JavaScript Operator Lookup
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If you replace your || with ?? You should get the behaviour you are after. This is a good reference for what the operators do in js: https://joshwcomeau.com/operator-lookup. Source: almost 3 years ago
That said, Jon Duckett has a book which offers a very good introduction to its usage. https://javascriptbook.com/. Source: almost 2 years ago
Javascriptbook.com - you can preview the book here. You can also download all the code examples Jon uses in his JS book. People who say the book is outdated and such - the book is awesome because it does a great job of teaching JS. The code files include comments for almost every line of JS. People with no programming background will understand the purpose and reasoning behind every line. Source: almost 3 years ago
John Duckett's books are an excellent place to start. Http://javascriptbook.com/ He also has an HTML & CSS Book. (both available on Amazon). Source: almost 3 years ago
JavaScript.com - A free resource for learning and developing in JavaScript
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