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use strict Directive

JavaScript - Internet Explorer 10

Restricts the use of some features in JavaScript. Supported in Internet Explorer 10 and Windows Store apps only.

use strict

The following code causes a syntax error because in strict mode all variables must be declared with var.

"use strict";
function testFunction(){
   var testvar = 4;
    return testvar;
}
intvar = 5;

Strict Mode (JavaScript)

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