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Why You Should Use JavaScript Single Var Pattern and How?

Why You Should Use JavaScript Single Var Pattern and How?

Not all novice developers are aware of all the language rules and conventions, and dealing with plenty of them can be frustrating for some novices. If you're one of them, then using JavaScript can help you provide flexibility to apply rules and conventions. One great example of this is that JavaScript makes it possible to create any sort of variable in a web page script. Certainly, this will relieve you from the stress of becoming familiar about all the rules and code conventions. But, this might result in adverse consequences if you are unable to handle it with caution.

However, you can work effectively with JavaScript variables using the “Single Var Pattern”. Want to know more about single var pattern and why you should use it? Reading this post further will help provide answers to all such queries.

Getting to Know About Single Var Pattern

The Single Var Pattern help create local variables in a function block using only a single var statement. Moreover, all those variables are separated using a comma, however the last variable ends with a semi-colon. Here's a simple code snippet with a function block that use the single var pattern:

function funcblock1() {
 var a = 1,
 b = “Welcome”,
 c = { name: "Stephen", age: 30 },
 d;
 }

The single var pattern can be written in a different formatting style as well, with comma-separators just before the variables, as you can see in the code below:

function funcblock1() {
 var   a = 1
 , b = "Welcome"
 , c = { name: "Stephen", age: 30 }
 , d;
}

You can choose to put commas either at the start of the line or at the end depending on your needs. But, it is recommended that you should prefer adding the commas at the end of each line. Doing so, will help you in reading 'var statements' with ease.

Is There an Alternative Way To the Single Var Pattern?

Yes, there is an alternative way that can be used instead of the single var pattern. The “multiple var statements” is a viable alternative to the single var pattern, since it helps declare all the variables just at the start of a function block. This helps prevent preventing logical errors and make the code easily readable.

Let's look at an example using multiple var statements:

function funcblock1() {
var a = 1;
var b = “Welcome”;
var c = { name: "Stephen", age: 30 };
var d; 
}

Why You Should Consider Using the Single Var Pattern?

Let us have a quick glance at the major reasons behind why you should use the single var pattern:

  1. Reduces the chances of logical errors: Since the single var pattern help declare all the variables in the beginning of a function block, it helps in reducing the possibility of logical errors like variable hoisting, or declaring unnecessary global variables, etc.
  1. Prevents any kind of confusion: Another great benefit of utilizing the single var pattern is that it helps find where a particular variable is located, which help in avoiding any confusion. Basically, the JavaScript single var pattern help in searching for all of the local variables at one single place.
  1. Help write less code: The single var statement help lessen the lines of code. Let's take an example to illustrate how the single var pattern help write lesser lines of code:

 

// This is a function that returns random integer number
var randomizer = function (f1, f2) {
var minimum = f1,
maximum = f2,
random = Math.random(),
result;
result = Math.floor(random * (maximum - minimum) + minimum);
return result;
 }
alert (randomizer(1,110));

When you'll use the single var pattern for writing the code, it slightly lessen the amount of code we need to write, as it avoids redundancy. Let's see how the above code can be written using the single var pattern:

// This function help return a random integer number
var randomizer = function (f1, f2) {
var minimum = f1,
maximum = f2,
random = Math.random(),
result = Math.floor(random * (maximum - minimum) + minimum);
return result;
}
alert(randomizer(1, 110));

In this code, the single var pattern is reducing the code by removing the redundant function: result().

Summing Up!

If you do not want to go through the hassle of having to learn all the rules and code conventions, then using JavaScript will help provide the flexibility to implement the rules as you deem perfect. But, working with JavaScript variables can cause issues. You can overcome such issues by using the single var pattern.

Reading the post will help you explore the benefits of the single var pattern and how it can be implemented.

Author biogrphy:

Jack Calder is a flawless expert who loves to slice psd to html files at a nice speed. Jack has been the marvelous website designer & developer in Markupcloud Ltd where he has achieved so many goals.

About John

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