Javascript — Advanced Functions

Advanced function techniques include closures (functions retaining access to their lexical scope), higher-order functions (functions that take or return other functions), recursion (functions calling themselves), and arrow functions (concise syntax and different 'this' binding). These empower cleaner, modular code.

const add = (a, b) => a + b;
function factorial(n) {
  if (n <= 1) return 1;
  return n * factorial(n - 1);
}