Home - News ( United States | United Kingdom | Italy | Germany ) - Football scores

Showing content from https://webplatform.github.io/docs/javascript/directives/use_strict below:

use strict · WebPlatform Docs

Restricts the use of some potentially-harmful features of JavaScript (e.g., eval, with) and throws syntax errors for certain sloppy code.

"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 = testFunction();

The following code causes a syntax error because in strict mode all variables must be declared with var. Even though the strict mode directive (use strict;) is only added to the function, the whole code breaks because that function does not adhere to the strict mode rules.

function testFunction(){
   
   "use strict";
   
   testvar = 4;
   return testvar;
}
var hello = true;

The following code _does not_ cause a syntax error, even though the variable intvar variable is not declared with var, because the strict mode is scoped to the function only, while the non conformant code is found in a different scope (the global scope).

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





intvar = 1;

When the expression "use strict"; is placed at the start of a script or a function body, the code contained in it is parsed under stricter rules than what the default JavaScript language allows. These rules include:

• Variables must be explicitly declared (var).
• Statements must end with a semicolon (;).
• Assigning values to a read-only property fails (Node.DOCUMENT_FRAGMENT_NODE = 9;).
• with statements are completely disallowed.

TODO: Add the complete set of strict mode rules.

• Microsoft Developer Network: Windows Internet Explorer JavaScript reference Article

RetroSearch is an open source project built by @garambo | Open a GitHub Issue

Search and Browse the WWW like it's 1997 | Search results from DuckDuckGo

HTML: 3.2 | Encoding: UTF-8 | Version: 0.7.4