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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