-uuid.md)
 - [Generate Modern Primary Key Columns](postgres/generate-modern-primary-key-columns.md)
+- [Generate Random Alphanumeric Identifier](postgres/generate-random-alphanumeric-identifier.md)
 - [Generate Random UUIDs Without An Extension](postgres/generate-random-uuids-without-an-extension.md)
 - [Generate Series Of Numbers](postgres/generate-series-of-numbers.md)
 - [Generating UUIDs With pgcrypto](postgres/generating-uuids-with-pgcrypto.md)
@@ -1516,6 +1517,7 @@ _1491 TILs and counting..._
 - [Switch Versions of a Brew Formula](unix/switch-versions-of-a-brew-formula.md)
 - [Tell direnv To Load The Env File](unix/tell-direnv-to-load-the-env-file.md)
 - [Touch Access And Modify Times Individually](unix/touch-access-and-modify-times-individually.md)
+- [Undo Changes Made To Current Terminal Prompt](unix/undo-changes-made-to-current-terminal-prompt.md)
 - [Undo Some Command Line Editing](unix/undo-some-command-line-editing.md)
 - [Unrestrict Where ripgrep Searches](unix/unrestrict-where-ripgrep-searches.md)
 - [Update Package Versions Known By asdf Plugin](unix/update-package-versions-known-by-asdf-plugin.md)

javascript/accessing-arguments-to-a-function.md

@@ -5,6 +5,8 @@ an array-like object with all of the arguments to the function. Even if not
 all of the arguments are referenced in the function signature, they can
 still be accessed via the `arguments` object.
 
+> For ES6+ compatibility, the `spread` operator used via [rest parameters](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Functions/rest_parameters) is preferred over the `arugments` object when accessing an abritrary number of function arguments.
+
 ```javascript
 function argTest(one) {
   console.log(one);

postgres/generate-random-alphanumeric-identifier.md

@@ -0,0 +1,46 @@
+# Generate Random Alphanumeric Identifier
+
+Here is a PostgreSQL query that uses
+[`pgcrypto`](https://www.postgresql.org/docs/current/pgcrypto.html) (for
+[`get_random_bytes`](https://www.postgresql.org/docs/current/pgcrypto.html#PGCRYPTO-RANDOM-DATA-FUNCS))
+and a CTE to generate a cryptographically-random 8-character alphanumeric
+identifier.
+
+```sql
+-- First ensure pgcrypto is installed
+create extension if not exists pgcrypto;
+
+-- Generates a single 8-character identifier
+with chars as (
+  -- excludes some look-alike characters
+  select '23456789ABCDEFGHJKLMNPQRSTUVWXYZabcdefghijkmnpqrstuvwxyz' as charset
+),
+random_bytes as (
+  select gen_random_bytes(8) as bytes
+),
+positions as (
+  select generate_series(0, 7) as pos
+)
+select string_agg(
+  substr(
+    charset,
+    (get_byte(bytes, pos) % length(charset)) + 1,
+    1
+  ),
+  '' order by pos
+) as short_id
+from positions, random_bytes, chars;
+```
+
+The
+[`generate_series`](https://www.postgresql.org/docs/current/functions-srf.html)
+gives us an 8-row table from 0 to 7 that we can use as indexes into the byte
+positions of the value we get from `gen_random_bytes`. Those random bytes get
+mapped to individual alphanumeric characters from `chars`. That then gets
+squeezed together with `string_agg`.
+
+Note: the character set excludes some characters that can be mistaken for one
+another like `0` and `O` or `1` and `l`.
+
+Note: you could change the right-bound of the `generate_series` to generate a
+different length identifier.

unix/undo-changes-made-to-current-terminal-prompt.md

@@ -0,0 +1,20 @@
+# Undo Change Made to Current Terminal Prompt
+
+I frequently use a variety of ASCII command characters like `ctrl-u` to delete
+the entire line or `ctrl-a` to jump to the front of a long line so I can make
+some edits toward that side of the command or `ctrl-e` to jump to the end of
+the command for the same reason. I sometimes even use `ctrl-k` to delete
+everything after the cursor to the end of the line.
+
+What I didn't realize until now is that any of those commands the modify the
+current line of the termianl prompt plus regular typing and hitting the
+backspace are all _undoable_.
+
+So, if I just wiped out half the line (with `ctrl-k`) and I immediately regret
+it, I can restore it with `ctrl-_`. The system keeps of history of the actions
+you've taken, so you can keep hitting `ctrl-_` to undo even further.
+
+The `ctrl-/` command does the same, per GNU's [Undo Changes in the Emacs
+docs](https://www.gnu.org/software/emacs/manual/html_node/emacs/Basic-Undo.html).
+
+[source](https://jvns.ca/ascii)