Strict mode in Javascript

Question

I am currently learning Javascript and came across the term "strict mode". I know that it is used to indicate to the compiler that the code should be examined stricter. Then I went on testing this: first I tried this:

function test() { "use strict"; a = 4; alert(a); }

I didn't get an alert and thought that it is quite logical as an error is thrown because "a" is not defined. Then I tried this:

{ "use strict"; a = 4; alert(a); }

After refreshing the page an alert was shown saying "4". So my question is when is the strict mode "working" and when it isn't?

AKX · Accepted Answer · 2018-05-30 13:24:07Z

Quoting the MDN page on strict mode:

Strict mode applies to entire scripts or to individual functions. It doesn't apply to block statements enclosed in {} braces; attempting to apply it to such contexts does nothing.

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