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Comprobar si una variable no está definida o es nula. JavaScript

Comprobar si una variable no está definida o es nula. 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

ejemplos de código y respuesta a preguntas en lenguaje de programación JavaScript

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