// useful for HtmlCollection, NodeList, String types

function forEach(array, callback, scope){for (var i=0,n=array.length; i<n; i++)callback.call(scope, array[i], i, array);} // passes back stuff we need

​

function countVowels(input)

{

    var vowels = 'aeiou', result = 0;

    forEach( input, function(char){ if (vowels.indexOf(char) != -1) result++; } );

    return result;

}

countVowels("goes");

function VowelCount(str) { 

    var pattern = /[aeiou]/i;

    var vowelCount = 0;

​

    for (var i = 0; i < str.length; i++) {

        if (pattern.test(str[i])){

            vowelCount++;

        }

    }

    return vowelCount; 

}

​

VowelCount("goes")