Answer to Question #63155 in AJAX | JavaScript | HTML | PHP for Miguel Rivera

Question

Write a function that takes in one argument. The function should return true if the passed in argument is a valid X Number. A valid X number is 9 characters in length, begins with a X and ends with 8 digits. The function should return false if it is not valid X Number.
Call the function 4 times, 2 times with valid X Numbers and 2 times with invalid X Numbers and display the results.

Answer 1

function checkNumber(n) {
return n.match(/^X\d{8}/)?true:false;
}

console.log(checkNumber('X00878765'));
console.log(checkNumber('X28878765'));
console.log(checkNumber('X2887876'));
console.log(checkNumber('32887876'));