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];

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

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

function 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];

function 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];

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

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