What is the difference between apply and also. From what I know the following code does the same thing:
apply
val person = Person().apply {
name = "Tony Stark"
age = 52
// More such stuff
}
also
val person = Person().also {
it.name = "Tony Stark"
it.age = 52
// More such stuff
}
有什么区别吗？我应该使用其中一个吗？还有，在某些情况下，一个有效，另一个无效吗？
TL;DR Difference个
而且函数采用一个lambda，在该lambda中，使用it(隐式名称)或自定义名称引用调用函数的对象(接收器T).
val person = Person().而且 {
it.name = "Tony Stark"
}
With 申请, on the other hand, a function literal with receiver is used so inside the passed in lambda you can access the receiver’s members directly, as you see in the following. The receiver can be referenced by this.
val person = Person().申请 {
name = "Tony Stark"
}
声明:
inline fun <T> T.而且(block: (T) -> Unit): T (source)
调用指定的功能块with 100 (the receiver) value as its argument并返回this(接收器)值.
声明:
inline fun <T> T.申请(block: T.() -> Unit): T (source)
调用指定的函数挡路with 100 value as its receiver并返回this值(接收方).
使用示例在本thread节中进行了说明.