diff --git a/README.md b/README.md
index a7c6483..366687e 100644
--- a/README.md
+++ b/README.md
@@ -10,7 +10,7 @@ working across different projects via [VisualMode](https://www.visualmode.dev/).
 
 For a steady stream of TILs, [sign up for my newsletter](https://visualmode.kit.com/newsletter).
 
-_1853 TILs and counting..._
+_1854 TILs and counting..._
 
 See some of the other learning resources I work on:
 
@@ -619,6 +619,7 @@ If you've learned something here, support my efforts writing daily TILs by
 - [Easy Date Comparison With DayJS](javascript/easy-date-comparison-with-dayjs.md)
 - [Expand Emojis With The Spread Operator](javascript/expand-emojis-with-the-spread-operator.md)
 - [Fill An Input With A Ton Of Text](javascript/fill-an-input-with-a-ton-of-text.md)
+- [Filter By Truthy Values With Boolean Function](javascript/filter-by-truthy-values-with-boolean-function.md)
 - [Find The Version Of An Installed Dependency](javascript/find-the-version-of-an-installed-dependency.md)
 - [Find Where Yarn Is Installing Binaries](javascript/find-where-yarn-is-installing-binaries.md)
 - [for...in Iterates Over Object Properties](javascript/for-in-iterates-over-object-properties.md)
diff --git a/javascript/filter-by-truthy-values-with-boolean-function.md b/javascript/filter-by-truthy-values-with-boolean-function.md
new file mode 100644
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+++ b/javascript/filter-by-truthy-values-with-boolean-function.md
@@ -0,0 +1,42 @@
+# Filter By Truthy Values With Boolean Function
+
+The `Boolean` function (not to be confused with the `Boolean` constructor)
+evaluates any given value to its [boolean
+coercion](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Boolean#boolean_coercion).
+
+```javascript
+> Boolean(0)
+false
+> Boolean(1)
+true
+> Boolean(null)
+false
+> Boolean([])
+true
+```
+
+One way that this can be put to use is as a _boolean identity function_ for
+passing to other functions like `filter`.
+
+```javascript
+> [0, 1, "", [], "four", null, "six", undefined, 7].filter(Boolean)
+[ 1, [], 'four', 'six', 7 ]
+```
+
+This filters out all the non-truthy values from a list.
+
+Let's say I'm building a list of nav items that will be rendered to the UI for a
+specific user. Based on permissions or feature flags, certain nav items may not
+be available. Those "empty" entries can be filtered out in this way.
+
+```javascript
+nav_items = [
+  { label: "Home", href: "/" },
+  isSystemAdmin && { label: "System", "/system" },
+  featureEnabled(user, "api") && { label: "API", "/api" },
+].filter(Boolean)
+```
+
+If any of those conditional nav items evaluate to `false`, then they will be
+filtered out. The resulting `nav_items` array is a clean list of actual nav
+items I want to render.