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Merge pull request mouredev#4221 from Cesar-Ch/add-cesar-solutions
Reto mouredev#28 - Javascript
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Retos/Reto #28 - EXPRESIÓN MATEMÁTICA [Media]/javascript/cesar-ch.js
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/* | ||
* Crea una función que reciba una expresión matemática (String) | ||
* y compruebe si es correcta. Retornará true o false. | ||
* - Para que una expresión matemática sea correcta debe poseer | ||
* un número, una operación y otro número separados por espacios. | ||
* Tantos números y operaciones como queramos. | ||
* - Números positivos, negativos, enteros o decimales. | ||
* - Operaciones soportadas: + - * / % | ||
* | ||
* Ejemplos: | ||
* "5 + 6 / 7 - 4" -> true | ||
* "5 a 6" -> false | ||
*/ | ||
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function isMathExpression(str) { | ||
const operations = ['+', '-', '*', '/', '%'] | ||
const mathExpression = str.split(' ') | ||
if (mathExpression.length < 3 || mathExpression.length % 2 == 0) { | ||
return false | ||
} | ||
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let isMathExpression = true | ||
mathExpression.map((e, i) => { | ||
if (!Number(e) && i % 2 == 0) { | ||
isMathExpression = false | ||
} | ||
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if (!operations.includes(e) && i % 2 != 0) { | ||
isMathExpression = false | ||
} | ||
} | ||
) | ||
return isMathExpression | ||
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} | ||
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console.log(isMathExpression("3 + 5")) | ||
console.log(isMathExpression("3 a 5")) | ||
console.log(isMathExpression("-3 + 5")) | ||
console.log(isMathExpression("- 3 + 5")) | ||
console.log(isMathExpression("-3 a 5")) | ||
console.log(isMathExpression("-3+5")) | ||
console.log(isMathExpression("3 + 5 - 1 / 4 % 8")) |