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Aug 12, 2013 at 13:43
Today I learnt "use strict"; even forbids with() statements! https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Functions_and_function_scope/Strict_mode#Simplifying_variable_uses Probably a good thing.
Strict mode - JavaScript | MDN
JavaScript's strict mode is a way to opt in to a restricted variant of JavaScript, thereby implicitly opting-out of "sloppy mode". Strict mode isn't just a subset: it intentionally has different semantics from normal code. Strict mode code and non-strict mode code can coexist, so scripts can opt into strict mode incrementally.

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