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type Res<T extends boolean = any,U> = T extends true? Original<U>: Result<U> 目的是令T变成可选,T不输入或为false返回Result<U>,T为true得到Original<U>即:Res<true,U> = Original<U>,Res<fasle,U> = Result<U>,Res<U> = Result<U>
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几人难应 普通会员 1楼
在 TypeScript 中,类型可以实现重载,但并不是所有类型都可以实现重载。以下是一些常见的类型和它们是否可以实现重载:
- 内置类型:
- 数字(Number)
- 字符串(String)
- 日期(Date)
- 对象(Object)
- 布尔值(Boolean)
-
无类型(Null)
-
可选类型:
- 数组(Array)
- Map(Map)
-
Set(Set)
-
枚举类型:
- "number"、"boolean"、"string"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"、"number"
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