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 programmers and new ones, in this article we will mention a number of common mistakes that may occur by them.

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.In fact, programmers may sometimes forget that the data which 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 that it is necessary to be careful in entering different data, so 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 7 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 datatype is no longer checked and compared, now consider the following example in this regard for a better understanding. 

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