AdvertisementMicrosoft Excel is a very capable data analysis tool already, but with the ability to Our code template will help you set up automated emails from within Excel using Collaboration Data Objects (CDO) and VBA scripts. By writing simple code in (VBA), it’s that much more powerful. However, used incorrectly, VBA can cause a lot of problems.Even if you’re not a programmer, VBA offers simple functions that allow you to add some really impressive functionality to your spreadsheets, so don’t leave just yet!Whether you’re a VBA guru, Would you like to turn your Google Drive account into an intelligent weather analysis system, and live out a Star Trek fantasy? Ok!, or a newbie, who only knows how to write simple scripts that do basic cell calculations, you can follow easy programming techniques, that will help you improve the odds of writing clean and bug-free code. Getting Started with VBAIf you haven’t programmed in VBA in Excel before, enabling the Developer tools to do so is actually pretty easy. Just go to File Options and then Customize Ribbon. Just move the Developer command group from the left pane over to the right.Make sure the checkbox is enabled, and now the Developer tab will appear in your Excel menu.
The easiest way to get into the code editor window at this point is just to click on the View Code button under Controls in the Developer menu. Horrible Variable NamesNow that you’re in the code window, it’s time to start For those of you that would really love to be able to write your own application, but have never typed a single line of code before, I'm going to walk you through making your very. The first important step in most programs, whether it’s in VBA or any other language, is defining your variables.Throughout my couple of decades of code writing, I came across many schools of thought when it comes to variable naming conventions and learned a few things the hard way. Here are the fast tips for creating variable names. Make them as short as possible.
Make them as descriptive as possible. Preface them with variable type (boolean, integer, etc). Remember to use the right scope (see below).Here’s a sample screenshot from a program that I use often to make WMIC Windows calls from Excel Excel and 10 minutes of work will give you more detailed information about your computer than you ever thought possible. Sounds too good to be true? That's Windows, if you know how to use it.When you want to use the variables inside of any function inside of the module or object (I will explain this below), then you need to declare it as a “public” variable by prefacing the declaration with Public. Otherwise, variables get declared by prefacing them with the word Dim.As you can see, if the variable is an integer, it’s prefaced with int.
If it’s a string, then str. This helps later on while you’re programming because you’ll always know what type of data the variable holds, just by glancing at the name. You’ll also notice that if there’s something like a string that holds a computer name, then the variable is called strComputerName. Avoid making very convoluted or confusing variable names that only you understand. Make it easier for another programmer to come behind you and understand what it all means!Another mistake people make is leaving sheet names as the default “Sheet1”, “Sheet2”, etc This adds further confusion to a program. Instead, name the sheets so that they make sense.This way, when you refer to the sheet name in Its integration with Windows allows control of Internet Explorer in a number of surprising ways using Visual Basic for Applications (VBA) script from any application that supports it, such as Word, Outlook or Excel., you’re referring to a name that makes sense. In the example above, I have a sheet where I pull in Network information, so I call the sheet “Network”.
Now in the code, any time I want to reference the Network sheet, I can do it quickly without looking up what sheet number it is. Breaking Instead of LoopingOne of the most Everything important that you need to know about living a successful life, you can get from a computer program. Don't believe me? When they start writing code is properly dealing with loops.
And since so many people who use Excel VBA are very much code newbies, poor looping is epidemic.Looping is very common in Excel because often you are processing data values down an entire row or a column, so you need to loop to process all of them. New programmers often want to just break out of a loop (either a For loop or a While look) instantly when a certain condition is true.You can ignore the complexity of the code above, just note that inside the inner IF statement, there’s an option to exit the For loop if the condition is true. Here’s a simpler example: For x = 1 To 20If x = 6 Then Exit Fory = x + intRoomTempNext iNew programmers take this approach because it’s easy.
When a condition occurs that you’re waiting for in order to quit a loop, the temptation to just immediate jump out of it is strong, but don’t do it.More often than not, the code that comes after that “break” is important to process, even the last time through the loop before exiting. A much cleaner and more professional way to handle conditions where you want to leave a loop halfway through, is just to include that exit condition in something like a While statement. While (x=1 AND x6)For x = 1 To 20y = x + intRoomTempNext iWendThis allows for a logical flow of your code, with the last run through when x is 5, and then gracefully exiting once the For loop counts up to 6. No need to include awkward EXIT or BREAK commands mid-loop. Not Using ArraysAnother interesting mistake that Having introduced and talked a little about Object Oriented Programming before and where its namesake comes from, I thought it's time we go through the absolute basics of programming in a non-language specific way. Make is trying to process everything inside of numerous nested loops that filter down through rows and columns during the calculation process.While this can work, it could also lead to major performance problems, if you constantly have to perform the same calculations on the same numbers in the same column.
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Looping through that column and extracting the values every single time is not only tedious to program, it’s a killer on your processor. A more efficient way to handle long lists of numbers is to utilize an array.If you’ve never used an array before, have no fear. Imagine an array as an ice cube tray with a certain number of “cubes” you can put information into. The cubes are numbered 1 to 12, and that’s how you “put” data into them.You can easily define an array just by typing Dim arrMyArray(12) as Integer.This creates a “tray” with 12 slots available for you to fill up.Here’s what a row looping code without an array might look like: Sub Test1Dim x As IntegerintNumRows = Range('A2', Range('A2').End(xldown)).Rows.CountRange('A2').SelectFor x = 1 To intNumRowsIf Range('A' & str(x)).value.