app.js

// Function #1: Array Slice;
const foods = ["pizza", "burger", "fingerChips", "donuts", "springRoll"]
const modifiedFood = foods.slice(
  foods.indexOf("pizza") + 1,
  foods.indexOf("springRoll")
)
console.log(modifiedFood)

//function  #2: Array Spliceconst
var foods1 = ["pizza", "burger", "fingerChips", "donuts", "springRoll"]
var modifiedFood1 = foods1.splice(2, 0, "noodles", "icecream")
console.log(foods1)

//Function #3: Filter
const numberArray = [12, 324, 213, 4, 2, 3, 45, 4234]

const isEvan = (numberArray) => {
  return numberArray.filter(function (number) {
    if (number % 2 === 0) {
      return number
    }
  })
}

var evenNumbers = isEvan(numberArray)
console.log(evenNumbers)

const isPrime = (numberArray) => {
  return numberArray.filter((number) => {
    for (var i = 2; i <= Math.sqrt(number); i++) {
      if (number % i === 0) return false
    }
    return true
  })
}

var primeNumbers = isPrime(numberArray)
console.log(primeNumbers)

//Function #4: Reject

var reject = {}
//Function #5: Lambda function
var evenNumbers1 = numberArray.filter((number) => {
  if (number % 2 == 0) return number
})
console.log(evenNumbers1)

//Function #6: Map

const myArray = [11, 34, 20, 5, 53, 16]

const findSquareOfNumbers = (myArray) => {
  return myArray.map(function (number) {
    return number * number
  })
}

var SquareOfNumbers = findSquareOfNumbers(myArray)
console.log(SquareOfNumbers)

//Function #7: Reduce

const myArray1 = [2, 3, 5, 10]

const multiply = (myArray1) => {
  return myArray1.reduce((a, b) => a * b, 1)
}

var multiplication = multiply(myArray1)
console.log(multiplication)