Coding Blog

HTML5 has a bunch of cool APIs. In one of my previous posts, I have written a simple demonstration of the Web Storage JavaScript API. In this post I will be showing another demonstration, the Web SQL Database JavaScript API. What is so fascinating about these APIs is they are “crash-safe.” Now you can lessen the load of your web servers and perform SQL tasks like, sorting, joining, etc. on the client side. Click [here] for the demonstration.

Let us say you have a list and you want to remove items while iterating through it if a certain condition satisfies. for (Object object : listOfObjects) { if (isConditionSatisfied) { listOfObjects.remove(object); } } What is wrong with this code above? Try it and you will get this, Exception in thread "main" java.util.ConcurrentModificationException You might want to do this instead, Iterator<Object> iterator = listOfObjects.iterator(); while (iterator.hasNext()) { Object object = iterator.next(); if (isConditionSatisfied) { iterator.remove(); } } Have a nice day.

Here is a simple demonstration of HTML5’s Web Storage. The code is quite straightforward. One thing to experiment is after entering any string and hitting save, try closing the browser entirely and opening it again visiting the same page to see if the data persisted. Click [here] for the demonstration.

It has been a while since I have written something about Javascript. You need to copy and paste this to your browser’s address bar to see how it works. javascript:R=0; x1=.1; y1=.05; x2=.25; y2=.24; x3=1.6; y3=.24; x4=300; y4=200; x5=300; y5=200; DI=document.getElementsByTagName("a"); DIL=DI.length; function A(){for(i=0; i-DIL; i++){DIS=DI[ i ].style; DIS.position='absolute'; DIS.left=(Math.sin(R*x1+i*x2+x3)*x4+x5)+"px"; DIS.top= (Math.cos(R*y1+i*y2+y3)*y4+y5)+"px"}R++}setInterval('A()',50); void(0); Enjoy!

Which one is faster? a == null or null == a ? This is the method of the former. public static boolean firstNullCheck(Object a) { if (a == null) { return true; } return false; } and the method of the latter. public static boolean secondNullCheck(Object a) { if (null == a) { return true; } return false; } Here’s the disassembly of the former. public static boolean firstNullCheck(java.lang.Object); Code: 0: aload_0 1: ifnonnull 6 4: iconst_1 5: ireturn 6: iconst_0 7: ireturn and the disassembly of the latter. public static boolean secondNullCheck(java.lang.Object); Code: 0: aconst_null 1: aload_0 2: if_acmpne 7 5: iconst_1 6: ireturn 7: iconst_0 8: ireturn The former saves you a bytecode. Anyone who can explain further since I am not sure whether if_acmpne is faster than ifnonnull ?

If you do not want your search queries to be compromised, use Google SSL . However, there is one thing I discovered though, if you click on a cached link, it’s not encrypted, it goes back to HTTP from HTTPS making the protected search useless. Just be aware.

Why are daily meetings important? Yes I know what you are thinking, to check if the schedule is on target, to spot showstoppers, roadblocks and whatnots. But aside from those, there are things that make daily meetings rewarding. Let’s face it, some people (including me) find it hard oftentimes to achieve a certain level of focus at work especially when multitasking is inevitable. Meetings will remind us of our commitments infront of our peers. Since most of us will be ashamed of not making any progress, it will trigger ourselves to do something about it. In my opinion, having daily meetings typically before the shift starts will help a lot of peers suffering from bad habits - procrastination. It is one way of invigorating those who have not found their way out yet. “Keep each other in the zone, what are teammates for?”