Javascript function_exists : Function Handling : PHP functions in JavaScript JAVASCRIPT TUTORIALS

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Javascript function_exists

Checks if the function exists

Example 1

Running
1.function_exists('isFinite');

Could return
1.true

function function_exists( function_name ) {
    // Checks if the function exists  
    // 
    // version: 810.114
    // discuss at: http://phpjs.org/functions/function_exists
    // +   original by: Kevin van Zonneveld (http://kevin.vanzonneveld.net)
    // +   improved by: Steve Clay
    // +   improved by: Legaev Andrey
    // *     example 1: function_exists('isFinite');
    // *     returns 1: true
    if (typeof function_name == 'string'){
        return (typeof window[function_name] == 'function');
    } else{
        return (function_name instanceof Function);
    }
}

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