$2.$ Create a variable called phone and assign the value $888-123-1234.$ Using the substring$()$ function, output the area code $($the $1$st $3$ characters$).$

$3.$ Use the substr$()$ function to return the phone number without the area code for the variable phone used in problem $2.$ For example, output $123-1234.$

$4.$ Create a variable called sentence with the text 'I love flavor ice cream!$\text{'}$ Using the replace$()$ function, replace the text 'flavor' with your favorite flavor.

$5.$ Create variables called addr$=\text{'}123$ Main St$\text{'},$ city$=$'Cleveland', state$=\text{'}$Oh$\text{'},$ and zip code$=44115.$ Output the address in all uppercase letters as it would appear on the front of an envelope $($newlines$,$ commas, etc$).$ Use the appropriate function to convert the strings to uppercase letters.

$6.$ Create a variable called helpdesk and assign a value of 'HelpDesk@Tri$-$C$.$edu'. Use a string function to convert it to all lowercase letters and output the value.

$7.$ Create a variable called id with a value of $\text{'}007\text{'}.$ Use padStart$()$ to output the value $\text{'}000000007\text{'}$ with $9$ characters total.

$8.$ Create variables for firstName and lastName. Assign your name to the variables. Use template literals to output 'Hello firstName lastName!$\text{'}.$ Template literals can be found in the $"$JS String Templates" tutorial.

$9.$ Create a variable called joke with the following string: 'Why don't programmers like nature? It has too many bugs.$\text{'}$ Define the value on multiple lines using back$-$tics syntax.

$10.$ Write an expression that returns true from a call to isNaN$().$ Display the output returned from isNaN$().$

$11.$ Use toFixed to output the results of $20+10/3$ formatted like currency $(2$ decimal places$)$ with dollars and cents.

$12.$ Use parseInt$()$ to output the whole number value for $10\mathrm{.}335.$

$13.$ Use an appropriate function call to check to see if $20\mathrm{.}5$ is an integer.

$14.$ Explain why the following call returns a value of undefined.

MAX$\_$LENGTH of x $=$ undefined

$15.$ Create a Date object called d and assign the current date and time using new Date$().$ output the value of d$.$

$16.$ Subtract $1$ year from d and output the value.

$17.$ Output the toUTCString$()$ value of d$.$

$18.$ Output only the year from d$.$

$19.$ Output a short date with a format similar to $08-01-2035$ using d$.$

$20.$ Output the day of the week using d and getDay$().$