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The Scope of Variables in JavaScript

May 16, 2017436Yan Strunevskiy

Use strict mode
The “use strict” directive changes code into the mode that adheres to the up-to-date standard. It looks like the line “use strict” or ‘use strict’ and is placed at the beginning of the script:

Besides, the directive is used in functions. In such cases, a strict mode can be executed in function scope. The action “use strict” can’t be possibly canceled. It’s not supported by versions IE9 and older.
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The Scope of Variables in JavaScript

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