Javascript “Cannot read property 'length' of undefined” when checking a variable's length

Question

I\'m building a node scraper that uses cheerio to parse the DOM. This is more or a vanilla javascript question though. At one part of

Answer 1

As has been discussed elsewhere, the .length property reference is failing because theHref is undefined. However, be aware of any solution which involves comparing theHref to undefined, which is not a keyword in JavaScript and can be redefined.

For a full discussion of checking for undefined variables, see Detecting an undefined object property and the first answer in particular.