Update introduction.md

Add a paragraph and example about storing a function's return value in a variable.
exercism · Jul 31, 2024 · 39ece5e · 39ece5e
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diff --git a/exercises/concept/lasagna-master/.docs/introduction.md b/exercises/concept/lasagna-master/.docs/introduction.md
@@ -58,6 +58,17 @@ function checkNumber(num) {
 }
 ```
 
+The return value of a function can be stored in a variable.
+
+```javascript
+function sum(x, y) {
+  return x + y;
+}
+
+const total = sum(5, 10);
+// => 15
+```
+
 The result of a function that `return`s no value or does not have a `return` statement is `undefined`.
 There are no implicit `return`s in JavaScript.