6 Differences Between Arrow Functions and Regular Functions in JavaScript

Functions are an essential part of JavaScript that you need to use to write reusable code. The two main types of function are regular and arrow functions, and there are many ways to define them.

Even though they fill similar needs, they have a few critical differences that can fundamentally influence how you use them in your code. Learn all about several differences between arrow functions and regular functions.

The syntax you choose when developing JavaScript functions has a big impact on how simple it is to read and comprehend your code. The syntax of regular and arrow functions differ significantly, impacting how you write and use them.

JavaScript arrow functions use a smaller language structure that is more understandable. You can use them to create functions by combining them into a single expression or statement.

On the other hand, defining a regular function requires the use of the function keyword, with a more verbose syntax.

Regular functions are more useful for complex syntax requiring multiple statements or expressions. In contrast, arrow functions use a more concise syntax that can make your code easier to read and understand.

The term “scoping” describes how a function’s internal variables and functions are accessible. In JavaScript, you define and access variables and functions throughout your code using scoping. Their distinct scoping can significantly impact how you write and use JavaScript’s arrow and regular functions.

In scoping, how arrow functions handle the this keyword differs significantly from how normal functions do. Regular functions define the this keyword themselves; therefore, it can change depending on the context in which you invoke the function.

On the other hand, because they do not specify the this keyword, arrow functions use the same this as the static scope surrounding them.

Function binding is the term used to describe the relationship between this keyword and functions in your code. The variations in function binding between arrow functions and normal functions can strongly impact how you construct and use arrow functions.

Using the this keyword makes it unique in regular functions and associates with various objects based on the method used to call the function. Function binding is one of the most important distinctions between regular and arrow functions.

In contrast, arrow functions do not have this keyword; rather, they get it from the surrounding scopes.

Arrow function have an implicit return feature. If the function body consists of one single expression, the functions returns that expression.

Compatibility differences refer to the ECMAScript 6 added arrow functions, which may not work with older browsers or environments. On the other hand, regular functions have been around since the beginning of JavaScript and are widely supported.

Ultimately, JavaScript’s arrow and regular functions are powerful tools that help you write cleaner and more efficient code.

Source: MakeUseOf

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