Comparing Items within an Array in Javascript

Question

Comparing Items within an Array in Javascript

Forgive me if this comes across as quite basic, but I am a complete beginner when it comes to coding (though I am determined to improve!)

I am working on creating a straightforward higher or lower card game using JavaScript where the user has to guess whether the next card will be higher or lower than the current card shown.

Currently, I have an array of 52 cards and I am utilizing Math.random to select a random card from the array.

My goal is to compare the values of two cards, but I am uncertain about the approach I should take. I suspect that indexOf might be involved, but I am not certain.

Thank you very much, and I apologize if this question is off-topic or has been asked before!

If it helps, here is my array:

function randomCard()
{
var cardArray = ["Club0.jpg","Club1.jpg","Club3.jpg","Club3.jpg","Club4.jpg","Club5.jpg","Club6.jpg","Club7.jpg","Club8.jpg","Club9.jpg","Club10.jpg","Club11.jpg","Club12.jpg","Diamond0.jpg","Diamond1.jpg","Diamond2.jpg","Diamond3.jpg","Diamond4.jpg","Diamond5.jpg","Diamond6.jpg","Diamond7.jpg","Diamond8.jpg","Diamond9.jpg","Diamond10.jpg","Diamond11.jpg","Diamond12.jpg","Heart0.jpg","Heart1.jpg","Heart2.jpg","Heart3.jpg","Heart4.jpg","Heart5.jpg","Heart6.jpg","Heart7.jpg","Heart8.jpg","Heart9.jpg","Heart10.jpg","Heart11.jpg","Heart12.jpg","Spade0.jpg","Spade1.jpg","Spade2.jpg","Spade3.jpg","Spade4.jpg","Spade5.jpg","Spade6.jpg","Spade7.jpg","Spade8.jpg","Spade9.jpg","Spade10.jpg","Spade11.jpg","Spade12.jpg"];

var pickCard = cardArray[Math.floor(Math.random() * cardArray.length)];
document.getElementById("card").src = pickCard;
}

javascript arrays compare

Answer 1

Answer №1

In my opinion, the issue lies not in your understanding of arrays and looping, but in how you structure your question before diving in. Currently, you have an array setup as follows:

var cardArray = ["Club0.jpg","Club1.jpg","Club3.jpg"...];

This approach may be complicating things unnecessarily for you, especially if you plan on performing numerical comparisons on these array elements. Instead, consider framing your problem statement more clearly like this:

"I am dealing with 4 suits of cards, each containing values from 1 to 13 (with Jack as 11, Queen as 12, King as 13, and Aces treated as low)."

To better tackle this scope, let's begin by creating a deck comprising four suits with 14 cards each.

var deck = {
  heart: [1,2,3,4,5,6,7,8,9,10,11,12,13],
  club: [1,2,3,4,5,6,7,8,9,10,11,12,13],
  spade: [1,2,3,4,5,6,7,8,9,10,11,12,13],
  diamond: [1,2,3,4,5,6,7,8,9,10,11,12,13]
};

We will also need an array to store the suit names for easy access to the object.

var suits = ['heart','club','spade','diamond'];

Next, we introduce memo, which is crucial for avoiding duplicates when drawing cards. It serves as a record of selected cards that we can refer back to.

var memo = [];

The key function here is drawRandomCard. It randomly selects a suit from our array of suits and a number from the corresponding suit's array. If the chosen card is found in memo, a new card is drawn; otherwise, it is added to memo and returned as an array with suit and value being its elements.

function drawRandomCard() {
  var suit = suits[Math.floor(Math.random() * suits.length)];
  var number = deck[suit][Math.floor(Math.random() * 13)];
  if (memo[suit + number]) drawRandomCard();
  memo.push(suit + number)
  return [suit, number];
}

For instance:

var card1 = drawRandomCard();
var card2 = drawRandomCard();

You can then compare the values of these cards:

console.log(card1[1] > card2[1]); // true or false

If needed, you can match these values with relevant images using join to merge the card array elements together.

var img = new Image();
img.src = card1.join('') + '.jpg'; // e.g., diamond4.jpg

Or update the image source directly:

document.getElementById("card").src = card1.join('') + '.jpg';

Try it out yourself!

Answer 2

In my opinion, the issue lies not in your understanding of arrays and looping, but in how you structure your question before diving in. Currently, you have an array setup as follows:

var cardArray = ["Club0.jpg","Club1.jpg","Club3.jpg"...];

This approach may be complicating things unnecessarily for you, especially if you plan on performing numerical comparisons on these array elements. Instead, consider framing your problem statement more clearly like this:

"I am dealing with 4 suits of cards, each containing values from 1 to 13 (with Jack as 11, Queen as 12, King as 13, and Aces treated as low)."

