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# Descripción | ||
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El Grinch está abriendo las cartas que iban a Santa Claus y las está dejando hechas un lío. 😱 | ||
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Las cartas son una cadena de texto que incluyen regalos y paréntesis (). | ||
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Para saber si una carta es válida ✅, debes comprobar que los paréntesis cierran correctamente y que, además, no vayan vacíos. | ||
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¡Pero ojo! Porque el Grinch ha dejado llaves { y corchetes [ dentro de los paréntesis que hacen que no sean válidas. Por suerte sólo los ha dejado en medio de los paréntesis... | ||
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Ejemplos: | ||
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```js | ||
'bici coche (balón) bici coche peluche'; // -> ✅ | ||
'(muñeca) consola bici'; // ✅ | ||
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'bici coche (balón bici coche'; // -> ❌ | ||
'peluche (bici [coche) bici coche balón'; // -> ❌ | ||
'(peluche {) bici'; // -> ❌ | ||
'() bici'; // ❌ | ||
``` | ||
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Crea una función que pasándole el texto de la carta, devuelva true si es válida y false si no lo es. ¡Y acaba con la travesura del Grinch! |
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export default function isValid(letter) { | ||
let parenthesisCounter = 0; | ||
let characterCounter = 0; | ||
let character; | ||
const length = letter.length; | ||
for (let i = 0; i < length; i++) { | ||
character = letter[i]; | ||
if (parenthesisCounter > 0 && character === ' ') { | ||
return false; | ||
} else if (character === ')') { | ||
parenthesisCounter -= 1; | ||
if (characterCounter === 0) return false; | ||
characterCounter = 0; | ||
} else if (character === '(') { | ||
parenthesisCounter += 1; | ||
} else if (parenthesisCounter > 0) { | ||
characterCounter += 1; | ||
} | ||
} | ||
return parenthesisCounter === 0; | ||
} |