In JavaScript, functions are quite particular as they can be assigned to variables, passed as arguments to other functions, and returned from other functions.

Depending on which scenario they are used in, functions have different purposes and names.

Recursive functions

A recursive function is a function that calls itself in order to solve a problem that can be broken down into smaller problems.

function recursive(parameter, result) {  if (baseCase) {    return result;  } else {    // modify parameter    // modify result    return recursive(parameter, result);  }}

It essentially includes:

1. A base case, which is the condition under which the function stops calling itself in order to prevent infinite recursion.
2. A recursive case, which is the condition under which the function calls itself with modified arguments, progressing towards the base case.