Array Snippets

let myArray = [1, 2, 3, 4, 5];
let valueToCheck = 3;

let containsValue = myArray.includes(valueToCheck);

console.log(`Includes ${valueToCheck} ==> ${containsValue}`);

let myArray = [1, 2, 3, 4, 5];
let itemToInsert = 9;

myArray.push(itemToInsert);
console.log(`Array: ${myArray}`);

function findMaxElement(arr) {
    if (arr.length === 0) {
        return "Empty array";
    }
    const maxElement = Math.max(...arr);
    return maxElement;
}

const args = process.argv.slice(2);

if (args.length > 1) {
    
    const numbers = args.map(i => parseInt(i));
    const maxNumber = findMaxElement(numbers);

    console.log("Array:", numbers);
    console.log("Max element:", maxNumber);

} else {
    console.log("Invalid amount of arguments");
}

node array_find_max_number.js 5 8 3 9 2

let myArray = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10];

let randomIndex = Math.floor(Math.random() * myArray.length);
let randomItem = myArray[randomIndex];

console.log(`Random item: ${randomItem}`);

const args = process.argv.slice(2);

if (args.length === 1) {

    let targetElement = parseInt(args[0]);

    if (!isNaN(targetElement) && targetElement >= 0) {
        let array = [2, 5, 9, 2, 5, 2];

        let indices = [];
        let idx = array.indexOf(targetElement);

        while (idx != -1) {
            indices.push(idx);
            idx = array.indexOf(targetElement, idx + 1);
        }

        console.log(indices);
    } else {
        console.log("Invalid target element");
    }
} else {
    console.log("Invalid amount of arguments");
    console.log("Provided:", args.length);
    console.log("Expected: 1");
}

node array_find_all_indexes.js 2

let arrayOne = [1, 2, 3, 4, 5];
let arrayTwo = [3, 4, 5, 6, 7];

let intersection = arrayOne.filter(v => arrayTwo.includes(v));

console.log("Intersection:", intersection);

let items = ["One", "Two", "Three"];
let deletedItem = items.pop();

console.log(deletedItem);
console.log(items);

let emptyArray = [];
let deletedItem = emptyArray.pop();

console.log(deletedItem);
console.log(emptyArray);

let originalArray = [1, 2, 3, 4, 5];
let itemToRemove = 3;

let indexToRemove = originalArray.indexOf(itemToRemove);
if (indexToRemove !== -1) {
    originalArray.splice(indexToRemove, 1);
}

console.log(`Original array: ${originalArray}`);

const nums = [1, 2, 3, 4, 5];
const numsReversed = nums.reverse();

console.log(nums);
console.log(numsReversed);
console.log(nums === numsReversed);

function reverseString(str) {
    return str.split('').reverse().join('');
}

console.log(reverseString("Hello"));

let items = [100, 200, 300, 400];
let deletedItem = items.shift();

console.log(deletedItem);
console.log(items);

function chunkArray(array, chunkSize) {
    let result = [];
    for (let i = 0; i < array.length; i += chunkSize) {
        result.push(array.slice(i, i + chunkSize));
    }
    return result;
}

let myArray = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10];
let chunks = chunkArray(myArray, 3);

console.log("Original:", myArray);
console.log("Chunks:", chunks);

// Function - Creating standard deck of cards
function createDeck() {
    const suits = ["Hearts", "Diamonds", "Clubs", "Spades"];
    const ranks = ["2", "3", "4", "5", "6", "7", "8", "9", "10", "Jack", "Queen", "King", "Ace"];

    let deck = [];

    for (let suit of suits) {
        for (let rank of ranks) {
            deck.push(`${rank} of ${suit}`);
        }
    }

    return deck;
}

// Function - Shuffle deck of cards
function shuffleDeck(deck) {
    for (let i = deck.length - 1; i > 0; i--) {
        const j = Math.floor(Math.random() * (i + 1));
        [deck[i], deck[j]] = [deck[j], deck[i]];
    }
}

// Create & display initial deck
const initialDeck = createDeck();
console.log("Initial deck");
console.log(initialDeck);

// Shuffle the deck
const shuffledDeck = [...initialDeck];
shuffleDeck(shuffledDeck);
console.log("\nShuffled deck");
console.log(shuffledDeck);