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Vérifier si une variable est indéfinie ou nulle. JavaScript

Vérifier si une variable est indéfinie ou nulle. JavaScript

#JavaScript #null #typeof #undefined 


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
code examples and answer to questions in JavaScript programming luaguage

JavaScript

exemples de code et réponses aux questions du langage de programmation JavaScript

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