setInterval is (moderately) evil

JavaScript has two ways of delaying execution of code: setInterval and setTimeout . Both take a function or a string as the first parameter, and a number of milliseconds as the second parameter. The only difference is that the code provided to setInterval will run every n milliseconds whereas the code in setTimeout will run only once. Before I explain why I think setInterval is evil, allow me to rant on a related subject for a paragraph: you should never pass a string into any of those functions and instead always pass a function reference (unless you really, really know what you?re doing). If you pass a string, it will have to be evaluated on the fly, and eval is quite evil itself (unless you really, really know what you?re doing). It might...(read more) ...