---
id: 56533eb9ac21ba0edf2244d6
title: Comparison with the Less Than Operator
challengeType: 1
videoUrl: ''
localeTitle: 与小于算子的比较
---
## Description
小于运算符（ < ）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true 。否则，它返回false 。与等于运算符一样， 少于运算符在比较时转换数据类型。 例子 2 <5 //是的
'3'<7 //是的
5 <5 //假
3 <2 //假
'8'<4 //假
## Instructions
将less than运算符添加到指示的行，以便返回语句有意义。
## Tests
```yml
tests:
- text: testLessThan(0)应该返回“25岁以下”
testString: 'assert(testLessThan(0) === "Under 25", "testLessThan(0) should return "Under 25"");'
- text: testLessThan(24)应该返回“25岁以下”
testString: 'assert(testLessThan(24) === "Under 25", "testLessThan(24) should return "Under 25"");'
- text: testLessThan(25)应该返回“55岁以下”
testString: 'assert(testLessThan(25) === "Under 55", "testLessThan(25) should return "Under 55"");'
- text: testLessThan(54)应该返回“55岁以下”
testString: 'assert(testLessThan(54) === "Under 55", "testLessThan(54) should return "Under 55"");'
- text: testLessThan(55)应返回“55或以上”
testString: 'assert(testLessThan(55) === "55 or Over", "testLessThan(55) should return "55 or Over"");'
- text: testLessThan(99)应返回“55或以上”
testString: 'assert(testLessThan(99) === "55 or Over", "testLessThan(99) should return "55 or Over"");'
- text: 您应该至少使用<运算符两次
testString: 'assert(code.match(/val\s*<\s*("|")*\d+("|")*/g).length > 1, "You should use the < operator at least twice");'
```
## Challenge 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);
```
## Solution
```js
// solution required
```