Using the Rest Parameter
Explore how to use rest parameters in JavaScript functions to handle variable numbers of arguments more clearly and efficiently. Learn the advantages over the traditional arguments object, code conciseness, and key rules for effective use. This lesson helps you write cleaner and more expressive functions by leveraging this modern feature.
A rest parameter is defined using ellipsis (...) to signify that that parameter is a placeholder for any number of arguments.
How the rest parameter is better than arguments
The rest parameter directly addresses the issues with arguments.
- First, it stands for the rest of the parameters and is highly visible in the parameter list.
- Second, the rest parameter is of
Arraytype.
The rest parameter in action
Let’s convert the max() function from the previous example to use a rest ...