added Kernel.then/2

Author: superruzafa

assets/images/functions/Kernel/then-2.tex

@@ -0,0 +1,4 @@
+\node (fun) [fun];
+\draw [<-] (fun.in) -- +(0, 1) node [above] {$a$};
+\draw [->] (fun.out) -- +(0, -1) node [below] {$b$};
+

content/en/functions/Kernel/then-2.md

@@ -0,0 +1,11 @@
+---
+title: then/2
+url: Kernel/then/2
+---
+
+Pipes the first argument, `value`, into the function `fun`, and returns its result.
+
+This is most commonly used in pipelines, using the `|>/2` operator, allowing you to pipe a value to a function outside of its first argument.
+
+{{< figure src="images/functions/Kernel/then-2.svg" >}}
+

data/signatures.yaml

@@ -623,6 +623,11 @@
         defmodule Kernel do
           def tap(value, fun)
         end
+    - name: then/2
+      signature: |
+        defmodule Kernel do
+          def then(value, fun)
+        end
 
 - name: Keyword
   functions: