循环后函数在对象中返回未定义的值

Question

I'm currently working on my first JS project, a BlackJack game. I've written a function to create a deck, deck is an array of objects containing card's Suit, Value and Weight. As for the Weight, after looping the function returns undefined, Suit and Value are returned fine. Here is my code:

// Creation of the deck
function deckCreate() {
  for (let i = 0; i < cardSuits.length; i++) {
    for (let j = 0; j < cardValues.length; j++) {
      let cardWeight = parseInt(cardValues[j]);
      if (cardValues[j] === "J" || cardValues[j] === "Q" || cardValues[j] === "K") {
        cardWeight = 10;
      } if (cardValues[j] === "A") {
        cardWeight = 11;
      }
      let card = {
        Suit: cardSuits[i],
        Value: cardValues[j],
        Weight: cardWeight[j]
      }; deck.push(card);
    }
  } return deck;
}

Beforehand I have the following variables created:

const cardSuits = ["♣", "♥", "♦", "♠"];
const cardValues = ["2", "3", "4", "5", "6", "7", "8", "9", "10", "J", "Q", "K", "A"];
let deck = [];

The objects that are returned are: eg

0: {Suit: "♠", Value: "2", Weight: undefined}
1: {Suit: "♥", Value: "10", Weight: undefined}
2: {Suit: "♣", Value: "5", Weight: undefined}

And I can't seem to understand why the Weight is undefined. Would appreciate any help Thanks!

Answer 1

Corrected, removing [j]

 // Creation of the deck function deckCreate() { for (let i = 0; i < cardSuits.length; i++) { for (let j = 0; j < cardValues.length; j++) { let cardWeight = parseInt(cardValues[j]); if (cardValues[j] === "J" || cardValues[j] === "Q" || cardValues[j] === "K") { cardWeight = 10; } if (cardValues[j] === "A") { cardWeight = 11; } let card = { Suit: cardSuits[i], Value: cardValues[j], Weight: cardWeight }; deck.push(card); } } return deck; } const cardSuits = ["&clubs;", "&hearts;", "&diams;", "&spades;"]; const cardValues = ["2", "3", "4", "5", "6", "7", "8", "9", "10", "J", "Q", "K", "A"]; var deck = []; console.log(deckCreate()); 

Answer 2

The cardWeight is a number and not an array, which you get from this line:

// You are pulling a single value from an array here:
let cardWeight = parseInt(cardValues[j]);

so when you try to pass an index to it, you get undefined returned. Just access cardWeight as a single value:

 // Creation of the deck let cardSuits = ["&Clubs", "&Spades", "&Diamonds", "&Hearts"]; let cardValues = [2,3,4,5,6,7,8,9,10,"J","Q","K","A"]; let deck = []; function deckCreate() { for (let i = 0; i < cardSuits.length; i++) { for (let j = 0; j < cardValues.length; j++) { let cardWeight = parseInt(cardValues[j]); if (cardValues[j] === "J" || cardValues[j] === "Q" || cardValues[j] === "K") { cardWeight = 10; } if (cardValues[j] === "A") { cardWeight = 11; } let card = { Suit: cardSuits[i], Value: cardValues[j], Weight: cardWeight // <-- This is a single value, not an array }; deck.push(card); } } return deck; } console.log(deckCreate()); 

Answer 3

将权Weight: cardWeight[j]更改为权Weight: cardWeight