Explica este código JavaScript
console.log(undefined || "0" || null || (undefined ?? 0))
A. 0
B. "0"
C. undefined
D. null
Respuesta en el primer comentario.
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Top comments (1)
Respuesta:
B.
"0"El operador de corto circuito OR (
||) solo se ejecuta si el primer operando es falsy.El nullish coalescing operator (
??) solo se ejecuta si el primer operando es nullish (nulloundefined).Vamos paso por paso:
undefined || "0":undefinedevalua como falsy entonces tendriamos"0".Nos quedaria el siguiente código:
"0" || null:"0"no evalua como falsy entonces no se ejecuta el operador de corto circuito.Nos quedaria el siguiente código:
undefined ?? 0: Operando tenemos como resultado0por queundefinedes un valor nullish.Nos quedaria el siguiente código:
Finalmente
"0"como cadena no es un valor falsy entonces no podemos ejecutar el operador de corto circuito dando como resultado final"0".