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# Functions and methods

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## 1. std::String

### 1.1 Create a String  from a string  literal(字符串字面值)

* String::from()
* str.to\_string()
* let variable: String = str.into()

### 1.2 从utf-8 btyes创建String

* `String::from_utf8(bytes).unwarp()`
* `string.into_bytes()`,将一个String转化为bytes

### 1.3 向一个可变String添加字符

* `push_str(str)`