The common mistakes programmers may make when programming in the JavaScript

Programming has a wide world in which lots of programming languages exist and each of which has their own fans, but there is a language that is more popular among programmers which is called "JavaScript programming language" it has more fans compared to the others and the number of them is increasing day by day, JavaScript has various features and provides the user with more facilities and the use of them allows the user to interact more with the content and causes the content to change from static to dynamic, which can be considered as the main reasons for this popularity, so that, user will  gain positive user experience while using the website  or program which is created with the help of this language, as a result, it is somehow the key to success due to the fact that when you can gain the users' satisfaction, they will introduce your website or program to their friends, so that the number of your website's visitors will increase day by day, which can help you  improve ranking of your website on Google search engine results page.

In this language,  programmers may make mistakes while programming, which may occur both by old and new ones. In this article, we will mention several common mistakes that may occur.

The common mistakes that programmers may make when programming in the JavaScript web programming language:

- The "+" Symbol can have many uses; for example, it may be used for Addition and Concatenation.

While coding, it is possible to ignore whether a number is written as a string or not, which eventually leads to similarities. As a result, you cannot see the desired result.

Programmers may sometimes forget that the data they have entered may be evaluated as a string, not a number, which can cause the data to join each other. As a result, no collective operations will be carried out.

This mistake is very common, so it is necessary to enter different data. When needed, numbers are entered in strings, and otherwise, they are entered numerically; now consider the following example for a better understanding.

 If you write out the code: var x = 10 + "7"; it goes up to "107,"

As you can see, the numbers 7 and 10 are only joined together, and because seven is written as a string, the two are not added together.

- Confusing the assignment (=) and equality (==, ===) operators, each of these items need to be used in their proper place and have a different meaning if you as a programmer, do not know where to use each of them, in the end, you cannot do the right programming.

When you want to compare two data, you need to use (==, ===) operators, the difference between the two is that three equals can make more accurate comparisons while two equals can perform a loose comparison in which only values ​​are compared, and the data type is no longer checked and compared, now consider the following example in this regard for a better understanding.

In this example, the variable number was assigned a string value of 1. It returns true when compared with 1 (of number type) using double equals because both values ​​are 1, but when compared using triple equals, it returns false because each value has a different data type.

One of the inevitable mistakes that can occur is memory leaks, which you can prevent by being aware of the issue and the factors that cause it to take place; now note the following code:

To understand everything better, you first need to know how things are working in  JavaScript  under the hood; the typical way that closures are implemented is that every function object has a link to a dictionary-style object representing its lexical scope, in a case that both functions defined inside replacing used prioritizing, it would be important that they both get the same object, even if priorThing gets assigned to over and over, so both functions share the same lexical environment, but as soon as a variable is used by any closure, it ends up in the lexical environment shared by all closures in that scope, and that little nuance is what leads to this gnarly memory leak, in addition to this, other things may eventually cause memory leaks that you need to be aware of to control them.

- Another mistake that may be made by various programmers, especially beginner ones, is that they do not do any planning and research for coding and rush into the coding step, which makes them write the code without a plan which can cause many mistakes to occur.

Before programmers start coding, it is necessary to carefully examine all the available items, check what input they need to have for the outputs which they are targeting, and then enter the coding stage so that there is no need to rush.

The steps that a programmer needs to take from the beginning include Writing, Validating, and modifying. Doing all the steps, respectively, can reduce the number of mistakes a programmer may make while programming.

Also, the point that needs to be mentioned in the event of a problem is to break the complex problems that have occurred into smaller problems and solvable parts so that you can solve the problems that have arisen easier than before because solving a complex problem will take more time and energy.

- Failure to make a backup while doing the work can cause you to lose track of time spent doing something and be forced to rewrite the code; for example, imagine that there was a problem with your system due to low physical security, and you had spent a whole month programming before the problem occurred. Still, due to the fact that you were unaware of the possible occurrence of such problems, you did not provide any backup, so you end up having to spend a lot of time doing what you have done before one more time.

This mistake is very common among novice programmers, and it is often seen that programmers have wasted all their efforts due to negligence; you have to learn to use source control (SVN or Git), Github, or you can use Dropbox, a cloud service, to save your work at any time.

- Do not underestimate your abilities, due to the fact that one of  the common mistakes that beginner programmers make  is that they underestimate all their talent and doubt all the code they have written, which can cause them to make many mistakes in the future and make some mistakes that can lead to bad results. Hence, it is necessary to have enough confidence to do all the things they know about this issue so that they can achieve the desired results.

Last word:

In general,  there are many mistakes that may occur by programmers while programming in JavaScript; in this article, we have dealt with a number of them and observed each case of clean coding with the help of this language, but you should always keep in mind that the best way to learn this language is to look at the examples in various articles, and after reviewing the examples, you need to practice a lot in order to correct your mistakes while coding to minimize the possibility of making them. As a result, you can get a good position among professional programmers to create valuable content and attract as many as users as you can in order to achieve your main goal.