Arrays-operation created by ippaiva - https://repl.it/@ippaiva/Arrays-operation

__replit_main__

//Getting the last Index
var animalArray = ["Dog", "Cat", "Fish"];

// Notice, it's the length - 1
// The array's index starts at 0, and we must compensate
var lastIndex = animalArray.length - 1;
var lastElement = animalArray[lastIndex];
console.log(lastElement);


//Push Method --> add at the end of array
var animalArray = ["Dog", "Cat", "Fish"];
animalArray.push("Lizard");
console.log(animalArray);

//Adding at a Specific Position in an Array
var animalArray = ["Dog", "Cat", "Fish"];
console.log("Original: " + animalArray);

animalArray[6] = "Turtle";
console.log("Adding some element: " + animalArray);

animalArray[2] = "Snake";
console.log("Updating some element: " + animalArray);

//Unshift Merthod -->Add at the beginning of array
var animalArray = ["Dog", "Cat", "Fish"];
animalArray.unshift("Whale");
console.log(animalArray);

//Slice Method -->defines the index you want to delete, second defines how many items will be deleted from this position.

var animalArray = ["Dog", "Cat", "Fish", "Lizard", "Whale", "Cheetah"];
console.log("Original: " + animalArray);
console.log("------");

// "From the first element, remove one going forward"
animalArray.splice(0, 1);
console.log(animalArray);

//  "From the second element, remove two going forward"
animalArray = ["Dog", "Cat", "Fish", "Lizard", "Whale", "Cheetah"];
animalArray.splice(2, 2);
console.log(animalArray);

// If we pass a third argument
// It is inserted as the replacement
animalArray = ["Dog", "Cat", "Fish", "Lizard", "Whale", "Cheetah"];
animalArray.splice(0, 1, "Something else");
console.log(animalArray);

//Exercise 1: Add two animal at the end of array.
animalArray = ["Dog", "Cat", "Fish", "Lizard", "Whale", "Cheetah"];
animalArray.push("bunny","goat");
console.log(animalArray);
console.log("------");

//Exercise 2: Remove the last two animals of the end of array.
animalArray.splice(0,2);
console.log(animalArray);
console.log("------");

//Exercise 3 : Replace last animal with the word "Last".
animalArray.splice(5,1,"last");
console.log(animalArray);
console.log("------");



//For Loop through array
 var animalArray = ["Dog", "Cat", "Fish"];
 
for (var i = 0; i < animalArray.length; i++){
  console.log(animalArray[i]);
}
console.log("------");

//while loop through array
var counter = 0;
var animalArray = ["Dog", "Cat", "Fish"];

while (counter < animalArray.length){
console.log(animalArray[counter]);
  counter++;
}
console.log("------");

//forEach is an array method that iterates through each element of the array.
var animalArray = ["Dog", "Cat", "Fish"];

animalArray.forEach(function(animal){
  console.log(animal);
});
console.log("------");


//ForEach Exercise: Create an array with 6 of your favorite foods.
//With the loop of your choice
//but only print out the foods with an even index.

var favFood = ["Oyster","Salmon","Ribs","fried eggs","Chocolate","Salami" ];
for(var i = 0; i < favFood.length; i++){
  if(i % 2 === 0) {
  console.log(favFood[i]);
 }
}
console.log("------");

//Sum of Array
//Create a variable to hold the total.
//Create an array of numbers. 
//Iterate over each element in the array with a  for loop.
//In the for loop, add each element of the array to the sum. As you iterate over each number, take the value and add it to the sum.
// Print the sum
//The final sum should be 29.

//Avarage of array
//After summed the array, divide the sum by the total number of elements in the array and assign this to a var average
//The average should be: 8.1666.

var sum = 0;
var numbers = [1, 7, 4, 11, 16, 10];


// Add each number in the array to the sum
for(var i = 0; i < numbers.length; i++){
 sum +=numbers[i];
}
console.log("The sum is: " + sum);
console.log("The avarage is : " + sum / numbers.length);

console.log("------");


//Find the Largest
//Create a variable to hold the current largest number called currentLargest. Before you iterate over the array, the value will be null.
//Iterate through the array. For each number in the array, compare it to currentLargest.
//If the iterated number is greater than currentLargest, it is the new currentLargest.
//If it’s less than the currentLargest, nothing happens

var currentLargest = null;
var smallestNumber = 0;
var numbers = [10, 16, 99, 2, 52, 41, 7];

for (var i = 0; i < numbers.length; i++){
  if ( numbers[i] >  currentLargest ){
currentLargest = numbers[i];
 } 
}
console.log("The largest number is: " + currentLargest);