How to solve following problem in JavaScript?

Question

We have an array that holds many web site names. Eg, www.google.com , www.msn.com , www.amazon.co.in , in.answers.yahoo.com, en.m.wikipedia.com, codehs.gitbooks.io,www.coderanch.com etc. Search for all sites that begin with “www” and display the total number of such sites. Eg. for the above, the total is 4.

I have tried using string.search() and string.match() methods and also used Regular Expressions but none of them worked. Can anyone help me out? I tried:

function myFun(){
                var arr = ["www.google.com", "www.msn.com", "www.amazon.co.in", "in.answers.yahoo.com", 
                            "en.m.wikipedia.com", "codehs.gitbooks.io", "www.coderanch.com"];
                
                var count = 0;
                var str= arr.toString();
                console.log(str);
                if(str == /www/g){
                    count ++;
                }
                document.write(count);
            }

Answer 1

 function myFun(){ let arr = [ "www.google.com", "www.msn.com", "www.amazon.co.in", "in.answers.yahoo.com", "en.m.wikipedia.com", "codehs.gitbooks.io", "www.coderanch.com" ]; let count = arr.reduce((c,i)=> { i.split(".")[0]==='www' && c++ ; return c; },0); document.write(count); } myFun();

Answer 2

     ```function searchWebsite(){
            var arr = ["www.google.com", "www.msn.com", "www.amazon.co.in", "in.answers.yahoo.com", "en.m.wikipedia.com", "codehs.gitbooks.io", "www.coderanch.com"];
            var count = 0;
            var pattern = new RegExp("www", "i");
            for(i=0;i<arr.length;i++){
                var result = pattern.test(arr[i]);
                if(result){
                count ++;
                 }
            }
            document.write(count);
        }