let isAlpha $=$ function$($ch$)\{$ if $($ch $>="$A$"$ && ch $<="$Z$")$

return true;

else

return false; $\}$;

Copy the function definition above and paste it into lab$5.$js$.$

b$)$ Test the function in the console using the two tests shown here. Note that it only recognizes capitalized alphabetic characters. console.log$($isAlpha$("$R$"))$; $//$ expect true

console.log$($isAlpha$("$r$"))$; $//$ expect false

c$)$ Now modify the function to recognize both uppercase and lowercase alphabetic characters. Don$$t forget to place this function in your lab$5.$js file. Hint: One way is to use either the String method toLowerCase$()$ or the String method toUpperCase$().$