The usual way to define JavaScript functions is using the function declaration or function expression:

// Function declaration
function greet(who) {
  return `Hello, ${who}!`;
}

// Function expression
const greetExpression = function(who) {
  return `Hello, ${who}!`;
};

But functions can be further improved. Making the syntax shorter (useful for writing short callbacks) and ease the resolving of this created a new type of functions named arrow functions.

#javascript #arrow function #function