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Javascript notes

What is the difference between call and apply? The difference is that  apply  lets you invoke the function with arguments as an array;  call requires the parameters be listed explicitly. A useful mnemonic is "A for array and C for comma." See MDN's documentation on  apply  and  call . Pseudo syntax: theFunction.apply(valueForThis, arrayOfArgs) theFunction.call(valueForThis, arg1, arg2, ...) Sample code: function theFunction ( name , profession ) { alert ( "My name is " + name + " and I am a " + profession + "." ); } theFunction ( "John" , "fireman" ); theFunction . apply ( undefined , [ "Susan" , "school teacher" ]); theFunction . call ( undefined , "Claude" , "mathematician" ); Map vs Object in JavaScript According to mozilla: A Map object can iterate its elements in insertion order - a for..of loop will return an array of [key, v...
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Redirection in javascript

How Page Re-direction works ? Example 1: This is very simple to do a page redirect using JavaScript at client side. To redirect your site visitors to a new page, you just need to add a line in your head section as follows: <head> <script type="text/javascript"> <!-- window.location="http://www.newlocation.com"; --> </script> </head> To understand it in better way you can  Try it yourself . Example 2: You can show an appropriate message to your site visitors before redirecting them to a new page. This would need a bit time delay to load a new page. Following is the simple example to implement the same: <head> <script type="text/javascript"> <!-- function Redirect() { window.location="http://www.newlocation.com"; } document.write("You will be redirected to main page in 10 sec."); setTimeout('Redirect()', 10000); //--> </script> </head> Here  ...
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