3Language Basics
At the core of any language is a description of how it should work at the most basic level. This description typically defines syntax, operators, data types, and built-in functionality upon which complex solutions can be built. As previously mentioned, ECMA-262 defines all of this information for JavaScript in the form of a pseudolanguage called ECMAScript.
ECMAScript as defined in ECMA-262 is implemented with increasing uniformity across all major browsers. A decade ago, major browsers had widely divergent support for some ECMAScript features. Today, features included in the annual ECMAScript editions are usually supported by all major browsers in less than a year.
SYNTAX
ECMAScript's syntax borrows heavily from C and other C-like languages such as Java and Perl. Developers familiar with such languages should have an easy time picking up the somewhat looser syntax of ECMAScript.
Case-Sensitivity
The first concept to understand is that everything is case-sensitive; variables, function names, and operators are all case-sensitive, ...
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