119 lines
5.1 KiB
Markdown
119 lines
5.1 KiB
Markdown
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---
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title: Balanced brackets
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id: 594dc6c729e5700999302b45
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localeTitle: 594dc6c729e5700999302b45
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challengeType: 5
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---
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## Description
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<section id='description'>
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<p> Determine si una cadena generada de corchetes está equilibrada; es decir, si consiste completamente en pares de paréntesis de apertura / cierre (en ese orden), ninguno de los cuales se equivoca. </p>
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Ejemplos:
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<p class='rosetta__paragraph'> (vacío) verdadero </p>
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<p class='rosetta__paragraph'> <code>[]</code> verdadero </p>
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<p class='rosetta__paragraph'> <code>][</code> falso </p>
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<p class='rosetta__paragraph'> <code>[][]</code> verdadero </p>
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<p class='rosetta__paragraph'> <code>][][</code> falso </p>
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<p class='rosetta__paragraph'> <code>[]][[]</code> falso </p>
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<p class='rosetta__paragraph'> <code>[[[[]]]]</code> verdadero </p>
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</section>
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## Instructions
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<section id='instructions'>
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</section>
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## Tests
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<section id='tests'>
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```yml
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tests:
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- text: <code>isBalanced</code> es una función.
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testString: 'assert(typeof isBalanced === "function", "<code>isBalanced</code> is a function.");'
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- text: ' <code>isBalanced("[]")</code> debe devolver verdadero.'
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testString: 'assert(isBalanced(testCases[0]), "<code>isBalanced("[]")</code> should return true.");'
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- text: ' <code>isBalanced("]][[[][][][]][")</code> debe devolver falso.'
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testString: 'assert(!isBalanced(testCases[1]), "<code>isBalanced("]][[[][][][]][")</code> should return false.");'
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- text: ' <code>isBalanced("[][[[[][][[[]]]]]]")</code> debe devolver verdadero).
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testString: 'assert(isBalanced(testCases[2]), "<code>isBalanced("[][[[[][][[[]]]]]]")</code> should return true.");'
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- text: ' <code>isBalanced("][")</code> debe devolver verdadero.'
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testString: 'assert(!isBalanced(testCases[3]), "<code>isBalanced("][")</code> should return true.");'
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- text: ' <code>isBalanced("[[[]]]][[]")</code> debe devolver verdadero.'
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testString: 'assert(!isBalanced(testCases[4]), "<code>isBalanced("[[[]]]][[]")</code> should return true.");'
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- text: ' <code>isBalanced("][[]")</code> debe devolver verdadero.'
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testString: 'assert(!isBalanced(testCases[5]), "<code>isBalanced("][[]")</code> should return true.");'
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- text: ' <code>isBalanced("][[][]][[[]]")</code> debe devolver verdadero.'
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testString: 'assert(!isBalanced(testCases[6]), "<code>isBalanced("][[][]][[[]]")</code> should return true.");'
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- text: ' <code>isBalanced("[[][]]][")</code> debe devolver verdadero.'
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testString: 'assert(!isBalanced(testCases[7]), "<code>isBalanced("[[][]]][")</code> should return true.");'
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- text: ' <code>isBalanced("[[[]]][[]]]][][[")</code> debería devolver true.'
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testString: 'assert(!isBalanced(testCases[8]), "<code>isBalanced("[[[]]][[]]]][][[")</code> should return true.");'
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- text: ' <code>isBalanced("[]][[]]][[[[][]]")</code> debe devolver verdadero.'
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testString: 'assert(!isBalanced(testCases[9]), "<code>isBalanced("[]][[]]][[[[][]]")</code> should return true.");'
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- text: ' <code>isBalanced("][]][[][")</code> debe devolver verdadero.'
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testString: 'assert(!isBalanced(testCases[10]), "<code>isBalanced("][]][[][")</code> should return true.");'
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- text: ' <code>isBalanced("[[]][[][]]")</code> debe devolver verdadero.'
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testString: 'assert(isBalanced(testCases[11]), "<code>isBalanced("[[]][[][]]")</code> should return true.");'
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- text: ' <code>isBalanced("[[]]")</code> debe devolver verdadero.'
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testString: 'assert(isBalanced(testCases[12]), "<code>isBalanced("[[]]")</code> should return true.");'
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- text: ' <code>isBalanced("]][]][[]][[[")</code> debe devolver verdadero ".
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testString: 'assert(!isBalanced(testCases[13]), "<code>isBalanced("]][]][[]][[[")</code> should return true.");'
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- text: ' <code>isBalanced("][]][][[")</code> debería devolver verdadero.'
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testString: 'assert(!isBalanced(testCases[14]), "<code>isBalanced("][]][][[")</code> should return true.");'
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- text: ' <code>isBalanced("][][")</code> debe devolver verdadero.'
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testString: 'assert(!isBalanced(testCases[15]), "<code>isBalanced("][][")</code> should return true.");'
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- text: ' <code>isBalanced("[[]]][][][[]][")</code> debe devolver verdadero.'
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testString: 'assert(!isBalanced(testCases[16]), "<code>isBalanced("[[]]][][][[]][")</code> should return true.");'
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- text: <code>isBalanced("")</code> debe devolver true.
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testString: 'assert(isBalanced(testCases[17]), "<code>isBalanced("")</code> should return true.");'
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```
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</section>
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## Challenge Seed
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<section id='challengeSeed'>
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<div id='js-seed'>
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```js
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function isBalanced (str) {
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// Good luck!
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return true;
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}
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```
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</div>
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### After Test
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<div id='js-teardown'>
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```js
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console.info('after the test');
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```
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</div>
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</section>
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## Solution
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<section id='solution'>
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```js
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function isBalanced (str) {
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if (str === ") return true;
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let a = str;
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let b;
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do {
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b = a;
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a = a.replace(/\[\]/g, ");
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} while (a !== b);
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return !a;
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}
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```
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</section>
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