Functions in JavaScript. 5B

A function in JavaScript is a reusable block of code that performs a specific task. All functions have a name, arguments, and a code block.

Calling a function executes the code contained within the function. This means the code inside the function will be run and any return values will be outputted when the function is finished running.

Passing a function argument refers to supplying a function with the data it needs to execute. This data is typically supplied in the form of values that are passed as parameters to the function. By passing arguments to a function, the function can be more versatile and dynamic as it can take different data values each time it is called.

The return keyword is used to return a value or data from a function. It can be used to explicitly return a value to the caller of the function, or to end the execution of the function and return control to the caller of the function. Additionally, it allows you to immediately terminate the function execution and provide a value or data to the caller.