75 lines
2.5 KiB
Markdown
75 lines
2.5 KiB
Markdown
|
---
|
||
|
|
id: 56533eb9ac21ba0edf2244d6
|
||
|
|
title: Comparison with the Less Than Operator
|
||
|
|
challengeType: 1
|
||
|
|
videoUrl: ''
|
||
|
|
localeTitle: 与小于算子的比较
|
||
|
|
---
|
||
|
|
|
||
|
|
## Description
|
||
|
|
<section id="description"> <dfn>小于</dfn>运算符（ <code><</code> ）比较两个数字的值。如果左边的数字小于右边的数字，则返回<code>true</code> 。否则，它返回<code>false</code> 。与等于运算符一样， <dfn>少于</dfn>运算符在比较时转换数据类型。 <strong>例子</strong> <blockquote> 2 <5 //是的<br> '3'<7 //是的<br> 5 <5 //假<br> 3 <2 //假<br> '8'<4 //假</blockquote></section>
|
||
|
|
|
||
|
|
## Instructions
|
||
|
|
<section id="instructions">将<code>less than</code>运算符添加到指示的行，以便返回语句有意义。 </section>
|
||
|
|
|
||
|
|
## Tests
|
||
|
|
<section id='tests'>
|
||
|
|
|
||
|
|
```yml
|
||
|
|
tests:
|
||
|
|
- text: <code>testLessThan(0)</code>应该返回“25岁以下”
|
||
|
|
testString: 'assert(testLessThan(0) === "Under 25", "<code>testLessThan(0)</code> should return "Under 25"");'
|
||
|
|
- text: <code>testLessThan(24)</code>应该返回“25岁以下”
|
||
|
|
testString: 'assert(testLessThan(24) === "Under 25", "<code>testLessThan(24)</code> should return "Under 25"");'
|
||
|
|
- text: <code>testLessThan(25)</code>应该返回“55岁以下”
|
||
|
|
testString: 'assert(testLessThan(25) === "Under 55", "<code>testLessThan(25)</code> should return "Under 55"");'
|
||
|
|
- text: <code>testLessThan(54)</code>应该返回“55岁以下”
|
||
|
|
testString: 'assert(testLessThan(54) === "Under 55", "<code>testLessThan(54)</code> should return "Under 55"");'
|
||
|
|
- text: <code>testLessThan(55)</code>应返回“55或以上”
|
||
|
|
testString: 'assert(testLessThan(55) === "55 or Over", "<code>testLessThan(55)</code> should return "55 or Over"");'
|
||
|
|
- text: <code>testLessThan(99)</code>应返回“55或以上”
|
||
|
|
testString: 'assert(testLessThan(99) === "55 or Over", "<code>testLessThan(99)</code> should return "55 or Over"");'
|
||
|
|
- text: 您应该至少使用<code><</code>运算符两次
|
||
|
|
testString: 'assert(code.match(/val\s*<\s*("|")*\d+("|")*/g).length > 1, "You should use the <code><</code> operator at least twice");'
|
||
|
|
|
||
|
|
```
|
||
|
|
|
||
|
|
</section>
|
||
|
|
|
||
|
|
## Challenge Seed
|
||
|
|
<section id='challengeSeed'>
|
||
|
|
|
||
|
|
<div id='js-seed'>
|
||
|
|
|
||
|
|
```js
|
||
|
|
function testLessThan(val) {
|
||
|
|
if (val) { // Change this line
|
||
|
|
return "Under 25";
|
||
|
|
}
|
||
|
|
|
||
|
|
if (val) { // Change this line
|
||
|
|
return "Under 55";
|
||
|
|
}
|
||
|
|
|
||
|
|
return "55 or Over";
|
||
|
|
}
|
||
|
|
|
||
|
|
// Change this value to test
|
||
|
|
testLessThan(10);
|
||
|
|
|
||
|
|
```
|
||
|
|
|
||
|
|
</div>
|
||
|
|
|
||
|
|
|
||
|
|
|
||
|
|
</section>
|
||
|
|
|
||
|
|
## Solution
|
||
|
|
<section id='solution'>
|
||
|
|
|
||
|
|
```js
|
||
|
|
// solution required
|
||
|
|
```
|
||
|
|
</section>
|