Add Open Finder.app To Specific Directory as a Mac til

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).
 
-_1184 TILs and counting..._
+_1186 TILs and counting..._
 
 ---
 
@@ -478,6 +478,7 @@ _1184 TILs and counting..._
 - [Gesture For Viewing All Windows Of Current App](mac/gesture-for-viewing-all-windows-of-current-app.md)
 - [Insert A Non-Breaking Space Character](mac/insert-a-non-breaking-space-character.md)
 - [List All The Say Voices](mac/list-all-the-say-voices.md)
+- [Open Finder.app To Specific Directory](mac/open-finder-app-to-specific-directory.md)
 - [Quickly Type En Dashes And Em Dashes](mac/quickly-type-en-dashes-and-em-dashes.md)
 - [Require Additional JS Libraries In Postman](mac/require-additional-js-libraries-in-postman.md)
 - [Resize App Windows With AppleScript](mac/resize-app-windows-with-applescript.md)
@@ -1081,6 +1082,7 @@ _1184 TILs and counting..._
 
 - [Add Types To An Object Destructuring](typescript/add-types-to-an-object-destructuring.md)
 - [Compiler Checks For Unused Params And Variables](typescript/compiler-checks-for-unused-params-and-variables.md)
+- [Interfaces With The Same Name Are Merged](typescript/interfaces-with-the-same-name-are-merged.md)
 - [Re-Export An Imported Type](typescript/re-export-an-imported-type.md)
 - [Type Narrowing With Similarly Shaped Objects](typescript/type-narrowing-with-similarly-shaped-objects.md)
 - [Use An Array Check For Type Narrowing](typescript/use-an-array-check-for-type-narrowing.md)

mac/open-finder-app-to-specific-directory.md

@@ -0,0 +1,29 @@
+# Open Finder.app To Specific Directory
+
+The Mac OSX built-in GUI for navigating directories and files is _Finder.app_.
+I use it just about anytime I need to drag a file on my machine into Slack,
+Discord, Google Drive, or wherever else has a file drop zone.
+
+Sometimes certain directories can be hard to navigate to because they are
+deeply nested or because Mac hides them by default. The `~/Library` directory
+is a great example of the latter.
+
+I can use the `open` command from the terminal to open a Finder window right in
+that directory.
+
+```bash
+$ cd ~/Library
+$ open .
+```
+
+I first navigated there and then I ran `open .` which means open the current
+directory. For directories, `open` defaults to using Finder.app.
+
+I could have also run `open` with the target directory name instead of
+navigating there first.
+
+```bash
+$ open ~/Library
+```
+
+See `man open` for more details.

typescript/interfaces-with-the-same-name-are-merged.md

@@ -0,0 +1,39 @@
+# Interfaces With The Same Name Are Merged
+
+Here is the declartion of an interface in TypeScript.
+
+```typescript
+interface Person {
+  name: string
+}
+```
+
+What if I were to add a separate interface declaration with the same name,
+`Person`?
+
+```typescript
+interface Person {
+    age: number
+}
+```
+
+TypeScript performs declaration merging. So the types of the two interfaces
+would be combined. So, a variable of type `Person` can have an `name` and an
+`age`.
+
+```typescript
+const person: Person = {
+    age: 22,
+    name: 'Bob'
+}
+```
+
+See a [live
+example](https://www.typescriptlang.org/play?ssl=12&ssc=2&pln=5&pc=1#code/JYOwLgpgTgZghgYwgAgArQM4HsTIN4BQyxyIcAthAFzIZhSgDmBAvgQaJLIiulNrkIlkcRtVIBXcgCNordghx1kAB0w4afAcgC8+IiVHiATMYA0B4mUo0A5ACEs02-IJr+OAHRGgA)
+in the TS Playground.
+
+This is different from how object type declarations handle it. If I were to try
+to define two separate `type`s with the same name, that would result in a type
+error.
+
+[source](https://www.typescriptlang.org/docs/handbook/declaration-merging.html#merging-interfaces)