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JavaScript - Basics
Did You Know?
- External scripts cannot contain <script> tags
- JavaScript and Java are completely different languages, both in concept and design
- ECMA-262 is the official name. ECMAScript 6 was released in June 2015 and we're already up to version 9
- Numbers are not allowed as the first character of a variable name
- JavaScript IS case-sensitive
- Some web servers (Apache, Unix) ARE case sensitive about file names
- null is for objects, undefined is for variables, properties, and methods
- All function arguments are optional and you can even pass in more than a function expects