7 mistakes every JavaScript developer should avoid!!!


Today, JavaScript is utilized generally by software engineers for creating both web applications and portable applications. JavaScript has been rising as one of the most favored programming languages for building extensively scaled web applications. JavaScript, alongside HTML5 and CSS3, help designers to make sites available on both the PCs and cell phones with the same code base. The full stack web designers favor building customer side and server-side code in JavaScript. The engineers likewise have the choice to quicken custom application advancement by exploiting different JavaScript libraries, systems, and improvement instruments.

The keen web engineers implement innovative approaches to maintain the web applications optimally and to convey ideal client participation by composing high standard JavaScript code. They execute different JavaScript programming tips and best practices to compose perfect, discernable, and viable code. In any case, numerous JavaScript designers frequently influence the code quality by conferring some straightforward slip-ups. These JavaScript regular mix-ups even require the software engineers to put additional time and push to scrutinize the code. Consequently, it winds up fundamental for web engineers to do mindful programming and maintain a strategic distance from these common JavaScript mistakes.

1. Proper usage of ‘=’ and ‘==’ operators

The improper usage of comparison operator (==) and assignment operator (=) is a commonly found mistake with many programmers. A programmer should always keep in mind that assignment operator assigns value to a variable while comparison operator is used to compare values of variables on some specified conditions. Logical error occurs when the programmer interchanges these similar looking operators, either not noticing or on confusion.

2. Multi-purpose usage of ‘+’ symbol

The symbol + is used for two different purposes in JavaScript programming language. One instance is concatenating, which is the joining of two strings. Another instance is the use of addition operator to add numerical data. For example, when the programmer joins both string and whole number inputs, the function may not succeed in identifying them. The developer can take care to avoid this mistake with use of parselnt( ) function, which converts the string values into integer.

3. Specifying Array Objects with Named Indexes

This has to be avoided as JavaScript, unlike other programming languages, needs to define array with numeric integer index. The programmers need to allocate values to each discrete components of an array by referring to their numeric index. Many developers utilized named indexes instead of this. Mostly it results in wrongly defining the values.

4. Forgetting to check of undefined objects

JavaScript allows a programmer to declare the value of a variable as null. Yet, the scripting language sets the variable value as undefined by the use of null. In the same way, by default, it keeps the value of object as null. Blame it on the JavaScript for it does not check whether an object is defined null. The programmers have to make sure the object is not undefined, when by default it is defined null. It is advised to check for this before performing any calculations or while writing the code.

5. Using unidentifiable variable names

In most programming language coders are allowed to use type-specific variables, while JavaScript uses dynamic type variable declaration. By declaring a variable name as ‘abc’, it cannot be identified if it is using string or integer value. Consider the case of declaring a variable as ‘rollNum’ and the programmer can easily identify the type as an integer. This is very helpful in editing and implementing codes thereby avoiding confusion among programmers who work on the same code.

6. Loading done before referencing code

The web browser executes JavaScript code in the order in which they show up in the source record. Subsequently, coders need to guarantee that the particular code is stacked before being referenced. The programmers can find a solution to this basic JavaScript error in various ways. They can quicken code execution by putting the JavaScript code toward the finish of the source HTML record just before the </body> tag. Moreover, they can consider putting the whole JavaScript code in one function, and call that function through the onload function of the <body> tag.

7. Increase code readability with semicolons

The more quick-witted JavaScript software engineers keep the code intelligible by utilizing semicolons. There are amateurs who frequently misunderstand the semicolons to influence the web application's execution. They utilize commas rather than semicolons while connecting code into one unique line. Studies demonstrate that neither utilization of additional semicolons nor extra variable declaration influences the JavaScript code execution speed.

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