Enhanced version of switch

switch-enhanced.js

var x = 'b';
var y = 'd';
var caseHandlers = {
    'a': caseHandlerMethod1,
    'b': caseHandlerMethod2,
    'c': caseHandlerMethod3,
    'default': defaultHandlerMethod
};

switch2(caseHandlers,x);
switch2(caseHandlers,y);

function switch2(caseHandlingMap, val) {
  // Case Matched to Handler
  if (typeof caseHandlingMap[val] !== 'undefined') {
    return caseHandlingMap[val]();
  }
  // None Matched, but Default Handler Available
  else if (typeof caseHandlingMap['default'] !== 'undefined') {
    return caseHandlingMap['default']();
  }
  // None Matched, No Default Handler Available
  else {
    return -1;
  }
}

function caseHandlerMethod1 (val) { console.log('Handler 1 Invoked on value:', val); }
function caseHandlerMethod2 (val) { console.log('Handler 2 Invoked on value:', val); }
function caseHandlerMethod3 (val) { console.log('Handler 3 Invoked on value:', val); }
function defaultHandlerMethod (val) { console.log('Default/Fallback Handler Invoked:', val); }