kotlin - Kotlin 将字符串映射到另一种类型？

Question

很快，我可以做到

"Some String".map { SomeObject($0) } 

在 kotlin 中，字符串似乎被视为 char 数组，因此结果是每个字符的映射。是否有可能获得类似我发布的快速代码的行为？

"Some String".map { SomeObject(it) } 

标签： kotlin

Answer 1

You can accomplish something like that with let:

"Some String".let { SomeObject(it) }

If you have an appropriate constructor in place (e.g. constructor(s : String) : this(...)) you can also call it as follows:

"Some String".let(::SomeObject)

run and with work also, but are usually taken if you want to rather call a method of the receiver on it. Using run/with for this would look as follows:

"Some String".run { SomeObject(this) }
with ("Some String") { SomeObject(this) }

// but run / with is rather useful for things like the following (where the shown function calls are functions of SomeObject):
val x = someObject.run {
  doSomethingBefore()
  returningSomethingElse()
}