The code examples use ==, which does lossy comparison. Using === is much safer. The tools section mentions JSLint which flags any use of == as an error. JavaSc

The code examples use ==, which does lossy comparison. Using === is much safer. The tools section mentions JSLint which flags any use of == as an error. JavaScript is such a quirky language that I always want the code to pass JSLint and Closure Compiler with 100% type annotation. I simply do not feel confident about the code otherwise. I'm surprised about the lack of space after 'if'. 'if' is not a function so 'if(' looks weird.