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Keywords: Javascript
2023-06-11 01:23:04 深夜i     --     --
Javascript

function, built-in, custom

How to Understand Functions in Javascript?

Functions are one of the most vital features in Javascript, which allows developers to encapsulate a block of code, invoke it multiple times, and pass data between the function and the calling program. In general, there are two types of functions in Javascript - built-in functions and custom functions.

Built-in Functions:

Javascript provides several pre-defined functions, such as parseInt(), parseFloat(), alert(), prompt(), confirm(), and so forth. These functions are built into the language and can be used without any further declaration.

Custom Functions:

Developers can also define their custom functions in Javascript, which are then available for use within the script. To define a custom function, developers use the keyword 'function' followed by a name and parentheses that may contain parameters. Then comes the block of code or statement enclosed in braces {} that needs to be executed when the function is invoked.

The main advantage of using custom functions in Javascript is code reusability, which means that the same code block can be used in different parts of the script multiple times. Also, custom functions allow developers to write modular and maintainable code that can be easily understood by other team members.

In conclusion, functions are an integral part of Javascript, and developers need to have a deep understanding of them to write efficient and scalable code. With built-in functions and custom functions, developers can perform diverse operations such as string manipulation, data conversion, user interaction, and much more.

  
  

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