---
id: 56533eb9ac21ba0edf2244ab
title: Understanding Case Sensitivity in Variables
challengeType: 1
videoUrl: ''
localeTitle: 了解变量中的大小写敏感度
---
## Description
在JavaScript中，所有变量和函数名称都区分大小写。这意味着资本化很重要。 MYVAR与MyVar和myvar 。可以有多个具有相同名称但不同外壳的不同变量。强烈建议您为清晰起见， 不要使用此语言功能。 最佳实践
在camelCase中用 JavaScript编写变量名。在camelCase中 ，多字变量名称的第一个单词为小写，每个后续单词的首字母大写。 例子： var someVariable;
var anotherVariableName;
var thisVariableNameIsSoLong;
## Instructions
修改现有的声明和赋值，使其名称使用camelCase 。
不要创建任何新变量。
## Tests
```yml
tests:
- text: studlyCapVar已定义且值为10
testString: 'assert(typeof studlyCapVar !== "undefined" && studlyCapVar === 10, "studlyCapVar is defined and has a value of 10");'
- text: properCamelCase已定义且值为"A String"
testString: 'assert(typeof properCamelCase !== "undefined" && properCamelCase === "A String", "properCamelCase is defined and has a value of "A String"");'
- text: titleCaseOver已定义，其值为9000
testString: 'assert(typeof titleCaseOver !== "undefined" && titleCaseOver === 9000, "titleCaseOver is defined and has a value of 9000");'
- text: studlyCapVar应该在声明和赋值部分使用camelCase。
testString: 'assert(code.match(/studlyCapVar/g).length === 2, "studlyCapVar should use camelCase in both declaration and assignment sections.");'
- text: properCamelCase应该在声明和赋值部分使用camelCase。
testString: 'assert(code.match(/properCamelCase/g).length === 2, "properCamelCase should use camelCase in both declaration and assignment sections.");'
- text: titleCaseOver应该在声明和赋值部分使用camelCase。
testString: 'assert(code.match(/titleCaseOver/g).length === 2, "titleCaseOver should use camelCase in both declaration and assignment sections.");'
```
## Challenge Seed
```js
// Declarations
var StUdLyCapVaR;
var properCamelCase;
var TitleCaseOver;
// Assignments
STUDLYCAPVAR = 10;
PRoperCAmelCAse = "A String";
tITLEcASEoVER = 9000;
```
## Solution
```js
// solution required
```