vault backup: 2023-12-09 17:00:50

docs/React/The Complete Guide Docs/functions and parameters.md

@@ -17,4 +17,17 @@ function greet() {
 greet() // Hello World!
 ```
 
-* Functions can take parameters, 
+* Functions can take parameters, knows as input values
+* Parameters are then available within the scope of the function
+* The idea behind parameters, is that you can have one re-usable function, that can be re-used with different input values
+```js
+function greet(userName, message) {
+  console.log(`${message} ${userName}`);
+}
+
+greet("Liam", "Hello");
+greet("Frazer", "Hello")
+```
+
+* You can assign default values to parameters, by adding a `=` sign
+* The default value can be overridden, by simply providing a value