isValid.js

// Zip codes consist of 5 consecutive digits. Given a string, write a function to determine whether the input is a valid zip code.
// A valid zip code is as follows:
// Must only contain numbers (no non-digits allowed).
// Must not contain any spaces.
// Must not be greater than 5 digits in length.

// Examples:
// isValid("59001") ➞ true
// isValid("853a7") ➞ false
// isValid("732 32") ➞ false
// isValid("393939") ➞ false

function isValid(zip) {
  //   let num = Number(zip);
  //   //   console.log(zip.length);
  //   return /\s/.test(zip) || zip.length > 5 || !num ? false : true;
  console.log(!isNaN(zip));

  //   return zip.length == 5 && !isNaN(zip);
}
console.log(isValid("59220"));