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Überprüfen Sie, ob eine Variable undefiniert oder null ist. JavaScript

Überprüfen Sie, ob eine Variable undefiniert oder null ist. 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

Codebeispiele und Antworten auf Fragen in der Sprache der JavaScript-Programmierung

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