Javascript is_null : Variable handling : PHP functions in JavaScript JAVASCRIPT TUTORIALS

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Javascript is_null

Returns true if variable is null

Example 1

Running
1.is_null('23');

Could return
1.false
Example 2

Running
1.is_null(null);

Could return
1.true

function is_null( mixed_var ){
    // Returns true if variable is null  
    // 
    // version: 810.114
    // 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 );
}

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