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XCEngine/docs/api/containers/string/starts-with.md
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# String::StartsWith
```cpp
bool StartsWith(const String& prefix) const;
bool StartsWith(const char* prefix) const;
```
检查字符串是否以指定的前缀开头。
**参数:**
- `prefix` - 要检查的前缀String 或 const char*
**返回:** 如果字符串以指定前缀开头则返回 `true`,否则返回 `false`
**复杂度:** O(n),其中 n 为前缀长度
**示例:**
```cpp
#include "XCEngine/Core/Containers/String.h"
#include <iostream>
int main() {
XCEngine::Containers::String s("Hello World");
std::cout << std::boolalpha;
std::cout << s.StartsWith("Hello") << std::endl; // 输出: true
std::cout << s.StartsWith(XCEngine::Containers::String("Hello")) << std::endl; // 输出: true
std::cout << s.StartsWith("World") << std::endl; // 输出: false
std::cout << s.StartsWith("") << std::endl; // 输出: true
return 0;
}
```
## 相关文档
- [String 总览](string.md) - 返回类总览
- [EndsWith](ends-with.md) - 检查后缀
- [Find](find.md) - 查找子串