Thanks Ming-Shiuan Tsai, your article was really clear and easy to understand, for those like me doesn't know about use strict :
Strict Mode was 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. More Info...
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Thanks Ming-Shiuan Tsai, your article was really clear and easy to understand, for those like me doesn't know about use strict :