CODEWITHSUNDEEP
scopekotlin
user5507535
user5507535

Reputation: 1800

Does Kotlin has a scope delimiter?

In C one can use { and } as a scope delimiter.

For example:

int myfunc()
{
    int i = 4;

    {
        int j = 5;
        i = i + j;
        ...
    }
    ...
}

In this example the { and } create a new scope and so the j can't be seen outside of the { and }.

Does Kotlin supports this?

Upvotes: 2

Views: 165

Answers (2)

Egor
Egor

Reputation: 40193

Adding to @zsmb13's answer, you may look into scoping functions (Standard.kt). The idiomatic way of creating a scope in Kotlin would be:

var i = 0
run {
  i++
}
println(i)

Upvotes: 5

zsmb13
zsmb13

Reputation: 89548

It doesn't, because this syntax creates a lambda expression (which then isn't assigned to anything, and is never called).

So this code does nothing to the initial value of i:

var i = 0
{
    i++
}
println(i) // 0

You can however assign the lambda to a variable and call it:

var i = 0
val f: () -> Int = { 
    i++ 
}
f()
println(i) // 1

Or invoke it immediately in a JavaScript-ish style, which might be frowned upon by some people:

var i = 0
{
    i++
}()
println(i) // 1

Upvotes: 4

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