‘use strict’ javascript

The EcmaScript 5 definition includes a declaration to switch the engine running your code into so-called “strict mode.” This is often touted as an obviously beneficial way to catch programmer mistakes, because in strict mode a browser will throw runtime errors when it encounters script that, while not syntactically wrong, is at least bad practice.

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.

ECMAScript 5 Strict Mode, JSON, and More


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