How does jslint work?

Question

How does jslint check for problems in javascript? Does it have an actual javascript parser?

Answer 1

JSLint is written in JavaScript and uses a Pratt Parser. It "works" by parsing the source provided and looks for "problems". These problems are defined by the author, and are not necessarily syntax-related.

It should be noted that "JSLint defines a professional subset of JavaScript". This means that not all pure ECMAScript would appear valid in JSLint.