array.at()

itemList.stream()
          .filter(item -> item.getPropertyList()
                         .stream().anyMatch(property -> property.getKey().equals("Test")))
           .collect(Collectors.toList());

for (int i = 0; i < n; i++)
{
    if (valCount.ContainsKey(x))
        valCount[x]++;
    else
        valCount[x] = 1;
}

 const arr = ["This", "Little", "Piggy"];
const first = arr.slice(0, 1);
const the_rest = arr.slice(1);console.log(first); // ["This"]
console.log(the_rest); // ["Little", "Piggy"]                               
                                

$oneDimensionalArray = array_map('current', $twoDimensionalArray);

/*
current() function returns the value of the current element in an array. for ex : $fruits = array("banana", "apple", "orange"); echo current($fruits) //will return "banana" since current pointer is on index 0 which is banana
*/

function isEqual(arr1,arr2){
  let x = arr1.length;
  let y = arr2.lenght;
  
  //if lenght of array are not equal means array are not equal 
  if(x !=  y) return false;
  
  //sorting both array
  x.sort();
  y.sort();
  
  // Linearly compare elements
  for(let i=0;i<x;i++){
    if(x[i] != y[i]) return false
  }
  // If all elements were same.
    return true
}

let arrayOne = [3, 5, 2, 5, 2]
let arrayTwo = [2, 3, 5, 5, 2]

isEqual(arrayOne,arrayTwo) ? console.log("Matched") : console.log("Not Match")

const arr = ["Apple",45,"","google",null],,,,"facebook","",69]

const removeEle = arr.filter((el)=> return el !=null && el != "")

const arr = [333,1,2,11,22,3,4]
console.log(arr.sort())

arr.sort((a,b)=>a-b)

console.log(arr)

let items = [1,25,"JavaScript",69,"css","34","keep coding","html"];
console.log(items)

//shuffle array
function shuffle(arr){
  for(let i =arr.length-1;i>0;i--){
    const j = Math.floor(Math.random() * (i+1));
    [arr[i],arr[j]] = [arr[j],arr[i]];
  }
  return arr
}
console.log(shuffle(items))

//shuffle selected index 
const  itemToShuffle = items.slice(3,7);
console.log(shuffle(itemToShuffle))

//items after shuffling item from index 3 to 7
items = [items[0],items[1],items[2],...itemToShuffle,items[7]]
console.log(items)

let clickMe = document.querySelector('button');

function getRandomNumber(min, max) {
  let totalEle = max - min + 1;
  let result = Math.floor(Math.random() * totalEle) + min;
  return result;
}
function createArrayOfNumber(start, end) {
  let myArray = [];
  for (let i = start; i <= end; i++) {
    myArray.push(i);
  }
  return myArray;
}
let numbersArray = createArrayOfNumber(1, 10);

clickMe.addEventListener('click', () => {
  if (numbersArray.length === 0) {
    console.log('No more random number');
    return;
  }
  let randomIndex = getRandomNumber(0, numbersArray.length - 1);
  let randomNumber = numbersArray[randomIndex];
  numbersArray.splice(randomIndex, 1);
  console.log(randomNumber);
});

const array = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10];
const shuffledArray = array.sort((a, b) => 0.5 - Math.random());

// using Array map and Math.random
const shuffledArr = array => array.map(a => ({ sort: Math.random(), value: a })).sort((a, b) => a.sort - b.sort).map(a => a.value);

const shuffleArray = array => {
  for (let i = array.length - 1; i > 0; i--) {
    const j = Math.floor(Math.random() * (i + 1));
    const temp = array[i];
    array[i] = array[j];
    array[j] = temp;
  }
}

function shuffle(array) {
  const curIdx = array.length;

  // While there remain elements to shuffle...
  while (0 !== cur_idx) {
    // Pick a remaining element...
    const randIdx = Math.floor(Math.random() * curIdx);
    curIdx -= 1;

    // And swap it with the current element.
    const originalIdx = array[curIdx];
    array[curIdx] = array[randIdx];
    array[randIdx] = originalIdx;
  }
  return array;
}

// Usage of shuffle
const arr = [1, 2, 3, 4, 5, 6];
arr = shuffle(arr);
console.log(arr);

// shorter
function shuffle(array) {
    for (let i = array.length - 1; i > 0; i--) {
        var j = Math.floor(Math.random() * (i + 1));
        var originalIdx = array[i];
        array[i] = array[j];
        array[j] = originalIdx;
    }
}

//es6
function shuffle_array(array) {
    for (let i = array.length - 1; i > 0; i--) {
        const j = Math.floor(Math.random() * (i + 1));
        [array[i], array[j]] = [array[j], array[i]];
    }
}

Example: Shuffle Deck of Cards

// program to shuffle the deck of cards

// declare card elements
const suits = ["Spades", "Diamonds", "Club", "Heart"];
const values = [
  "Ace",
  "2",
  "3",
  "4",
  "5",
  "6",
  "7",
  "8",
  "9",
  "10",
  "Jack",
  "Queen",
  "King",
];

// empty array to contain cards
let deck = [];

// create a deck of cards
for (let i = 0; i < suits.length; i++) {
    for (let x = 0; x < values.length; x++) {
        let card = { Value: values[x], Suit: suits[i] };
        deck.push(card);
    }
}

// shuffle the cards
for (let i = deck.length - 1; i > 0; i--) {
    let j = Math.floor(Math.random() * i);
    let temp = deck[i];
    deck[i] = deck[j];
    deck[j] = temp;
}

console.log('The first five cards are:');

// display 5 results
for (let i = 0; i < 5; i++) {
    console.log(`${deck[i].Value} of ${deck[i].Suit}`)
}

//output
The first five cards are:
4 of Club
5 of Diamonds
Jack of Diamonds
2 of Club
4 of Spades

function remove(array, el) {
	const index = array.indexOf(el);
	if (index > -1) {
		const foundEl = array.splice(index, 1);
        return foundEl;
	}
    return undefined;
}
console.log(remove([2,5,9,1,5,8,5], 5))

function removeAllItems(arr, value) {
  var i = 0;
  while (i < arr.length) {
    if (arr[i] === value) {
      arr.splice(i, 1);
    } else {
      ++i;
    }
  }
  return arr;
}

console.log(removeAllItems([2,5,9,1,5,8,5], 5))