const number = document.getElementById(“user-input”)
const results = document.getElementById(“results-div”);
const clear = document.getElementById(“clear-btn”);
const phoneNumber = new Set([“1 555-555-5555”,
“1 (555) 555-5555”,
“5555555555”,
“555-555-5555”,
“(555)555-5555”,
“1(555)555-5555”,
“1 555 555 5555”,
“1 456 789 4444”])
const validateNumber = () => {
let numberInput= number.value
if(!numberInput){
alert("Please provide a phone number");
return;}
else if(phoneNumber.has(numberInput)){
results.textContent = `Valid US number: ${numberInput}`}
else {
results.textContent = `Invalid US number: ${numberInput}`
}
}