javascript inicializar una variable
var a = 1;
b = 4;
delete this.a; // Lanza un error de tipo "ReferenceError" en modo estricto ('use strict'), de lo contrario falla silenciosamente.
delete this.b;
console.log(a, b); // Lanza un error de tipo "ReferenceError".
// La propiedad 'b' se eliminó y ya no existe.
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