78 lines
2.7 KiB
Markdown
78 lines
2.7 KiB
Markdown
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---
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id: afcc8d540bea9ea2669306b6
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title: Repeat a String Repeat a String
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isRequired: true
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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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Repeat a given string <code>str</code> (first argument) for <code>num</code> times (second argument). Return an empty string if <code>num</code> is not a positive number.
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Remember to use <a href="http://forum.freecodecamp.org/t/how-to-get-help-when-you-are-stuck/19514" target="_blank">Read-Search-Ask</a> if you get stuck. Write your own code.
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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>repeatStringNumTimes("*", 3)</code> should return <code>"***"</code>.'
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testString: 'assert(repeatStringNumTimes("*", 3) === "***", ''<code>repeatStringNumTimes("*", 3)</code> should return <code>"***"</code>.'');'
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- text: '<code>repeatStringNumTimes("abc", 3)</code> should return <code>"abcabcabc"</code>.'
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testString: 'assert(repeatStringNumTimes("abc", 3) === "abcabcabc", ''<code>repeatStringNumTimes("abc", 3)</code> should return <code>"abcabcabc"</code>.'');'
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- text: '<code>repeatStringNumTimes("abc", 4)</code> should return <code>"abcabcabcabc"</code>.'
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testString: 'assert(repeatStringNumTimes("abc", 4) === "abcabcabcabc", ''<code>repeatStringNumTimes("abc", 4)</code> should return <code>"abcabcabcabc"</code>.'');'
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- text: '<code>repeatStringNumTimes("abc", 1)</code> should return <code>"abc"</code>.'
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testString: 'assert(repeatStringNumTimes("abc", 1) === "abc", ''<code>repeatStringNumTimes("abc", 1)</code> should return <code>"abc"</code>.'');'
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- text: '<code>repeatStringNumTimes("*", 8)</code> should return <code>"********"</code>.'
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testString: 'assert(repeatStringNumTimes("*", 8) === "********", ''<code>repeatStringNumTimes("*", 8)</code> should return <code>"********"</code>.'');'
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- text: '<code>repeatStringNumTimes("abc", -2)</code> should return <code>""</code>.'
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testString: 'assert(repeatStringNumTimes("abc", -2) === "", ''<code>repeatStringNumTimes("abc", -2)</code> should return <code>""</code>.'');'
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- text: The built-in <code>repeat()</code>-method should not be used
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testString: 'assert(!/\.repeat/g.test(code), ''The built-in <code>repeat()</code>-method should not be used'');'
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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 repeatStringNumTimes(str, num) {
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// repeat after me
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return str;
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}
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repeatStringNumTimes("abc", 3);
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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 repeatStringNumTimes(str, num) {
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if (num < 0) return '';
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return num === 1 ? str : str + repeatStringNumTimes(str, num-1);
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}
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repeatStringNumTimes("abc", 3);
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```
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</section>
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