function telephoneCheck(str) {
// A phone number must have 10 digits or 11 digits if the first number is a 1
for (let i = 0; i < str.length; i++) {
if (str[i] > "0" && str[i] <= "9" && str.length() == 10 || str[i] > "0" && str[i] <= "9" && str.length() == 11 && str[0] == "1") return true;
}
// Anything else is false
return false;
}
telephoneCheck("555-555-5555");

Does anyone know how I can check if the str length is equal to 10 or 11? The way I am currently trying just tells me that str.length() is not a function. If I can find a way to fix that I think this should work, but I think it may not because things may get tricky when the phone number includes - or a space

str.length is not a function. Maybe skip the parentheses and try str.length. what you are trying might not work, not least because the string has dashes in it, making it longer than 10 or 11 digits. Consider using regular expressions

function telephoneCheck(str) {
// A phone number must have 10 digits or 11 digits if the first number is a 1
for (let i = 0; i < str.length; i++) {
if (str[i] > "0" && str[i] <= "9" && str.length == 10 || str[i] > "0" && str[i] <= "9" && str.length == 11 && str[0] == "1") return true;
}
// Anything else is false
return false;
}
telephoneCheck("555-555-5555");

Ahhh I see, it runs all the test now but I need to go about this in a different way. It passes all of the ones that should return false and two of the true tests but that doesn’t mean much because I am not accounting for the - or () or spaces.

I thought this could possibly work but I was wrong. I am checking everything in the correct format examples they gave, but those aren’t passing with this code. I know there’s more I would have to check because some of the tests are unique. But I am surprised the examples in the question aren’t passing

function telephoneCheck(str) {
return /^(1\s|1)?(\(\d{3}\)|\d{3})(-|\s)?\d{3}(-|\s)?\d{4}$/.test(str);
}
// starts with 1 followed by space or just 1 (? = not required)
// "(" followed by 3 digits OR just 3 digits
// followed by - OR space (? = not required) another 3 digits followed by - OR space (? = not required)
// ends with 4 digits
telephoneCheck("555-555-5555");

Finally got it. Regex can be really confusing, even though I got it I still don’t see how I accounted for a possible “)”…I thought I only accounted for the “(”? Can someone help me understand?