具有鍵號和重復字符串值的 JSON 對象分隔為帶有計數的字符串數組

Question

我有一個下面提到的格式的 json 對象。 我需要一個函數來返回課程名稱和計數。 從這個問題可以回答我的問題。 這個答案是針對不同的 json 對象的。 [“高級數據結構”，3]，[“高級-r”，3]

// Size of the JSON Object
  let json = {
    "0": "advanced-data-structures",
    "1": "advanced-data-structures",
    "145": "advanced-data-structures",
    "149": "advanced-excel",
    "185": "advanced-excel",
    "186": "advanced-r",
    "202": "advanced-r",
    "203": "advanced-r",
    "204": "advanced-trading-algorithms",
    "205": "advanced-trading-algorithms",
    "206": "agile-planning-for-software-products",
    "276": "agile-planning-for-software-products",
    "277": "agile-planning-for-software-products",
    "278": "algorithmic-thinking-1",
    "282": "algorithmic-thinking-1",
    "283": "algorithmic-thinking-1"
  };
  let arrayOfCourses = [];
  let count = Object.keys(json).length;
  Object.keys(json).forEach(function(prop) {
    console.log('Key Count', prop)
  });
  Object.values(json).forEach(function (prop){
    console.log('Value', prop);
    // I would need something like this
    // ["advanced-data-structures", 3],
    // ["advanced-r", 3]
  });

  for(var i = 0 ; i< count; i++) {
    console.log(json[i])
    arrayOfCourses.push(json[i]);
  }
  let uniqueItems = Array.from(new Set(arrayOfCourses))
  // unique Items removing duplicates. 
  console.log(uniqueItems)

Answer 1

您可以先獲取對象的 Object.values，然后根據課程名稱將其減少：

 const json = { "0": "advanced-data-structures", "1": "advanced-data-structures", "145": "advanced-data-structures", "149": "advanced-excel", "185": "advanced-excel", "186": "advanced-r", "202": "advanced-r", "203": "advanced-r", "204": "advanced-trading-algorithms", "205": "advanced-trading-algorithms", "206": "agile-planning-for-software-products", "276": "agile-planning-for-software-products", "277": "agile-planning-for-software-products", "278": "algorithmic-thinking-1", "282": "algorithmic-thinking-1", "283": "algorithmic-thinking-1" }; const result = Object.entries(Object.values(json).reduce((a,e)=>{ a[e] = a[e] || 0; a[e]+=1; return a; },{})); console.log(result);

在 reduce 之后，您可以獲取該結果對象的entries 。