Javascript Array iteration, callbacks and function syntax

ArraysAndCallbacks.js

//ARRAY ITERATION METHODS USING AN ANONYMOUS CALLBACK

// const addOne = function(number){
//   return (number + 1)
// }

const arr = [1,2,3,4,5]

console.log(arr.forEach(function addOne(actualItem, indexOfItem, arrayWereGoingThrough){
  console.log('actual item: ', actualItem, 'index of item ', indexOfItem)
}))

  =======================================================
  
  //FILTER USING AN ANONYMOUS FUNCTION

// const isItThree = function(number){
//   return number % 2 === 0
// }

const arr = [1,2,3,4,5,3]

console.log(arr.filter(randomFn = function(number){
  return number % 2 === 0
}))

console.log('Calling randomFn outside filter ', randomFn(3))

==========================================================
  
  //FILTER USING AN ANONYMOUS FUNCTION

// const isItThree = function(number){
//   return number % 2 === 0
// }

const arr = [1,2,3,4,5,3]

console.log(arr.filter(randomFn = function(number){
  return number % 2 === 0
}))

console.log('Calling randomFn outside filter ', randomFn(3))

==========================================================
  
//REGULAR OLD BORING FUNCTION
const addOne = function(number){
  return number + 1
}

//ARROW FUNCTION W/O 'FUNCTION' WORD
const addOneArrow = (number, secondNumber) => {
  return secondNumber + 1
}

//ARROW FUNCTION W/0 PARENS
//*Only one parameter
const addOneArrowNoParens = number => {
  console.log('Hi')
  return number + 1
}

//ARROW FUNCTION W/O CURLIES
//Implicit return, only one statement
const addOneArrowNoCurlies = number => number + 1

console.log(addOneArrowNoCurlies(4))