Does JavaScript (ECMAScript5) Strict Mode offer significant performance advantages to merit widespread use?

Question

I\'m reading up a bit on using Strict Mode for JavaScript and it seems that, generally speaking, the idea is to force a more rigid set of rules onto the coder to ensure that the

Answer 1

Well, strict mode code can certainly perform better because it removes issues that made optimization harder, for example, from the top of my head:

• The with statement was removed (Really difficult -if not impossible- to optimize).
• No more undeclared assignments, and other prohibitions, e.g. (delete varName;)
• eval does not introduce variable/function declarations into the local scope.
• arguments.callee was removed, (difficult to optimize (e.g. function inlining))
• The arguments object index named properties are not anymore dynamically mapped to the named formal parameters.