Anonymous Functions

Nameless functions.

// Regular function.
function hello() {
  alert('Hello world!')
}

// Function assigned to a variable.
const hello = function() {
  alert('Hello world!')
}

// Anonymous function.
const hello = () => {
  alert('Hello world!')
}

// Regular function used as a callback.
setTimeout(hello, 1000)

// Anonymous function used as callback.
setTimeout(() => {
  alert('Hello world!')
}, 1000)