How to count elements from list if specific key present in list using scala? -

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मेरे पास सूची संरचना का पालन है - 

  "disks": [{"name": "ए", "सदस्य नहीं": 1}, {"नाम": "बी", "सदस्य नहीं": 2}, {"नाम": "सी", "सदस्य नहीं": 3}, {"नाम": "डी ",}]

मेरे पास सूची में कई तत्व हैं और 'सदस्य नहीं' के लिए जांचना चाहते हैं, यदि यह मौजूद है, तो मुझे सूची तत्वों में से गिनना चाहिए।

उदा।

आइटमप्रॉप = "पाठ">

पहले अपने इनपुट डेटा का प्रतिनिधित्व करने के लिए क्लास बनाएं 

  केस वर्ग डिस्क (नाम: स्ट्रिंग, सदस्य: स्ट्रिंग) रिपॉजिटरी (या अन्य डेटा स्रोत) से अगला लोड डेटा  
  val डिस्क: सूची [डिस्क] = ...  
 
 और अंत में गिनती 
 < Pre>  disks.count (d = & gt; विकल्प (d.memberNo) .isDefined)

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