Run

Not related to threads in any way, run() is much like let(), but it sets the context to this instead of using it:

val justAString = "string"

val n = justAString.run { 
this.length
}

Usually, this could be omitted:

val n = justAString.run { 
length
}

It is mostly useful when you plan to call a number of methods on the same object, much like apply().

The return result, unlike apply(), may be of a totally different type, though:

val year = JamesBond().run {
name = "ROGER MOORE"
movie = "THE MAN WITH THE GOLDEN GUN"
1974 // <= Not JamesBond type
}