Bir Değişkenin tanımsız veya boş olup olmadığını kontrol edin. JavaScript

Bir Değişkenin tanımsız veya boş olup olmadığını kontrol edin. 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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