Understanding how a JavaScript engine works is fundamental to grasping the performance and behavior of JavaScript code, both in the browser and on the server side with Node.js. Especially if you are looking for performance enhancements of your code. However, this may be a bit more than is needed for simple applications, where you only…
JavaScript is similar to other C/C++ style languages in its syntax, although it has moved further from it as goes through its own revisions. However, the basics of the language have stayed the same. Case Sensitivity JavaScript is a case sensitive language, unlike some other contemporary languages that were in the web sphere at the…
Several languages have closures, but you will most often hear of them within JavaScript because when defining variables, you don’t always have a good way to handle scope or static properties. Specifically, it is a form of lexical scoping. This is used to preserve variables from the outer scope of a function in the inner…
JavaScript introduced the class syntax in 2015 to create objects, resembling patterns found in Java and C++. A class includes a constructor method to initialize properties. JavaScript lacks public and private property enforcement, necessitating best practices. Methods can be added without the function keyword. Constructor overloading isn’t supported, but default values can be assigned.
Loops in JavaScript work the same way as they do in most other languages, especially those in the C family of languages. You have traditional condition loops, – while and do-while, and a for counting loop. These are the most common forms of a loop. JavaScript also supports several additional loops that are specific to…
You can create functions in different ways in Javascript. Now a function in JavaScript works similar to any other language where it allows you to break out of the normal flow of your code, and then run a separate block of code. Calling a JavaScript Function Calling a JavaScript function is the same as it…
JavaScript’s conditional operators are like those in most C/C++ styled languages. Assume that x = 5 in the series of statements below: Operator Description Comparing Returns == equal to x == 7 false x == 5 true x == “5” true != not equal to x != 8 true x != 5 false > greater…
JavaScript is a dynamically typed language, which means that it assigns the type based upon how it is used. The data type can change as values, and their types, change as the program executes. Without care of the data types, this can cause errors to occur. Consider the following code: We can test this theory…
