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Exercise 9.1: Displaying a message
Rewrite the anonymous function that displays a short message as an arrow function. Verify that the arrow function is not hoisted by calling the function before creating it.
Exercise 9.2: Joining two strings
Rewrite the anonymous declaration that joins the two strings as an arrow function.
Exercise 9.3: Pass an argument when calling a function
Rewrite the anonymous function that passes a number as an arrow function.
Exercise 9.4: Return a value from a called function
Rewrite the anonymous function that calls a random number generator function as an anonymous function.
Exercise 9.5: Create an immediately invoked function
Copy the function in exercise 10-1, rename it, and re-write it as an immediately invoked arrow function.