Kotlin apply,also and let

@Test
    fun applyAndAlso() {
        Car().apply { id = 10; name = "dd" }.let { println(it) }
        Car().also { it.id = 10; it.name = "dd" }.let { println(it) }
 
data class Car(var id: Int? = null, var name: String? = null)

this result is :

Car(id=10, name=dd)
Car(id=10, name=dd)

@Test
fun letAndAlso() {
    "car1".apply { reversed()}.let { println(it) }
    "car1".also { it.reversed()}.let { println(it) }
    "car1".let { it.reversed()}.let { println(it) }

}

this result is :

car1
car1
1rac

my understand : apply and also is same things but pass the param is different .

1 T.apply和T.also是一对，它们的返回值为this，他们的区别在于apply block参数中传递的是this，also block参数中传递的是it
2 T.run和T.let是一对，它们的返回值是block执行的结果，它们的区别在于run block参数传递的是this，let block参数传递的是it
3 run和with是一对，run block参数中既不是this也不是it。with block参数是this