JavaScript is_null

Returns true if variable is null

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function is_null (mixed_var) {
    // Returns true if variable is null  
    // 
    // version: 1008.1718
    // discuss at: http://phpjs.org/functions/is_null    // +   original by: Kevin van Zonneveld (http://kevin.vanzonneveld.net)
    // *     example 1: is_null('23');
    // *     returns 1: false
    // *     example 2: is_null(null);
    // *     returns 2: true    return ( mixed_var === null );
}

Examples

» Example 1

Running

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is_null('23');

Should return

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false

» Example 2

Running

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is_null(null);

Should return

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true

Dependencies

No dependencies, you can use this function standalone.

Open syntax issues

php.js uses JsLint to help us keep our code consistent and prevent some common bugs.

Eventually we want all code to pass or at least take into consideration most fixes suggested by JsLint, following this JsLint configuration we’ve decided on.

Authors

Thanks to the following developers, you get to have is_null goodness in JavaScript.

• Kevin van Zonneveld ( original )

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[/CODE]

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