2.7 KiB
2.7 KiB
| id | title | isRequired | challengeType | videoUrl | localeTitle |
|---|---|---|---|---|---|
| afcc8d540bea9ea2669306b6 | Repeat a String Repeat a String | true | 5 | 重复一个字符串重复字符串 |
Description
num times（第二个参数）重复给定的字符串str （第一个参数）。如果num不是正数，则返回空字符串。如果卡住，请记得使用Read-Search-Ask 。编写自己的代码。 Instructions
Tests
tests:
- text: '<code>repeatStringNumTimes("*", 3)</code>应该返回<code>"***"</code> 。'
testString: 'assert(repeatStringNumTimes("*", 3) === "***", "<code>repeatStringNumTimes("*", 3)</code> should return <code>"***"</code>.");'
- text: '<code>repeatStringNumTimes("abc", 3)</code>应该返回<code>"abcabcabc"</code> 。'
testString: 'assert(repeatStringNumTimes("abc", 3) === "abcabcabc", "<code>repeatStringNumTimes("abc", 3)</code> should return <code>"abcabcabc"</code>.");'
- text: '<code>repeatStringNumTimes("abc", 4)</code>应返回<code>"abcabcabcabc"</code> 。'
testString: 'assert(repeatStringNumTimes("abc", 4) === "abcabcabcabc", "<code>repeatStringNumTimes("abc", 4)</code> should return <code>"abcabcabcabc"</code>.");'
- text: '<code>repeatStringNumTimes("abc", 1)</code>应该返回<code>"abc"</code> 。'
testString: 'assert(repeatStringNumTimes("abc", 1) === "abc", "<code>repeatStringNumTimes("abc", 1)</code> should return <code>"abc"</code>.");'
- text: '<code>repeatStringNumTimes("*", 8)</code>应该返回<code>"********"</code> 。'
testString: 'assert(repeatStringNumTimes("*", 8) === "********", "<code>repeatStringNumTimes("*", 8)</code> should return <code>"********"</code>.");'
- text: '<code>repeatStringNumTimes("abc", -2)</code>应返回<code>""</code> 。'
testString: 'assert(repeatStringNumTimes("abc", -2) === "", "<code>repeatStringNumTimes("abc", -2)</code> should return <code>""</code>.");'
- text: 不应使用内置的<code>repeat()</code>方法
testString: 'assert(!/\.repeat/g.test(code), "The built-in <code>repeat()</code>-method should not be used");'
Challenge Seed
function repeatStringNumTimes(str, num) {
// repeat after me
return str;
}
repeatStringNumTimes("abc", 3);
Solution
// solution required