searching for the cookie value by giving cookie key value

cookiesearch.js

//cookie Search if many cookies exist 
function getMyCookie(key)
{
var cook =  document.cookie.split(";"); 
var str ;
var vals = new Array();
for(var x = 0 ; x < cook.length ; x++ )
{
 var temp = cook[x].split("=");
for(var y = 0 ; y < temp.length ; y++)
{
 vals.push(temp[y]);
}
}

for(var x = 0 ; x < vals.length ; x++ )
{
 if( key.toString() === vals[x] ) 
   return vals[x+1];
}
}
var val = getMyCookie("rollno");
console.log(val);

//cookie search if only one cookie exists 

var cook =  document.cookie.split("="); 
console.log(cook); 
function mycookiesearch(str)
{
   for(var x = 0 ; x < cook.length ; x++)
   {
    if(cook[x] == str ) 
      { 
        return cook[x+1] ;
      } 
  } 
}
 mycookiesearch("rollno");