August 2024
Intermediate to advanced
1014 pages
26h
Spanish
Content preview from Python fluido, 2ª edición
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Capítulo 16. Sobrecarga de operadores
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Hay algunas cosas sobre las que me siento un poco desgarrado, como la sobrecarga de operadores. Dejé fuera la sobrecarga de operadores como una opción bastante personal porque había visto a demasiada gente abusar de ella en C++.
James Gosling, creador de Java1
En Python, puedes calcular el interés compuesto mediante una fórmula escrita así:
interest=principal*((1+rate)**periods-1)
Los operadores que aparecen entre operandos, como 1 + rate, son operadores infijos. En Python, los operadores infijos pueden manejar cualquier tipo arbitrario. Así, si estás tratando con dinero real, puedes asegurarte de que principal, rate, y periods son números exactos -instancias de la clase decimal.Decimal de Python- y que la fórmula funcionará como está escrita, produciendo un resultado exacto.
Pero en Java, si pasas de float a BigDecimal para obtener resultados exactos, ya no puedes utilizar operadores infijos, porque sólo funcionan con los tipos primitivos. Ésta es la misma fórmula codificada para funcionar con números BigDecimal en Java:
BigDecimalinterest=principal.multiply(BigDecimal.ONE.add(rate).pow(periods).subtract(BigDecimal.ONE));
Está claro que los operadores infijos hacen que las fórmulas sean más legibles. La sobrecarga de operadores es necesaria para soportar la notación de operadores infijos con tipos definidos ...
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