Switch is not an If-Else - JavaScript

switch-example.js

function _t(){
    var result = "null";
    switch ("A") {
        case "A": {
            result += "A";
        }

        case "B":  {
            result += "B"; 
        }
        case "C": {
            result += "C";
            break;
        }
        default:
            result += "default";
    }
    return result;
}

//Guess what result is
console.log("Result was: " + _t());