Example
let in Kotlin creates a local binding from the object it was called upon.
Example:
val str = "foo"
str.let {
println(it) // it
}
This will print "foo" and will return Unit.
The difference between let and also is that you can return any value from a let block. also in the other hand will always reutrn Unit.
Now why this is useful, you ask? Because if you call a method which can return null and you want to run some code only when that return value is not null you can use let or also like this:
val str: String? = someFun()
str?.let {
println(it)
}
This piece of code will only run the let block when str is not null. Note the null safety operator (?).
