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Strict Mode is a new feature in ECMAScript 5 that allows you to place a program, or a function, in a "strict" operating context. This strict context prevents certain actions from being taken and throws more exceptions (generally providing the user with more information and a tapered-down coding experience).

Since ECMAScript 5 is backwards-compatible with ECMAScript 3, all of the "features" that were in ECMAScript 3 that were "deprecated" are just disabled (or throw errors) in strict mode, instead.

Strict mode helps out in a couple ways:

* It catches some common coding bloopers, throwing exceptions.
* It prevents, or throws errors, when relatively "unsafe" actions are taken (such as gaining access to the global object).
* It disables features that are confusing or poorly thought out.



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http://ejohn.org/blog/ecmascript-5-strict-mode-json-and-more/




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