exec: what-are-rest-parameters-and-how-are-they-used

Author: tahachm

questions/what-are-rest-parameters-and-how-are-they-used/en-US.mdx

@@ -6,7 +6,7 @@ title: What are rest parameters and how are they used?
 
 Rest parameters in JavaScript allow a function to accept an indefinite number of arguments as an array. They are denoted by three dots (`...`) followed by the name of the array. This feature is useful for functions that need to handle multiple arguments without knowing the exact number in advance.
 
-```js
+```js live
 function sum(...numbers) {
   return numbers.reduce((acc, curr) => acc + curr, 0);
 }
@@ -26,10 +26,12 @@ Rest parameters allow a function to accept an indefinite number of arguments as
 
 The syntax for rest parameters is straightforward. You place three dots before the last parameter in the function definition:
 
-```js
+```js live
 function myFunction(a, b, ...rest) {
   // 'rest' is an array containing the remaining arguments
+  console.log(rest); // [3, 4, 5]
 }
+myFunction(1, 2, 3, 4, 5);
 ```
 
 ### Usage
@@ -40,7 +42,7 @@ Rest parameters are useful in various scenarios, such as when you need to handle
 
 Here's a simple example of a function that sums an indefinite number of arguments:
 
-```js
+```js live
 function sum(...numbers) {
   return numbers.reduce((acc, curr) => acc + curr, 0);
 }
@@ -54,7 +56,7 @@ In this example, the `sum` function uses the rest parameter `numbers` to collect
 
 Rest parameters can also be used to combine multiple arrays into one:
 
-```js
+```js live
 function combineArrays(...arrays) {
   return arrays.flat();
 }