type char typescript

1var str = new String("This is string"); 
2console.log("str.charAt(0) is:" + str.charAt(0)); 
3console.log("str.charAt(1) is:" + str.charAt(1)); 
4console.log("str.charAt(2) is:" + str.charAt(2)); 
5console.log("str.charAt(3) is:" + str.charAt(3)); 
6console.log("str.charAt(4) is:" + str.charAt(4)); 
7console.log("str.charAt(5) is:" + str.charAt(5));