একটি ভেরিয়েবল অনির্ধারিত বা শূন্য কিনা তা পরীক্ষা করুন. JavaScript

একটি ভেরিয়েবল অনির্ধারিত বা শূন্য কিনা তা পরীক্ষা করুন. JavaScript



undefined, null
JavaScript example code

JavaScript

  Output result
The variable is neither undefined nor null
The variable is neither undefined nor null
The variable is undefined or null
The variable is undefined or null
typeof
JavaScript example code

JavaScript

  Output result
The variable is neither undefined nor null
The variable is neither undefined nor null
The variable is undefined or null
The variable is undefined or null

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