在Javascript4維陣列中查找重復項

對不起，我錯誤地描述了我的問題：

如果在這樣的呼叫中引數值為“macOS” -> countDuplicate(operatingSystem, "macOS");

該函式必須回傳 9 的數字。其他值（Windows、Unix...）也是如此。

謝謝 ！

let operatingSystem = [
  ["macOS", "Windows", "Unix"],
  ["macOS", ["Windows", "Unix", "macOS"], "Unix"],
  [["macOS", "Windows", "Unix"], "Windows", "Unix"],
  ["Unix", "macOS", ["Windows", "Unix", "macOS"]],
  [["macOS", "Windows", ["Unix", "Windows", "macOS"]], "Windows", "Unix"],
  [["Linux", "Android", ["Unix", "Windows", "macOS"]], "Windows", "Unix"],
];

function countDuplicate(array, arg) {
  let count = 0;

  for (let i = 0; i < operatingSystem.length; i  ) {
    for (let j = 0; j < operatingSystem[i].length; j  ) {
      for (let k = 0; k < operatingSystem[i][j].length; k  ) {
        for (let l = 0; l < operatingSystem[i][j][k].length; l  ) {
          let str = operatingSystem[i][j][k][l];
          if (str.indexOf(arg) > -1) {
            count  = 1;
            break;
          }
        }
      }
    }
  }
  console.log("There is "   count   " of "   arg   " similar items in this array.");
}
countDuplicate(operatingSystem, "macOS");

uj5u.com熱心網友回復：

首先你flat()多維陣列，然后使用這個解決方案：https : //stackoverflow.com/a/19395302/8205497

let operatingSystem = [
  ["macOS", "Windows", "Unix"],
  ["macOS", ["Windows", "Unix", "macOS"], "Unix"],
  [["macOS", "Windows", "Unix"], "Windows", "Unix"],
  ["Unix", "macOS", ["Windows", "Unix", "macOS"]],
  [["macOS", "Windows", ["Unix", "Windows", "macOS"]], "Windows", "Unix"],
  [["Linux", "Android", ["Unix", "Windows", "macOS"]], "Windows", "Unix"]
];

let counts = {};

operatingSystem.flat(4).forEach(function (x) { counts[x] = (counts[x] || 0)   1; });

console.log(counts);

let sum = 0;
Object.values(counts).forEach(x => sum  = x)

console.log(`The total sum is: ${sum}`)

uj5u.com熱心網友回復：

您可以使用遞回來計算所有元素。你也可以做一個平面陣列。

在遞回中，如果元素是陣列迭代并呼叫其他每個值添加到映射。

let operatingSystem = [
  ["macOS", "Windows", "Unix"],
  ["macOS", ["Windows", "Unix", "macOS"], "Unix"],
  [["macOS", "Windows", "Unix"], "Windows", "Unix"],
  ["Unix", "macOS", ["Windows", "Unix", "macOS"]],
  [["macOS", "Windows", ["Unix", "Windows", "macOS"]], "Windows", "Unix"],
  [["Linux", "Android", ["Unix", "Windows", "macOS"]], "Windows", "Unix"],
];

function countDuplicate(array, res = {}) {
  if (typeof array === "object") {
    array.forEach((x) => countDuplicate(x, res));
  } else {
    if (!res[array]) res[array] = 0;
    res[array]  ;
  }
}
let res = {};
countDuplicate(operatingSystem, res);

console.log(res);

console.log(Object.entries(res));

uj5u.com熱心網友回復：

您可以使用遞回和 aSet來檢查陣列中的每個專案并查看它是否唯一。如果它是一個陣列，則使用遞回，否則，如果它不是唯一的，則添加到計數中。

function countDuplicate(array, arg) {
  let count = 0;
  const uniqueItems = new Set()

  const checkArray = arr => {
      for (let item of arr) {
          if (Array.isArray(item)) {
              checkArray(item)
          } else if (uniqueItems.has(item)) {
              count  
          } else {
              uniqueItems.add(item)
          }
      }
  }
  
  checkArray(array)

  console.log("There is "   count   " similar items in this array.");
}

let operatingSystem = [
  ["macOS", "Windows", "Unix"],
  ["macOS", ["Windows", "Unix", "macOS"], "Unix"],
  [["macOS", "Windows", "Unix"], "Windows", "Unix"],
  ["Unix", "macOS", ["Windows", "Unix", "macOS"]],
  [["macOS", "Windows", ["Unix", "Windows", "macOS"]], "Windows", "Unix"],
  [["Linux", "Android", ["Unix", "Windows", "macOS"]], "Windows", "Unix"]
];

countDuplicate(operatingSystem)

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