funWithFunctions.js

// Simple function definition
function function01() {
  console.log('This is function #1')
}

// Function expression
const fnExpression = () => {
  console.log('This is an function epression example')
}

// You can use functions as parameters
function fnReceivingAFnAsAParameter(fnParam) {
  fnParam()
}

// Just to made the output prettier
function separator() {
  console.log('------------------------------------')
}

separator()
function01()
separator()
fnExpression()
separator()
fnReceivingAFnAsAParameter(function01)
separator()
fnReceivingAFnAsAParameter(function () {
  console.log('Function receiving a function on the fly')
})
separator()