To better tackle this scope, let's begin by creating a deck comprising four suits with 14 cards each.

var deck = {
  heart: [1,2,3,4,5,6,7,8,9,10,11,12,13],
  club: [1,2,3,4,5,6,7,8,9,10,11,12,13],
  spade: [1,2,3,4,5,6,7,8,9,10,11,12,13],
  diamond: [1,2,3,4,5,6,7,8,9,10,11,12,13]
};

We will also need an array to store the suit names for easy access to the object.

var suits = ['heart','club','spade','diamond'];

Next, we introduce memo, which is crucial for avoiding duplicates when drawing cards. It serves as a record of selected cards that we can refer back to.

var memo = [];

The key function here is drawRandomCard. It randomly selects a suit from our array of suits and a number from the corresponding suit's array. If the chosen card is found in memo, a new card is drawn; otherwise, it is added to memo and returned as an array with suit and value being its elements.

function drawRandomCard() {
  var suit = suits[Math.floor(Math.random() * suits.length)];
  var number = deck[suit][Math.floor(Math.random() * 13)];
  if (memo[suit + number]) drawRandomCard();
  memo.push(suit + number)
  return [suit, number];
}

For instance:

var card1 = drawRandomCard();
var card2 = drawRandomCard();

You can then compare the values of these cards:

console.log(card1[1] > card2[1]); // true or false

If needed, you can match these values with relevant images using join to merge the card array elements together.

var img = new Image();
img.src = card1.join('') + '.jpg'; // e.g., diamond4.jpg

Or update the image source directly:

document.getElementById("card").src = card1.join('') + '.jpg';

Try it out yourself!

Answer 3

Answer №2

To create a card game with JavaScript, you can start by defining a Card object that has properties like suit and number. Here is an example implementation:

function Card(suit, number) {
    this.suit = suit;
    this.number = number;
}
Card.prototype.image = function() {
    return this.suit + this.number + '.jpg';
};
Card.compare = function(a, b) {
    /* Define how you want to compare cards. For example, based on the numbers */
    return a.number < b.number;
};
Card.prototype.compareTo = function(other) {
    return Card.compare(this, other);
};

var suits = ['Club', 'Diamond', 'Heart', 'Spade'],
    cardArray = [];
for (var i = 0; i < suits.length; ++i) {
    for (var j = 0; j <= 12; ++j) cardArray.push(new Card(suits[i], j));
}
var currentCard = cardArray[0]; /* Setting initial card */

function randomCard() {
    var pickCard = cardArray[Math.random() * cardArray.length | 0];
    if(currentCard.compareTo(pickCard)) {
        /* Implement logic when the picked card matches the current card */
    } else {
        /* Implement logic when the picked card doesn't match the current card */
    }
    document.getElementById("card").src = pickCard.image();
    currentCard = pickCard;
}

If you need to ensure that a card is only picked once, modify the picking mechanism as follows:

var pickCard = cardArray.splice(Math.random() * cardArray.length | 0, 1)[0];

This code snippet removes the picked card from the array so that it cannot be selected again.

Answer 4

To create a card game with JavaScript, you can start by defining a Card object that has properties like suit and number. Here is an example implementation:

function Card(suit, number) {
    this.suit = suit;
    this.number = number;
}
Card.prototype.image = function() {
    return this.suit + this.number + '.jpg';
};
Card.compare = function(a, b) {
    /* Define how you want to compare cards. For example, based on the numbers */
    return a.number < b.number;
};
Card.prototype.compareTo = function(other) {
    return Card.compare(this, other);
};

var suits = ['Club', 'Diamond', 'Heart', 'Spade'],
    cardArray = [];
for (var i = 0; i < suits.length; ++i) {
    for (var j = 0; j <= 12; ++j) cardArray.push(new Card(suits[i], j));
}
var currentCard = cardArray[0]; /* Setting initial card */

function randomCard() {
    var pickCard = cardArray[Math.random() * cardArray.length | 0];
    if(currentCard.compareTo(pickCard)) {
        /* Implement logic when the picked card matches the current card */
    } else {
        /* Implement logic when the picked card doesn't match the current card */
    }
    document.getElementById("card").src = pickCard.image();
    currentCard = pickCard;
}

If you need to ensure that a card is only picked once, modify the picking mechanism as follows:

var pickCard = cardArray.splice(Math.random() * cardArray.length | 0, 1)[0];

This code snippet removes the picked card from the array so that it cannot be selected again.

Answer 5

Answer №3

If the card's image is Club10.jpg, you can extract the value using the following code:

card.match(/\d+/g)

This code will output:

Here is an example of how this code can be used:

var cardArray = ["Club0.jpg","Club1.jpg","Club3.jpg",...,"Spade12.jpg"];

var pickCard1 = cardArray[Math.floor(Math.random() * cardArray.length)];
var pickCard2 = cardArray[Math.floor(Math.random() * cardArray.length)];
if(parseInt(pickCard1.match(/\d+/g)) === parseInt(pickCard2.match(/\d+/g))){
    /*Do something here if the first equals the second card*/
} else if(parseInt(pickCard1.match(/\d+/g)) > parseInt(pickCard2.match(/\d+/g))){
    /*Do something here if the first card is greater than the second card*/
}else{
    /*Do something here if the first card is less than the second card*/
}

Answer 6

If the card's image is Club10.jpg, you can extract the value using the following code:

card.match(/\d+/g)

This code will output:

Here is an example of how this code can be used:

var cardArray = ["Club0.jpg","Club1.jpg","Club3.jpg",...,"Spade12.jpg"];

var pickCard1 = cardArray[Math.floor(Math.random() * cardArray.length)];
var pickCard2 = cardArray[Math.floor(Math.random() * cardArray.length)];
if(parseInt(pickCard1.match(/\d+/g)) === parseInt(pickCard2.match(/\d+/g))){
    /*Do something here if the first equals the second card*/
} else if(parseInt(pickCard1.match(/\d+/g)) > parseInt(pickCard2.match(/\d+/g))){
    /*Do something here if the first card is greater than the second card*/
}else{
    /*Do something here if the first card is less than the second card*/
}

Comparing Items within an Array in Javascript

Answer №1

Answer №2

Answer №3

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