Daily Archives: March 19, 2015

Function declaration vs Named function expression Javascript

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//Function declaration
function foo() { return 5; }

//Anonymous function expression
var foo = function() { return 5; }

//Named function expression
var foo = function foo() { return 5; }

function declarations loads before any code is executed.While function expressions loads only
when the interpreter reaches that line of code.

So if you try to call a function expression before it’s loaded, you’ll get an error

But if you call a function declaration, it’ll always work. Because no code can be called until all declarations are loaded.

Function Expression

  alert(foo()); // ERROR! foo wasn't loaded yet
  var foo = function() { return 5; }

Function Declaration

  alert(foo()); // Alerts 5. Declarations are loaded before any code can run.
  function foo() { return 5; }

The difference is in First case foo() is defined at run-time, whereas in second case foo() is defined at parse-time
for a script block

Extracting GMT Time for Day

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Getting GMT Time for the Day

 var strDate = new Date();

 hour = strDate.getUTCHours().toString();
 minute = strDate.getUTCMinutes().toString();
 second = strDate.getUTCSeconds().toString();

 if (hour.length == 1) { hour = "0" + hour; }
 if (minute.length == 1) { minute = "0" + minute; }
 if (second.length == 1) { second = "0" + second; }

 Cal.SetHour(hour); 
 Cal.SetMinute(minute); 
 Cal.SetSecond(second);